This standard defines the commonly used terms in tribology and their definitions or definitional statements. This standard applies to the compilation and translation of technical standards, technical documents, teaching materials, books and periodicals in tribology and related fields, as well as scientific research, application, teaching and academic exchanges in tribology. GB/T 17754-1999 Tribology Terminology GB/T17754-1999 Standard download decompression password: www.bzxz.net
This standard defines the commonly used terms in tribology and their definitions or definitional statements. This standard applies to the compilation and translation of technical standards, technical documents, teaching materials, books and periodicals in tribology and related fields, as well as scientific research, application, teaching and academic exchanges in tribology.

GR/T 17754—1999
This standard is formulated according to the national standard formulation plan of "Tribology Terminology" issued by the State Technical Supervision Bureau (1996J32 document). The purpose of this standard is to standardize the basic tribology terms in my country and their English equivalents, coordinate and unify the concepts referred to by each term, and make them consistent with the standards or customary usage of developed countries in the world, so as to adapt to the increasingly extensive academic exchanges and domestic popularization of tribology between my country and foreign countries, and meet the needs of the rapid development of tribology research and application. This standard incorporates the terms in the relevant terminology standards of the International Organization for Standardization (ISS) and the American Association for Testing and Materials (ASTM), and also absorbs some terms in the "Compilation of Tribology Terms and Definitions compiled in the early stage of the Organization for Economic Cooperation and Development (OECD)". This standard focuses on the development and evolution of tribology terminology, and tries to establish new terms and update the definitions of some old terms from recent publications related to tribology.
In addition to the first chapter "Scope", the terminology content of this standard is divided into 10 chapters, including 812 terms in the fields of solid surface and its contact, friction, wear, erosion, lubrication, lubricants, tribological materials and tribological tests. Tribology is a marginal subject, involving a wide range of fields and developing rapidly. As the first national standard for the terminology of this subject, there are some imperfections. It is planned to be revised after a period of trial implementation: Appendix A, Appendix I3 and Appendix C of this standard are all informative appendices. This standard is proposed and managed by the Chinese Academy of Sciences. The drafting unit of this standard is: Institute of Metal Research, Chinese Academy of Sciences. The main drafter of this standard is Dong Yanglin.
wm1 Scope
National Standard of the People's Republic of China
Tribology terminology
Tribology terminology
This standard defines the commonly used tribology terms and their definitions or semantic explanations. GB/T17754—1999
This standard is used for the compilation and translation of technical standards, technical documents, teaching materials and books in tribology and related fields, as well as scientific research, application, teaching and academic exchanges in tribology.
2 General terms
21 Friction The science and technology of surfaces in relative motion, including friction, lubrication, wear and erosion. Note: Friction is called "tribbology" in Taiwan Province of my country. 2.2 Friction The phenomenon of two objects in contact and moving relative to each other under the action of external forces. 2-3 Lubrication The measure of adding a substance between the surfaces to reduce friction and wear. 2.4 Wear: Attrition The continuous loss of the solid contact surface when the surface and the object in contact with it move relative to each other, resulting in deformation or other damage.
2.5 Erosion wcar Solid surface is caused by mechanical interaction with fluid, elementary fluid (i.e. fluid containing solid particles or liquid droplets), liquid droplets or solid particles, resulting in continuous loss or other damage to the surface material. 2.6 Friction physics ttibophysies
The science and technology that studies the relationship between the interaction between the contact surfaces of relatively moving objects and the physical phenomena of solid surfaces and interfaces. 2.7 Tribochemistry Itiborebemisiry
The science and technology that studies the chemical and physical changes of substances under the action of mechanical energy (friction or impact): 2.8 Tribological mechanics
The science and technology that studies the microscopic and microscopic processes of the interaction between the contact surface forces of relatively moving objects on the solid surface and interface during friction.
meigllribology
2. 9 Metal tribology
The science and technology of the interaction of metal surfaces in relative motion. 2.0 Ceramic tribology
The science and technology of the interaction of ceramic surfaces in relative motion. 2.11 Plastic tribologyThe science and technology of the interaction of plastic surfaces in relative motion. 2.12 Biotribology
Approved by the State Administration of Quality Supervision, Inspection and Quarantine on May 19, 1999, and implemented on December 1, 1990
GB/T 177541999
The science and technology of studying the surfaces of organisms (such as human joints or artificial joints) in relative motion and interaction: 2.13 Microtribolagy The science and technology of studying the interaction between two relatively moving surfaces from the molecular or nanoscale under ultra-micro load (nV level), extremely small contact area and micro-smoothing film conditions: its goal is to achieve zero wear. 2.14 Nanotribolugy
The science and technology of studying the interaction between nanostructured surfaces or nanocrystalline material surfaces in relative motion, its research object, research method, research goal and microtribology are the same. See microtribology, 5. Mulecularirilalrgy
The science and technology of studying the interaction between two relatively moving surfaces from the molecular scale and molecular resistance, its research object, research method and research goal are the same as microtribology. See microtribology. 2.16 Syatematic triboingy Syatematic triboingy Use a systematic view to study and deal with tribological problems, that is, it is believed that the tribological properties of materials are not inherent characteristics of the materials, but the physical properties of the entire system (including various influencing factors): 2.17 Tribological design Triholagy design In mechanical design, use tribological knowledge and known data to systematically analyze all factors, so as to optimize the design of parts material selection, structural size, processing, lubrication conditions, etc., so as to achieve the design method of low energy consumption, minimum maintenance cost and longest service life of the tribological system.
3 Solid surfaces and their contacts 3.1 Nascen: strlare, virgin surface virgin surface 3.2 Purified surface denuded surfaee
The surface that has been cleared by the most effective method (such as vacuum evaporation, ion bombardment, etc.): 3.3 Subsurface
The part of the solid surface that is close to the surface, but has no clear size definition. 3.4 Overlap coefficient caefficient nf mutual uvcrlaFThe ratio of the smaller friction surface area of ​​two rubbing objects to the larger friction surface area: 3.5 Surface profile surface μrofile
The moving line obtained by the intersection of the plane perpendicular to the surface and the measured surface in the measurement of surface geometry 3.6 Surface topography anrfacc Surface texture: surface texture The microscopic geometry of a solid surface, especially the microscopic variations along the vertical height. 3.7 (surface) roughness: The degree of surface microscopic geometric features composed of small peaks and valleys on the solid surface. Its size is generally determined by the processing method and other factors.
3.8 original surface texture
prmary icxturt
microscopic geometry formed by the normal action of the machining tool on the surface during cutting. 3.9 surface waviness: the periodic ups and downs formed on the surface of the part mainly due to the vibration of the machine-tool-tool-workpiece system during cutting.
3.10 secondary surface texture 3.11 Surface finish surfacefinish
Another way to express surface roughness, since light activity is from the perspective of human vision, surface roughness is from the perspective of geometric error, so the latter is more objective.
3.12 Micro-asperities
Small irregularities on the surface,
GB/T 17754--1999
3.13 Radius of curvature of asperity The radius of curvature of the top of the micro-asperity.
3.14 Base surface refractive index A given surface used to assess the roughness parameters of a surface. It has the shape of a geometric surface (ideal surface), its orientation is consistent with the actual surface in space, and can be determined by mathematical methods (such as the least square method). 3.15 Reference line refractive index A given line used to assess the roughness parameters of a surface. Note: This line is not defined on a single surface.
3.16 Sampling length 1.sampling length 1. The length of the reference line used to measure the roughness characteristics of a surface material. Its value is selected according to the roughness height or roughness level. Profile deviation Y
The distance between a point on the surface profile and the reference line. Centre rithnetical mean line of the profile In roughness measurement, the base line that divides the profile so that the sum of the squares of the deviations of the points on the profile line from the line is minimized within the sampling length. Note: Abbreviated as centre line, 3. 19 Centre rithnetical mean line of the profile In roughness measurement, the base line that is consistent with the wheel direction within the sampling length, and the profile is divided by this line so that the areas on both sides are equal.
Note: The mean line is approximately the least squares line. 3.20
A straight line passing through the highest point of the profile and parallel to the lower reference line within the sampling length. 3.21 Profile valley bottom line tprofile valleys A straight line passing through the lowest point of the fan and parallel to the reference within the sampling length. 3.22
The distance between the midline and the highest point of the profile peak. 3.23 Profile valley depth Y. 3.24
The maximum height of the profile R, maximum peak in unevenness height R. The distance between the top line of the profile and the bottom line of the valley within the sampling length, 3.25 The ten-point height of micro-roughness R, terpuin!heightofirregularitienR The sum of the average values ​​of the maximum peak heights and the maximum valley depths of the profile within the sampling length R.
In the formula, Y.一一(maximum profile peak height: 一一(maximum profile depth): 3.26 Wheel arithmetic mean deviation R, the arithmetic mean value of the absolute value of the profile deviation (F) within the sampling length (1): R, is approximately: Y() dr, GB/T 177541999. 3.27 Wheel root mean square deviation R, the root mean sequence value of the profile deviation (Y) within the sampling length (L) R, 3.28 Profile support length naProfile bcaring lcngthrel
The sum of the lengths of the sections obtained by the line parallel to the center line intersecting the profile within the sample length. 3.29 Profile bearing length ratio tHrofile bearing length ratio tThe ratio of the profile bearing length (Shao) to the sampling length (1.). f
t.is the value corresponding to different horizontal distances (C). 3.30 Profile bearing length ratio curvecurve uf thc prufile bearing length ralio is a curve representing the relationship between the contour support length ratio and the contour horizontal intercept. 3.31 Contour horizontal intercept CprsfilesecuionlevelC The distance between the contour peak line and the cutting line parallel to it and intersecting the contour line, which can be expressed in micrometers or as a fraction of the maximum contour height.
3.32 Adsorption
The phenomenon that foreign atoms, molecules or ions from the environment are adsorbed on the surface of a body by chemical or chemical reactions. 3.33 Physical adsorption μphysical adsorptiun The molecular components are adsorbed on the solid body by the help of van der Waals forces. 3.34 Chemical adsorption chemical adsorptiun The components or atoms are attached to the surface of a body by chemical reactions (similar to chemical reactions). 3.35 Desorption; desorption
The process opposite to the adsorption.
3.36 Mechanical activation mechanical ... ArtivatinnUse mechanical methods to increase or decrease the activity of a solid surface, thereby promoting chemical reactions. 3.37
Rehbindcr eflcctThe phenomenon that the mechanical properties of a solid surface or near the surface change due to the interaction between a solid and a surface activator. 3.39 Russell effectRusseil ffue1The phenomenon that a newly deformed or broken surface releases electrons: these electrons are called exogenous electrons. 3.40 Surface filmsurlace lilmi
The oxide film formed on the surface of a rubbing, adsorption film or chemical film. 3.41 Oxide filmoxide:Tlm
The film formed by the reaction of a metal surface with oxygen in the atmosphere. 3.42 Adsorption filmadsorbate film
Surface film formed on the surface of a solid due to physical absorption of anions or chemical absorption of enzymes. 3.43 Polluted film
GB/T 17754—1999
Disordered impurities attached to the surface of a solid due to environmental pollution. 3.44 Monolayer
Surface film with a thickness equivalent to that of a molecule. 3.45 Beilby layer
When a product is mechanically irradiated, a deformed layer composed of non-product materials is formed on its surface. Note: It was proposed and speculated by the early old scholar, E. Bcilb. Recent studies have confirmed that this layer does not exist, so this term should be abandoned and no longer used.
3.46 Deformation layer
The strain hardening layer formed by mechanical irradiation and friction under the surface layer is divided into heavy deformation layer and light deformation layer, with a total thickness of several micrometers.
3.47 Film strength sttength
The ability of a surface film to resist damage by micro-melting or deformation. 3.48 Glaze
The ceramic surface or other hard and smooth surface film formed during friction (especially at high temperature). 3.49 Glazing
The effect and process of forming a glaze.
3.50 Contact area area of ​​contact1
The area between two solid contact surfaces, divided into nominal contact area, apparent contact area and real contact area. See the relevant clauses. Note: It is recommended to specify which area is used when applying. 3.51 Nominal contact area A, non-nominal contact A, apparent contact area appateuareaufcuituct The area between two solid contact surfaces determined by the contact boundary. 3.52 Contact area Acontourareuuf contactA is the sum of the areas formed by the flattened parts of the peaks of the two solid contact surfaces. The real contact area is within the contour contact area. See real contact area.
3.53 Real contact area-1, real area rf ccm16ctA. The sum of the areas formed by the flattened parts of the tops of the micro-convex bodies on the contact surfaces of the two solids, that is, the area of ​​the real transfer load 3.54 Relative contact area relative Cotact area The ratio of the real contact area to the nominal contact area: 3. 55 Hertzian contact area Ah Ilertzian contact area Al. The contact area of ​​two non-conformal contacting solids under load is calculated according to the Hertzian elastic deformation range. 3.56Contact point coctpo1
The unit of the real contact area, i.e. the point where two objects are in real contact, static contact staticcontact
The contact between two objects without relative motion under normal load, 3.58Elastic contactelasticcanract
The real contact area of ​​the micro-body on the two solid surfaces is in the state of elastic deformation. 3.59Plastic contactplasticcontaet
The real contact area of ​​the convex body on the two solid surfaces is in the state of plastic deformation, 3.60Elasto-plastic contactelastoplastirrantaclThe contact area of ​​two solids is in elastic contact and the other part is in the state of plastic fusion, 3.61Contact angle
The angle between the line of the droplet and the solid surface on which it is located. 3.62Conformal surfacesGB/T 17754-.-1999
Conformal surfaces whose center of curvature is located at the interface. 3.63 Non-canfornial surfacres; rounderformal surfacs Two contact surfaces with the center of curvature located on either side of the interface. 3.64 Contact resistance The resistance between two contacting objects, which is the sum of concentrated resistance and film resistance 3.65
Concentrated current Constrictirn resistance The current generated by the tiny contact between two contacting objects due to current concentration 3.66
Film resistance Film resistantc
The resistance generated by the film (such as oxide film or contamination film) on the surfaces of two contacting objects, contact forcebZxz.net
The force exerted on the deformation zone of the solid contact surface. 3.68
Contour pressure Contour pressure Pressure on the nominal contact area.
Hertzian contact pressureHertzian contact pressureContact pressure calculated according to the elastic deformation equation3.70 Contact stresscontact stressStress generated on and below the contact surface of a solid3.71
Traction stresstrective stress
Tangential stress transmitted through the interface in rolling contactResidual stressresidual stress
Stress remaining inside a solid after removing external forcesNote: Residual stress is generated by machining, heat treatment and friction3.73 Stress concentrationstressconcentrationLocal high stress occurring at the place where the dimensions of the cut surface of a part change or at the place where the friction surface layer has no regular defects.3.74 Stress concentration factor[in-] s1tt-sh cnncrniralion JaclorRatio of local high stress to average point force. 3.75
5 tractive force
the sum of the tangential stresses on the contact surface,
nominal unit load3.76
normal load on the nominal contact area3. 77
real unit loadreal unit lcad
normal load on the real contact area. 3.78
3 surface temperaturesurlace lenperalurehalf-mean temperature of the friction surface.
ash temperatureash temperatiure
the instantaneous maximum temperature generated at some contact points when two objects move relative to each other. 3. B0 thermal conductivitythermal conductiviryperformance of the material's friction heat transfer rate3.81
defarmed anisotropycharacteristics of the physical and mechanical properties of a solid produced in different directions due to friction deformation. Mechanical property gradient gradient nf merhaniral p:uperty Parameters of mechanical properties of friction pair materials (such as hardness, toughness, etc.) changing along the normal force of the friction surface 3-83 Microscopic section nicseclinl
GB/T 17754—1999
A section cut perpendicular to the surface of the sample under study, used for microscopic inspection. 3.84 Tapcr acction
A section cut obliquely from the surface, which allows the section to be magnified for microscopic inspection. 3. B5 Metallurgical compatibility In metallurgy, a measure of the evaluation of the compatibility of two solid metals. 3.86 Optimum roughness Surface roughness that ensures the most effective running-in and maximum wear resistance of the friction pair, or the best sealing performance. 3.87 Synthetic roughnessg The square root of the mean deviation of the contours of the two surfaces of a friction pair, V+: Synthetic roughness is often used in the calculation of fluid slip = 4 friction
4.1 Friction pair Tubbhing uair
A system composed of two objects in contact with each other and in motion: 4.2 Friction surface tribvsrfaee
Any solid surface in contact with another surface in motion or subjected to impact or cavitation. 4.3 Friction component ribcelemenm
One of two or more solids that slide, roll or contact with abrasive particles, or an object subjected to impact or cavitation. Each friction component contains one or more friction surfaces. Note: The friction element of the friction wheel can be a direct contact or a component of a friction wheel, such as a hydride or other agent that affects its friction. 4.4 Tribosystem; tribologicalsystem is a system consisting of one or more tribosystems, including all mechanical, chemical and environmental elements involved in tribology, see friction components. 4.5 Surfactofutuul rubbingwear: the surfaces of two objects rubbing against each other. 4.6 Optimum rubbing pair: the friction pair that has the best tribological properties under a wide range of conditions. Sliding: the tangential motion of two surfaces in different directions (or in different degrees). 4.8 Macroslip: overall relative xlip: the motion of all points of the contacting surfaces in a direction parallel to the other surface. 4.9 Pre-displacement: complianccThe microscopic displacement of two contacting objects before they are subjected to force and produce motion or rolling. 4.10 Micro sliding: The microscopic and tangential displacement that occurs locally in the contact area of ​​the friction pair interface. At this time, the rest of the interface in the hot contact area is still relatively static.
b) In railway engineering, end slip refers to the difference between the forward speed (V) of the vehicle and the peripheral speed (rm) of the vehicle: it is indispensable for the transmission of traction force by deformation at the wheel-rail contact point. 4.11 Rolling
The relative motion of the surface velocities on the contact surface of the friction pair in magnitude and direction that are at least slightly the same. 4.12 Combination sliding and rolling: The relative motion of the contact surfaces of objects that produce motion and rolling. 4.13
B Spin
GB/T 177541999
The relative motion of two contacting objects around the normal of their contact surfaces. 4.14 reciprocating sliding shidling sliding with periodic change of direction and parallel to the interface. 4.15 fretting
reciprocating tangential motion of a small distance between two solid contact surfaces. 1 Fretting refers only to a kind of motion without any damage or other damage: 2 The word fretting used to refer to damage caused by fretting, such as fretting erosion, etc., but this usage is not recommended because it can easily cause serious damage. 4.16 fretting amplitude fretting frequency fretting frequency
the number of fretting cycles per second.
B sliding velocity sliding velocity
the speed difference between the contact points when two surfaces slide, 4.19 rolling velocity rolling velocity the peripheral speed of a rolling object.
4.20 Sliding rate specific sliding
The ratio of the algebraic difference of the surface velocities of two relatively moving solids to their algebraic sum. 4. 21
Creeping rate creeping rate
The ratio of the sliding velocity to the rolling velocity, usually expressed as a percentage. Slip decay rate shiding-rpling rate rntio
The ratio of the sliding velocity to the rolling velocity. P value (pressure velocity limit) pV factai
The product of the pressure (P) and the surface velocity (tr/) between the friction pairs. 4.24 PV limit (pressure velocity limit) PV limit The maximum PV value allowed between the friction pairs. Note: PV limit is often used to evaluate the performance of non-fluid-lubricated bearings. 4.25
Sliding friction
Friction when the contact surfaces of two objects slide or tend to slide. 4.26 Rolling friction
Friction when the contact surfaces of two objects roll or tend to move. Sliding friction combined sliding end ralling friction4. 27
Friction when two objects are in contact and slide and roll at the same time, 4.28
Spin friction
Friction when two contacting objects rotate relative to each other about the normal of their contact surfacesStatic frictionstatic. trictian
Friction when the contact surfaces of two objects are subjected to external forces and produce pre-displacement but have not yet started macroscopic relative motion, limiting maximum static frictionlinilingaxitnstaifrictiot4 30
Static friction at the moment before the relative motion starts, 4. 31
Dynamic frictiondynamic friction
Friction between two surfaces in relative motion.
2 Internal friction internal friction 4. 32
GB/T 17754 1999
Friction caused by the internal parts of an object and the displacement of the object. 4.33 Lubrication friction lubrication friction friction between two solid surfaces without any lubricant between them. 4.34 Fluid friction fluid friction friction caused by the viscosity of the fluid or the rheological properties of the fluid. Boundary friction baundary friction friction between two solid bodies in relative motion separated by a fluid layer with no volume characteristics, i.e., friction in the state of boundary lubrication. 4.36 Mixed friction mixcd frictian friction friction caused by fluid friction and boundary friction (or dry friction) or friction caused by boundary friction and friction at the same time. 4.37 dry friction friction
Friction between surfaces in which no other medium is present. Often used to denote the absence of lubrication in terms of terms: 4.38
Unlubrirated frictionFriction without lubrication but not necessarily completely dry. Note: in practice, unlubricated friction and unlubricated friction are often confused. 4.39
Coulomb frictionCaulomb friction
Friction proportional to the normal load. See Amonton's law, Coulomb's law, 4.40Friction force
The tangential force that opposes the relative motion of two bodies in contact when one is in tangential motion or has a tendency to move in opposite directions. Static frictionStatie friction 4.41
The friction force when two objects in contact with each other have a tendency to move relative to each other under the action of an external force, but have not yet started relative motion.
Maximum limit, static friction forcemaxiinumtlinitingJstatit: friction force when two objects in contact with each other start relative motion under the action of an external force4.43Dynamic friction forcedyiiniericionfareFriction force when two objects are in relative motion
Molecular component of frictionmoletuJar cwmponent ffritiun fore4.44
Friction caused by the interaction of atoms when the surfaces of objects approach and move against each other: mechanical component of frictionmcrhanical componentotrictionforce4.45
Friction force caused by the mutual meshing of surface roughness points and deformation of the surface layer. SCoefficient of frictionu.()）coefficieni of iriction M+(f), Dynamic friction factorpt.(f）dynamic friction factor p,4. 46
The ratio of the friction force (F) of a sliding object to the normal force (), that is, F
4.47 Static friction coefficient μ(f,)staliccoefficieni of friction, (f.); static friction factor + (f)sialir irittionfartotr u.,cr.)
The maximum ratio of the friction force of a stationary object to the normal force, 4.48 Rolling friction coefficient u. (/) rolling friction coefficient p., (1, rolling friction factor μr, the ratio of the driving force of a rolling object to the normal force (A), that is, AFR
α-NN
Where: f-
GB/T 17754 -1999
Driving force through the center of rolling;
radius of the rolling body,
1 Coefficient of friction equals length of steel
2 The coefficient of friction is also called rolling friction:
t Siztic friction coefficient of braking4.49
Static friction coefficient of braking
Friction coefficient at the moment when the relative sliding speed of the friction pair reaches zero during braking: 4. 50 Viscosity coefficient (1) cefficien: uf adhesian 1) The ratio of the lateral force required to separate two surfaces with different viscosity from the normal force applied to make them contact and cause adhesion. 4.51
Adhesion coefficient (2) adhesion coefficient of adhesion (traction coefficient) In railway engineering, the adhesion coefficient is defined as the ratio of adhesion (or force) to the load. The angle of friction is called the friction angle, i.e. fmx tgyt
. In the formula: fmx tgyt
is the friction angle;
is the maximum static friction coefficient.
Note: When the angle is reduced, the body will remain static. This phenomenon is called "locking". 4.53 Friction cone re rf 「riciun
The chain plane with the normal line of the object's supporting surface as the symmetry axis and the semi-vertex angle as the friction angle Note: As long as the line of action of the square is within the Kunai Co, the object remains stationary. This phenomenon is called "self-locking". 4.54
Friction transmission frictinnd:ivc
Use the friction between objects to transmit motion or movement. Such as friction wheels, clutches, pulleys, etc. The functions and properties of friction transmission. 5 Amonton's law Armann'law
In 1599, Amonton proposed two friction laws: a) The friction force is proportional to the normal force; ||t 1) The pulling force has nothing to do with the small contact area of ​​the two objects, that is, F=N
, where: - friction;
N. Normal force:
_--friction coefficient.
Coulomb's law Cruloml: law
is also known as Amonton's law.
! In 1781, Coulomb proposed Amonton's law and pointed out that: the friction between the two objects is lower than the static friction, and the friction between the two objects is almost the same. This principle is sometimes used to describe the relationship between the friction between the two objects.
2. Morin's law is sometimes called Amonton-Coulomb law. Morin's laws
is also known as Amonton's law:
Note: Morin proposed Coulomb's law again in 1833. 4.58 Friction reduction property The property of a material to maintain a low friction coefficient during the friction process. 9 Friction self-locking property The state in which the friction resistance is sufficient to prevent macroscopic wear. See friction angle, CB/T17754—1999. 4.60 Friction vibration Relaxation vibration The vibration caused by the decrease of the friction coefficient of the friction system as the speed of the fingers increases. 4.61 Slick-slip The phenomenon that the friction force and relative speed of the friction pair fluctuate cyclically during the movement. It is usually related to the elasticity of the friction system and the relaxation vibration caused by the decrease of the friction coefficient when the sliding starts or the speed increases. 4.62 Friction heat Friction heat Heat generated during the friction process. 3 Friction heat pulse 4. 63
Thermal fluctuations during the operation of friction devices (such as brakes, clutches, etc.) with unstable friction: 4. 64
Friction sublimatin
The phenomenon that the surface of a material changes directly from solid to gas due to friction. 5Trihocracking
The decomposition process of high-boiling-point petroleum products under the action of frictional heat. Friction polymerizer
The organic sediment generated by the polymerization of the medium caused by friction. Friction noise:
The interaction of friction pairs, the noise caused by friction, vibration
The phenomenon that friction pairs produce vibration and noise during work: 4.69 Friction power
The product of friction force and its relative motion displacement in the same direction. Friction power
The product of friction force and its relative motion speed in the same direction. Friction torque M frictional torque M;friction torque4. 71
a) In the rotating friction body, the product of the friction force of the outer diameter of the rotating body and its radius h) In the friction clutch and brake, the force generated by the friction force is short (A), expressed by the following formula: M-pAZR.
: "Friction coefficient:
Wu Zhong! "
Contact pressure:
The contact area of ​​a friction surface;
Number of friction surfaces;
Effective radius.
4. 72 Friction torque stability coefficientccel[icien af ​​friction:tion tmmem alilityThe ratio of the average friction torque of the friction pair to the maximum friction torque,4.73
Coefficient of friction torque passivenesscocfficitnt of friction nument wsillatinThe ratio of the minimum friction torque of the friction pair to the maximum friction torque. Brake efficiencybrakeefficiency
The ratio of braking force to the applied force,
Loss of brake efficiencyLoss of brakeefficiency4.75
Efficiency loss caused by the decrease of friction coefficient due to heat during the use of brake friction:4.76 Braking ratebhrr.king raitic
The ratio of brake speed to the acceleration due to gravity. Braking capacity hrakc capeciy
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