GB/T 15016-1994 Terms and definitions of physical properties and quantities in the field of thermometallic materials GB/T15016-1994 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Physical characteristics and physicel valuesterms definitions for thermostatic himetalsGB/T 15016--94
Replaces GBn 282--88
This standard applies to the basic and commonly used physical characteristics and physical valuesterms and definitions in the basic theory and technology of thermostatic himetals1Thermostatic metal
A composite material composed of two or more metals or other materials with suitable properties, generally made into sheets or strips. The thermal expansion coefficients of each component layer are different. When the temperature changes, the curvature of this composite material changes. 2Component laminations
Any layer in the thermostatic himetals. 3 Thickness ratio of components
thieknesg ralio of components The ratio of the thickness of the component layer in the thermal bimetal to the total thickness of the thermal bimetal. This value is dimensionless.
4 Specific thermal deflection K
specific thermal deflection K When the temperature of a straight thermal bimetallic strip of unit thickness changes by 1°C, the curvature change of the center line of the bracket is half of the change. The expression of specific thermal deflection K is:
Where: K——Specific deflection ·\
—thickness of the thermal bimetallic strip, mml
t——temperature of the thermal bimetallic strip when it is straight, C, t——temperature of the thermal bimetallic strip when it is bent, ℃—radius of curvature of the thermal bimetallic strip when it is bent, mm. R
Unit name is per degree Celsius, and the unit symbol is \℃-". Approved by the State Administration of Sport on April 4, 1994 and implemented on May 1, 1994
5 Coefficient of deflection K
coefficient of deflection K'CB/T 15016-94
The thermobimetal strip with fixed ends is the variable of its unit length and free end deflection when the temperature changes by 1 (unit). The expression of the bending coefficient K\ is:
bending coefficient, -;
In the formula: K—
·. The thickness of the thermobimetal strip, mm;
I(t --)
L—the measuring length of the thermobimetal strip, mm; - the corresponding deflection of the thermobimetal strip at the initial measuring temperature t, mm; f
The corresponding deflection of the thermobimetal strip at the final measuring temperature: mm: a
The initial measuring temperature of the thermobimetal strip, C tThe final measurement temperature of the thermal bimetallic strip, ℃. ta
The unit name is per degree Celsius, and the unit symbol is C-6 Thermal curvature F
llexivityF
The curvature change of the longitudinal center line of a thermal bimetallic strip of unit thickness per unit temperature change. The expression of thermal curvature is:
Wherein:
Curvature, C-
Thickness of the thermal bimetallic strip,
Initial measurement temperature of the thermal bimetallic strip, r; Final measurement temperature of the thermal bimetallic strip, ℃, The radius of curvature of the longitudinal center line of the thermal bimetallic strip at the initial measurement temperature, mm; The radius of curvature of the longitudinal center line of the thermal bimetallic strip at the final measurement temperature, m1. The unit name is per degree Celsius, and the unit symbol is 1. 7 Sensitivity coefficient M
coefficient of sensitivity M is the difference in thermal expansion coefficient between the active layer and the passive layer of the thermal bimetallic strip. On a specific test device, the deflection angle of the spiral thermal bimetallic strip is measured. The sensitivity coefficient M is:
Where: M——Sensitivity coefficient, -1;
Le·Yuan·
M-270:142-4)
?——Deflection (loosening angle) of the spiral end, (\) or rad; -Thickness of the spiral thermal bimetallic strip, mm
L——Calculated length of the spiral thermal bimetallic strip, mm: -Initial measurement temperature of the spiral thermal bimetallic strip, (: GB/T 15016- 94 www.bzxz.net
——Final measurement temperature of the spiral thermal bimetallic strip, C. The unit name is degree per degree or degree per degree Celsius, and the unit symbol is rad/\ or (\)/C. 8 Nominal value of bending
nominal value of specifie thermal Deflection refers to the deflection ratio value within the range of room temperature to 130℃. Since the deflection ratio is not a constant, the curvature of the thermal bimetallic strip does not change linearly with the increase of temperature, but increases along the curve. Therefore, the applicable temperature range of deflection ratio must be indicated.
9 Modulus of elasticity E
modulus of elasticity E
is the ratio of stress to corresponding strain within the elastic limit of the material. The modulus of elasticity is measured by the cantilever deflection method under mechanical load. The calculation formula for the elastic modulus E is:
Where: E—elastic modulus, Pa or N/m
}\--load, N;
L,---sample test length, mm
Af-average value of deflection variable, mm:
6--sample width, mm:
a-sample thickness, mm,
The unit name is Pascal or Newton per square meter, the unit symbol is P or N/m10Allowable bending stress
allowable strenx of deflection refers to the mechanical stress that has not yet caused residual deformation. The unit name is Pascal or Newton per half meter, the unit symbol is Pa or N/tn. 11Linear temperature range
lincarity temperature ratgc
The actual carrying capacity of the thermometal is compared with the capacity calculated by the nominal bending value. The deviation does not exceed the temperature range of ±100%. 12Allowable temperature range
allowable tenuperalure thnige for serviceThe temperature range where the thermometal does not undergo residual deformation. 13Thermal deflection rate D
Thcrmal deflecion rate)
The ratio of the rotation angle to the temperature change, the thermal sensitivity of the spiral element. The expression of thermal deflection rate is:
Thermal deflection rate, radl/C or ()/:
_year
GB/1 15015---94
{----The initial measurement temperature of the thermal bimetallic strip, C; t2—The final measurement temperature of the thermal bimetallic strip (;-The angle corresponding to the thermal bimetallic strip at the initial measurement temperature t:, tad or (\)#-—The angle corresponding to the thermal bimetallic strip at the final measurement temperature t, ad or (\). The unit name is degree per degree Celsius or degree per degree Celsius, and the unit symbol is rad/C or ()/. 14 Mechanical torque rate
mcchanical torgue rate
Ratio of torque to deflection angle. Used to measure the rigidity of spiral elements, the unit is called Newton meter per radian or Newton water per degree, the unit symbol is N·m; Iact or N·m/(\), 15 Transverse curvature
cross curvature
The deviation of the hot bimetallic strip from the flat surface within the entire width range is measured in meters, the unit name is point meter, and the unit symbol is mm. Additional notes:
This standard is proposed by the Metallurgical Industry Ministry of Precision Standard Research Institute, and this standard is jointly drafted by Shanghai Iron and Steel Research Institute and the Metallurgical Industry Ministry of Information Standard Research Institute. This standard is graded
GR/T 15016—941
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