CB 3556-1993 General Specifications for Sound-Transparent Rubber for Underwater Acoustic Transducers CB3556-1993 Standard Download Decompression Password: www.bzxz.net

Shipbuilding Industry Standard of the People's Republic of China
CB3556-93
General Technical Conditions for Sound-Transmitting Rubber for Underwater Acoustic Transducers
Published in 1993-1108
China State Shipbuilding Corporation
Implementation on 1994-05-01
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General Technical Conditions for Sound-Transmitting Rubber for Underwater Acoustic Transducers 1 Subject content and scope of application
CB 355693
Classification number: U67
This standard specifies the performance requirements, test methods, inspection rules, etc. for sound-transmitting rubber for underwater acoustic transducers. This standard applies to sound-transmitting rubber used in underwater acoustic transducers. Sound-transmitting rubber for other purposes may refer to it for implementation. 2 Reference standards
GB1037
GB1682
GB1683
GB1690
GB1692
GB1694
GB1695
GB3512
GB5266
GB7762
HG4-854
3 Terminology
3.1 Sound-transmitting rubber
Determination method of tensile properties of vulcanized rubber
Determination method of tear strength of vulcanized rubber
Test method of Shore A hardness of rubber
Test method of density of vulcanized rubber||tt| |Test method for moisture permeability of plastics
Test method for brittle temperature of vulcanized rubber
Determination method for constant deformation compression permanent set of vulcanized rubberTest method for liquid resistance of vulcanized rubber
Determination method for insulation resistivity of vulcanized rubberDetermination method for high-frequency dielectric constant and dielectric loss tangent of vulcanized rubberDetermination method for power frequency breakdown dielectric strength and withstand voltage of vulcanized rubberTest method for hot air aging of vulcanized rubber
Measurement of longitudinal wave velocity and attenuation of hydroacoustic materialsPulse tube methodOzone aging test for vulcanized rubber
Static tensile test
Determination method for peeling strength between vulcanized rubber and metal [Rubber with acoustic characteristic impedance close to that of seawater medium and small attenuation coefficient. 3.2 Cavitation erosion
When cavitation bubbles in liquid burst, the wall near the cavitation bubbles is subjected to great impact force, resulting in erosion. 4 Technical requirements
4.1 General requirements
4.1.1 Appearance quality
The appearance of sound-transmitting rubber products should be smooth and flat, without surface defects, cracks and scratches. 4.1.2 Bubbles, stratification and impurities
The bubbles, stratification and impurities inside the sound-transmitting rubber should not affect its acoustic performance, and its indicators are specified by special technical requirements. China State Shipbuilding Corporation approved on November 8, 1993 and implemented on May 1, 1994
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4.2 Performance requirements
The performance of sound-transmitting rubber should meet the special technical requirements. 4.2.1 Density
4.2.2 Hardness
CB3556-93
The hardness of sound-permeable rubber shall include the hardness at room temperature, the hardness after low-temperature adjustment and the hardness after recovery at room temperature. 4.2.3 Breaking strength
4.2.4 Tensile strength
4.2.5 Elongation at break
4.2.6 Tear resistance
4.2.7 Compression deformation
4.2.8 Ozone resistance
4.2.9 Liquid resistance
4.2.10 Water permeability
Volume resistivity
The volume resistivity of sound-permeable rubber shall include the volume resistivity in air and the volume resistivity after immersion in artificial seawater. 4.2.12 Dielectric constant
The dielectric constant of sound-transmitting rubber shall include the dielectric constant in air and the dielectric constant after being immersed in artificial seawater. 4.2.13 Dielectric strength
The dielectric strength of sound-transmitting rubber shall include the dielectric strength in air and the dielectric strength after being immersed in artificial seawater. 4.2.14 Brittle temperature
4.2.15 Heat aging
4.2.16 Adhesion
Longitudinal wave speed and attenuation coefficient
4.2.18 [Acoustic impedance
Cavitation erosion
5 Test method
Determination of appearance quality of sound-transmitting rubber
The appearance quality of sound-transmitting rubber shall be determined by visual inspection or by the method specified in special technical requirements. Determination of bubbles, stratification and impurities
The determination of bubbles, stratification and impurities inside the sound-transmitting rubber is recommended to be carried out by ultrasonic scanning of each point of the uniform thickness sample according to the method recommended in Appendix A (reference), or it can be carried out according to the method specified in the special technical requirements. 5.3 Determination of density
The density of the sound-transmitting rubber shall be determined in accordance with GB533. Determination of hardness
5.4.1 The hardness of the sound-transmitting rubber shall be determined in accordance with GB531. 5.4.2 Place the hardness determination sample in 5.4.1 at 0±2℃ for 166±2h and then perform hardness determination in accordance with GB531. 5.4.3 Place the hardness determination sample in 5.4.2 back to room temperature for 72h and then perform hardness determination in accordance with GB531. 5.5
Determination of tensile strength
The tensile strength of the sound-transmitting rubber shall be determined in accordance with GB528. 5.6
Determination of tensile strength
The determination of tensile strength of sound-transmitting rubber shall be carried out in accordance with GB528. 2
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CB3556-93
The determination of elongation at break of sound-transmitting rubber shall be carried out in accordance with GB'528. 5.8 Determination of tear resistance
The determination of tear resistance of sound-transmitting rubber shall be carried out in accordance with GB530. 5.9 Determination of compression deformation
The determination of compression deformation of sound-transmitting rubber shall be carried out in accordance with GB1683. The measurement conditions are time 24°,h, temperature 70±1℃. 5.10 Determination of ozone resistance
The aging test of ozone resistance of sound-transmitting rubber shall be carried out in accordance with GB7762. The test conditions shall be specified in the special technical requirements. 5.11 Determination of liquid resistance
The test of liquid resistance of sound-transmitting rubber shall be carried out in accordance with GB1690. The test conditions are soaking in No. 1 standard oil at a temperature of 70±1℃ for 24~02sh
5.12 Determination of water permeability
The water permeability of sound-transmitting rubber shall be measured in accordance with GB1037. 5.13 Determination of volume resistivity
5.13.1 The volume resistivity of sound-transmitting rubber shall be measured in accordance with GB1692. 5:13.2 Soak the sample in 5.13.1 in artificial seawater at a temperature of 70±1℃ for 720±2h and then measure it in accordance with GB1692. The surface of the sample should be wiped dry and the measurement should be started after 5min. 5.14 Determination of dielectric constant
5.14.1 The dielectric constant of sound-transmitting rubber shall be determined in accordance with GB1694. 5.14.2 After the sample in 5.14.1 is immersed in artificial seawater at a temperature of 70±1℃ for 720±2h, it shall be determined in accordance with GB1694. The surface of the sample shall be wiped dry and the determination shall be started after 5min. 5.15 Determination of dielectric strength
5.15.1 The dielectric strength of sound-transmitting rubber shall be determined in accordance with GB1695. 5.15.2 After the sample in 5.15.1 is immersed in artificial seawater at a temperature of 70±1℃ for 720±2h, it shall be determined in accordance with GB1695. The surface of the sample shall be wiped dry and the determination shall be started after 5min. 5.16 Determination of brittle temperature
The brittle temperature of sound-transmitting rubber shall be determined in accordance with GB1682. 5.17 Determination of heat aging
The determination of heat aging performance of sound-transmitting rubber shall be carried out in accordance with GB3512. The determination conditions shall be in accordance with the special technical requirements. 5.18 Determination of adhesion
The determination of the combined force between sound-transmitting rubber and metal parts shall be carried out in accordance with HG4-854. The determination of adhesion with other material parts can be carried out with reference.
5.19 Determination of longitudinal wave velocity and attenuation coefficient The longitudinal wave velocity and attenuation coefficient of sound-transmitting rubber shall be carried out in accordance with GB5266 at audio frequency and the method recommended in Appendix A (reference) at ultrasonic frequency.
5.20 [Determination of acoustic characteristic impedance
The characteristic impedance of sound-transmitting rubber shall be calculated by multiplying the density determined in 5.3 and the sound velocity determined in 5.19. The ambient temperature for measuring the sound velocity shall also be given.
5.21 Determination of cavitation erosion
The determination of cavitation erosion of sound-transmitting rubber is recommended to be carried out according to the method recommended in Appendix B (reference). Standard information collector www.17bzW.cn Easy to start standard network provides free download of 100,000 standard books and information. Can type, 5 minutes fast self-service website www.17jzw.com Easy to start website building network provides free website building platform, commercial website 1 year only 60 yuan/izw.ne
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Inspection rules
CB3556-93
Inspection is divided into type inspection and factory inspection, and inspection is always carried out with samples. 6.1
Type test
6.1.1 Before the finalized formula of sound-permeable rubber is transferred to production, type test must be carried out before using new raw materials or raw materials whose storage period exceeds the specified time to produce sound-permeable rubber.
6.1.2 Type test includes all items in the technical requirements of Chapter 4. 6.2 Factory inspection
6.2.1 Factory inspection shall be carried out by the inspection department of the production unit. 6.2.2 Factory inspection items shall comply with special technical requirements. 7 Marking, packaging, transportation, storage
7.1 When sound-permeable rubber leaves the factory, it shall be packed in wooden boxes or cartons that ensure the quality of the rubber. 7.2 Each packaging box shall be attached with a label indicating: material number, weight, shipping unit, manufacturer name, and manufacturing date. 7.3 The packaging box shall be accompanied by a certificate of conformity, and shall be attached with the rubber batch number and material number, vulcanization conditions, quantity, test results, guaranteed storage period, technical standard number, manufacturer name, and manufacturing date. 7.4 Sound-permeable rubber should be stored in a warehouse with a temperature of 0-28℃ and a relative humidity of no more than 80%, avoiding direct sunlight. 7.5 Sound-permeable rubber should be placed at least 1m away from heat sources and at least 0.3m away from the ground. 7.6 Sound-permeable rubber should be protected from contact with oils, acids, alkalis and other substances harmful to rubber during storage. 7.7 Sound-permeable rubber should not be stored for more than six months under the above storage and preservation conditions, calculated from the date of manufacture. Sound-permeable rubber shall be shipped from the factory within one month from the date of manufacture.
7.8 If the sound-permeable rubber exceeds the storage and preservation period and the user re-inspects the performance and still meets the requirements specified in this standard, it can continue to be used, but it shall be re-inspected at least once a month.
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Appendix A
Ultrasonic measurement method of longitudinal wave speed and attenuation coefficient of sound-transmitting rubber
(reference)
This method is applicable to the determination of longitudinal wave speed and attenuation coefficient of sound-transmitting rubber. A1
The composition of the measuring equipment is shown in Figure A1:
Couple
CTS—Ultrasonic Detector
Transducer
(Transmitting)
Figure A1 Schematic diagram of ultrasonic measuring equipment
Couple
Transducer
(Receiving)
A2The transverse dimension of the sample should be larger than the transducer diameter d, the thickness should be uniform, and the surface should be flat. The thickness should not be less than 2./i0 (a is the wavelength corresponding to the working frequency).
A3Measuring method
a. Accurately measure the thickness of the sample and record the ambient temperature. b. Apply a thin layer of acoustic coupling agent (oil, grease or water) on the surface of the transmitting and receiving transducers to directly couple the two transducer surfaces. Adjust the amplitude and time base of the first wave of the receiving pulse according to the requirements of the instrument, and read the time t on the digital display of the instrument panel and the attenuation value a1 on the attenuator.
c. Insert a sample of thickness between the two transducers (Figure A1), adjust the receiving pulse amplitude to the same as the pulse amplitude before inserting the sample through the attenuator, and read the time t and the attenuation value a2od in the same way. Replace the sample between the two transducers with a sample of different thickness (preferably the thickness is a multiple of θ, such as 28, etc.), adjust the attenuation and time base in the same way as above, and record the time t and the attenuator value a3oe. Calculate the sound velocity according to formula (A1):
C=o/(t,-t.)
Where: C-
sound velocity of the sample, m/s;
thickness of the sample, m;
When there is no sample between the transmitting and receiving transducers, the reading on the digital display is S; when a sample of thickness is inserted between the transmitting and receiving transducers, the reading on the digital display is S. f. Calculate the insertion loss according to formula (A2)
I=(az-a)/
Where: I-
the acoustic insertion loss of the sample, dB;
the attenuator reading without sample between transducers, dB; the attenuator reading after inserting the sample between transducers, dB; - the thickness of the sample, m.
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g. Calculate the attenuation coefficient according to formula (A3):
CB 3556-93
—[sound] attenuator coefficient of the sample material, dB/m; where: α-
a2——attenuator reading after the transducer is inserted into a sample with a thickness of 8, dB; a
—attenuator reading after the transducer is inserted into a sample with a thickness of 8" (8\>3), dB; —thickness difference between the two insertions into the sample, m.
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Appendix B
Test method for cavitation erosion resistance of materials
(reference)
This method is recommended by the American Society for Testing and Materials (ASTM) and is used to test the cavitation erosion resistance of materials. B1 Equipment
The main equipment includes an ultrasonic transducer with a horn. An ultrasonic power generator and a monitoring instrument. The power of the generator is about 200W. The free end of the transducer horn is equipped with a short metal cylindrical vibration head to fix the test piece. Figure B1 is a schematic diagram of the equipment.
Signal source||tt| |(Audio frequency)
B2 Specimen
Transducer
Amplitude transformer
Vibration head
Figure B1 Schematic diagram of cavitation erosion test equipment
Monitor
The specimen should be a rubber sheet cut from a tensile test piece with a diameter larger than the vibration head. The surface of the test piece should be polished with an electric disk with fine sandpaper, using 99-200 fine sandpaper. The vibration head should be sandblasted. The test piece is then glued to the free end of the vibration head with a suitable adhesive. When the adhesive is cured, the edges of the test piece are trimmed and polished to the same diameter as the vibration head. B3 Method
a. Weigh the vibration head and test piece assembly b. Adjust the transducer height so that the vibration head sample assembly is immersed in the container of artificial seawater to a depth of about 8mm. Then adjust the excitation frequency to make the transducer resonate, and then increase the power to make the amplitude of the vibration head reach about 0.5mm. The temperature of the artificial seawater in the container is maintained at about 40℃. The test is carried out continuously for 10 hours. c. After the test, first check the degree of damage on the surface of the sample, such as the degree of perforation, sand holes, pits, hole size and degree of cracking. Then re-weigh the weight of the assembly W2. d. Measure and record the surface area A of the sample, and calculate the volume loss VL per unit exposed surface area according to formula (B,). Three samples should be tested to find the average volume loss.
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Where: V,-
CB3556-93
Volume loss of the sample per exposed surface area, m2/m2; -Weight of the sample before cavitation test, kg
-Weight of the sample after cavitation test, kg;
Density of the sample, kg/m3;
Surface area of ​​the sample, m2.
Additional notes:
This standard was proposed by the 603 Institute of China State Shipbuilding Corporation. This standard was drafted by the 715 Institute of the 7th Institute of China State Shipbuilding Corporation and the Tianjin Rubber Industry Research Institute. The participating units of this standard are the 721 and 612 factories of China State Shipbuilding Corporation. The main drafters of this standard are Miao Rongxing and Deng Mingchang. Standard information collector www.17bzW.cn Yiqi Standard Network provides free download of 100,000 standard books and information, can type, and quickly build a website in 5 minutes www.17jzw.com Yiqi website building network provides free website building platform, commercial website 1 year only 60 yuan
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