ASTM D() – 橡胶/塑料/铁件 磨损率试验标准. ASTM D(). Standard Test Method for Wear Rate and Coefficient of Friction of Materials in Self-Lubricated Rubbing Contact Using. ASTM D(04) – Download as PDF File .pdf), Text File .txt) or read online.
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Coefficient of Friction ASTM D3702
A number in parentheses indicates the year of last reapproval. NOTE 1—This machine may also be used to measure coefficient of friction. It is the product of a restraining force and the radius at which it acts to balance the frictional torque. Summary of Test Method 3. Each test consists of break-in for 40 h followed by a selected test duration, each at the same selected normal load and speed.
Load is obtained by application of dead weights to the The contact area is 1. The mean rubbing velocity is related to spindle rotational speed: The user of this test method should determine to his own satisfaction whether the results of this test procedure correlate with?
If the test conditions are changed, the wear rates may change and the relative value of one material with respect to another may also change. It is generally believed that useful wear rate precision 1.
In cases where materials, products, or equipment are available only in inch-pound units, SI values in parentheses are for information only.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Current edition approved Oct. Originally approved in Last previous edition approved in as D—94 This manufacturer recommends a maximum test load of lb kg. Your comments will receive careful consideration at a meeting of the responsible technical committee,1 which you may attend. No further reproductions authorized.
Typical wear rates for some commonly used materials at different PV levels are: Acetal homopolymer at PV1: Acetal homopolymer at PV2: Polyamide Type at PV2: Test durations will often be in the 50 to h range. AA, the hardness Rc 20 6 5. Reagents and Materials 6. NOTE 2—Petroleum distillates, formerly used as solvents, have been eliminated due to possible toxic effects.
Coefficient of Friction ASTM D
Each user should select a solvent that can meet applicable safety requirements and thoroughly clean machine parts. Preparation of Apparatus 7.
NOTE 3—Remove all solvents from the washer before testing. It is recommended that clean cotton gloves or clean tweezers or tongs be used. NOTE 4—Check compatibility of the test specimen cleaning procedure and reagents with the speci? Refer to Table 1 to convert the speci? Torque the bolt to 6. NOTE 5—Calibrate torque meter such that the anticipated test torque is approximately two-thirds of calibration value.
NOTE 6—A chart recorder can be used to continuously record torque throughout the test. Mark the test specimen inside the raised test surface so subsequent measurements can be made at the same places. Subscripts 2a, 2b, 2c, and 2d are the corresponding? Test durations were h, except for round robin 1 where they ranged from to h. Wear in h round robins averaged 0.
Precision and Bias The lever arm may be balanced to compensate for the f3702 of the stationary washer. Optional controlled pneumatic loading systems are available to replace applications of dead weight.
Typical spindle speed range is 10 to asrm.
A built-in tachometer provides speed indication. An elapsed time indicator with reset feature to indicate motor running time should be included. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known e3702 the ASTM Committee on Standards, at the address shown below. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. D702 rights to photocopy the standard may also be secured from the ASTM website www.