Significance and Use
5.1 Data from creep and creep-rupture tests are necessary to predict the creep modulus and strength of materials under long-term loads and to predict any dimensional changes that will potentially occur as a result of such loads.
5.2 Data from these test methods are suitable for use: (1) to compare materials, (2) in the design of fabricated parts, (3) to characterize plastics for long-term performance under constant load, and (4) under certain conditions, for specification purposes.
5.3 Before proceeding with this test method, reference shall be made to the specification of the material being tested. Any specimen preparation, conditioning, dimensions, and/or testing parameters covered in the material specification shall take precedence over those mentioned in this test method, except in cases where to do so would conflict with the purpose for conducting testing. If there are no material specifications, then the default conditions apply.
1.1 These test methods cover the determination of tensile and compressive creep and creep-rupture of plastics under specified environmental conditions (see ).
1.2 In these test methods three-point loading, as described in Test Methods , is used for measurement of creep in flexure. However, four-point loading using the equipment and principles described in is also permitted as an option.
1.3 For measurements of creep-rupture, tension is the preferred stress mode because for some ductile plastics rupture does not occur in flexure or compression.
1.4 Test data obtained by these test methods are relevant and appropriate for use in engineering design.
1.5 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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. A specific warning statement is given in .
Note 1: This standard and ISO 899 Parts 1 and 2 address the same subject matter, but differ in technical content (and results cannot be directly compared between the two test methods). ISO 899 Part 1 addresses tensile creep and creep to rupture and ISO 899 Part 2 addresses flexural creep. Compressive creep is not addressed in ISO 899.
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