Plastic creep ASTM D2990

The following description can be found in the ASTM page for the above Standard:

1. Scope

1.1 These test methods cover the determination of tensile and compressive creep and creep-rupture of plastics under specified environmental conditions (see 3.1.3).

1.2 While these test methods outline the use of three-point loading for measurement of creep in flexure, four-point loading (which is used less frequently) can also be used with the equipment and principles as outlined in Test Methods D790.

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 6.8.2.

Note 1 - This standard and ISO 899 are similar in content, but are not equivalent.

Keywords: creep; creep-rupture; chemical reactions; ICS Number Code 83.080.01


For additional details you may need the docuiment itself.

Regards,

Thanks, but I have that. I have been told by different labs that they start the curve matching from hour 10 up to hour 100. Seldom do they go back to time zero. My problem is that they don't have a standard way to report and interpret the data generated. By going to different starting points, you get different numbers at the 50 year data point. Then the other problem I see is that theses samples can be 400 to 800 hours old before the testing starts.

Richard A. Cornelius, P.E.