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ASTM D6068 2010 Edition, July 1, 2010
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Standard Test Method for Determining J-R Curves of Plastic Materials
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This test method covers the determination of the J-integral versus crack growth resistance (J-R) curves for polymeric materials.

This test method is intended to characterize the slow, stable crack growth resistance of bend-type specimens in such a manner that it is geometry insensitive within limits set forth in this test method.

The recommended specimens are the three-point bend (SE (B)) and pin-loaded compact tension (C (T)) specimens. Both specimens have in-plane dimensions of constant proportionality for all sizes. Specimen configurations other than those recommended in this test method may require different procedures and validity requirements.

This test method describes a multiple specimen method that requires optical measurement of crack extension from fracture surfaces. It is not recommended for use with materials in which the crack front cannot be distinguished from additional deformation processes in advance of the crack tip.

The values stated in SI units are to be regarded as the standard.

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.

NOTE 1—There is no equivalent ISO standard.