ASTM D6068 J Integral Crack Growth Resistance Curves of Plastics

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ASTM D6068 covers the determination of the J-integral versus crack growth resistance (J-R) curves for polymeric materials. ASTM D6068 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 ASTM D6068.

A J-R curve can be used as an index of material toughness for blend or alloy design, material selection, materials processing, and quality assurance. ASTM D6068 describes a multiple specimen technique for determining the J-R curve for polymeric materials. The J-R curve consists of a plot of J versus crack extension in the region of J-controlled growth.

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