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Fig. 8. Force applied to a trouser-tear test piece is plotted against distance of
test piece's extension. Arrow 1 indicates the specimen's initial extension,
arrow 2 indicates tearing of the test piece at average force F, and
arrow 3 indicates final retraction of the specimen as applied force is
removed. The stippled area in (A) depicts energy released in crack extension.
In (B), hatched area 1, under the initial extension curve (arrow 1), indicates
strain energy in legs before crack growth. Cross-hatched area 3, under the
retraction curve (arrow 3), indicates strain energy stored in legs at the end
of the test. Because legs are longer at the end of the test due to crack
extension, final stored strain energy (area 3) is greater than initial stored
strain energy (area 1).
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