Abstract
One of the important factors which should be considered in formulating fracturepropagation theories is the nature of energy dissipation at the crack tip, particularly, the fracture surface work (energy) dependence on crack velocity. In treating fracture propagation problems in polymeric materials, consideration of crack velocity and temperature influences on fracture surface work is essential since properties of polymers are strongly influenced by strain rate (crack velocity) and temperature, and in addition characteristic glass or glass—glass transition temperatures of polymers are much closer to testing or application temperatures than the melting or phase change temperatures of metals or ceramics.
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