Abstract
Warm prestressing of a cracked structure can result in an apparent elevation of its fracture toughness at lower temperature. In this paper, Chell's theory is re-examined, and it is found that the J e-integral defined by Chell should be reformulated. As a new control parameter the intergal J ̄ w is proposed to explain the warm prestressing phenomenon. By comparison with published warm prestressing data, the J ̄ w-integral is more available.
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