Abstract
The path independence of the T ̇ integral, which does not rely on either the constitutive relation of a material or the loading history, is applied to large scale creep. The relationship between the T ̇ integral and stress intensity factor has been deduced in linear creep, which clarifies the physical significance of the T ̇ integral. Furthermore, the T ̇ integral is interpreted as the variation of the strain energy rate during creep crack growth, providing the basis for the T ̇ integral to be a characteristic parameter for the creep crack growth process. The creep crack growth tests of 1Cr18Ni9Ti stainless steel were carried out at 293 K under different load levels and various crack lengths. The experimental results verified that the dependence of creep crack growth rate on the T ̇ integral is not affected by crack lengths and load levels. It was demonstrated that the T ̇ integral is an appropriate parameter to describe creep crack growth and the creep crack growth rate of this material was approximately proportional to the T ̇ integral.
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