Cracks in materials with hyperbolic-sine-law creep behavior
At high stress levels the creep strain rate for many materials varies as the exponential of stress while at low stress levels it varies as stress to some power. An analysis is presented for a stationary crack under antiplane shear or Mode III loading in a laterial that deforms both elastically and by hyperbolic-sine-law creep, epsilon /SUP c/ ..cap alpha.. (sinh sigma/sigma/sub 0/( /SUP n/ . The asymptotic crack-tip stress intensification is weaker and the strainrate intensification is stronger than for a power-law creeping material. The elastic stressintensity factor K /SUB III/ (for low applied loads) and the path-independent integral C are shown to be the relevant short-time (small-scale yielding) and long-time (extensive creep) loading parameters as in the power-law case.
- Research Organization:
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA
- OSTI ID:
- 6360083
- Report Number(s):
- CONF-8110313-
- Journal Information:
- Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States), Journal Name: Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States) Vol. STP-803; ISSN ASTTA
- Country of Publication:
- United States
- Language:
- English
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