SEDL / STP / STP924-EB / STP23219S

A Critical Comparison of Proposed Parameters for High-Strain Fatigue Crack Growth

Brown, MW
Lecturer, senior research fellow, and professor, University of Sheffield, Sheffield,

de los Rios, ER
Lecturer, senior research fellow, and professor, University of Sheffield, Sheffield,

Miller, KJ
Lecturer, senior research fellow, and professor, University of Sheffield, Sheffield,

Pages: 27    Published: Jan 1988

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Abstract

A number of elastic-plastic fracture mechanics parameters have been suggested for the description of fatigue crack growth, of which three are considered in this paper: the J-integral, crack-tip opening displacement, and plastic zone size. A critical comparison of the effectiveness of each parameter may be devised from a study of Mode I fatigue crack growth rates under various states of biaxial stress. Data for one heat of AISI 316 austenitic stainless steel at 20°C and 550°C showed that, if crack closure is taken into account, the cyclic plastic zone size is the most suitable correlating parameter for stress levels up to the yield value. A second heat of 316 stainless steel showed a preference for crack opening displacement control of crack growth. The analysis is based on the Dugdale model for crack-tip plasticity.