Multiaxial fatigue damage in metals. Final report
This review summarizes empirical trends and discusses available life prediction approaches. An evaluation of three of the more promising approaches for predicting multiaxial fatigue life is then presented. Evaluation of the approaches is based on the literature as well as tests of A533B pressure vessel steel. In these deflection-controlled tests, specimens were subjected to combined bending and torsion, applied both in-phase and 90/sup 0/ out-of-phase, at two different fixed ratios of applied torsional shear strain range to bending strain range, and at several strain ranges to produce lives between 10/sup 3/ and 10/sup 6/ cycles. The plastic work approach was superior to the others. Differences in crack formation and growth behavior with differences in the above test parameters are presented, and their significance discussed in terms of development of improved methods for predicting multiaxial fatigue life. A new theory for predicting crack propagation rates for complex multiaxial loading is subsequently developed. A procedure for estimating the J-integral for mixed mode cracking is developed.
- Research Organization:
- Stanford Univ., CA (USA). Dept. of Mechanical Engineering
- DOE Contract Number:
- AS03-81ER10999
- OSTI ID:
- 6325102
- Report Number(s):
- DOE/ER/10999-T1; ON: DE86004887
- Country of Publication:
- United States
- Language:
- English
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