Life prediction for a structural material under cyclic loads with hold times using a viscoplastic constitutive model. Final report, 1 February 1983-31 January 1984
This investigation demonstrates the ability of the Chaboche viscoplastic constitutive theory to model the behavior of Ti-6Al-4V alloy at non-elevated temperature. The range of material behavior considered includes uniaxial monotonic stress-strain primary creep, stress relaxation, kinematic and isotropic hardening (and softening) under cyclic loading with and without hold times. The six materials parameters of the viscoplastic theory were evaluated from a series of strain-controlled stabilized cyclic loading tests, and room temperature primary creep tests. The viscoplastic strain calculations were integrated into a fatigue life prediction methodology for low cycle fatigue. Two sets of low cycle fatigue life predictions were carried out and compared with experimental data. One involved strain-controlled cyclic loading without hold times, and the other stress-controlled cyclic loading with hold times. Good agreement was found between predicted and actual results.
- Research Organization:
- George Washington Univ., Washington, DC (USA). School of Engineering and Applied Science
- OSTI ID:
- 5898492
- Report Number(s):
- AD-A-164082/0/XAB
- Country of Publication:
- United States
- Language:
- English
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