Application of the Chaboche viscoplastic constitutive theory to low-cycle fatigue-life prediction of smooth Ti-6Al-4V specimens
For room-temperature application, the six material parameters needed to completely specify the Chaboche viscoplastic constitutive equation for a Ti-6Al-4V alloy were determined from test data made available to this researcher from a test program performed at the University of Illinois, Urbana, although this test program was not specifically designed to determine these material parameters. The predictive characteristics of the constitutive theory were then examined for the Ti-6Al-4V alloy against the test data that was available. This includes uniaxial monotonic stress-strain, kinematic and isotropic hardening (softening) under cyclic loading, primary creep, and stress relaxation. Chaboche's viscoplastic constitutive theory was then employed (for the first time, to the best of this researcher's knowledge) for making low-cycle fatigue-life predictions of smooth Ti-6Al-4V test specimens, by incorporating the viscoplastic strain calculations into a fatigue-life prediction methodology. A computer program FATIQ, was developed especially for this purpose. Several fatigue-life predictions were also made for load cycles that included load hold times. Both sets of predictions are compared with experimental data.
- Research Organization:
- George Washington Univ., Washington, DC (USA)
- OSTI ID:
- 5526289
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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