Life Prediction for a Structural Material under Cyclic Loads with Hold Times Using a Viscoplastic Constitutive Model.
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1984
- Accession Number
- ADA164082
Entities
People
- D. L. Jones
- J. Eftis
Organizations
- George Washington University