A damage mechanics approach to high temperature fatigue crack growth
Book
·
OSTI ID:191367
- Toyohashi Univ. of Technology (Japan). Dept. of Mechanical Engineering
A nonlocal damage constitutive model is developed for elasto-visco-plastic materials and is used to analyze fatigue crack growth at high temperature. In this model, no kinematic hardening rule is needed to account for the subsequent yielding and strain hardening behavior of the materials. A calculation method for nonlocal damage is introduced. The fatigue crack growth tests and the cyclic strain controlled fatigue tests are carried out at 723 K (450 C) on pure titanium. By means of FEM, the stress distribution near the crack tip, and the relationships between the crack growth rate dl/dN and some mechanical parameters, such as the crack tip opening displacement (CTOD), and the range of viscoplastic strain {Delta}{var_epsilon}{sub y}{sup vp} at the crack tip, are investigated. The mesh size dependence of these mechanical parameters in finite element analysis is discussed. The numerical results are given and compared with the experimental ones.
- OSTI ID:
- 191367
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1337-1
- Country of Publication:
- United States
- Language:
- English
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