Probabilistic mesomechanical fatigue crack initiation model: Phase 1 -- Crack nucleation
Book
·
OSTI ID:122627
- Vanderbilt Univ., Nashville, TN (United States). Mechanical Engineering Dept.
Ever increasing demands are requiring higher and higher reliability of structures and components. Most empirical fatigue crack initiation models are based on simple macrostructural variables which do not account for the microstructural inhomogeneity that governs the growth of small cracks. However, theoretical micromechanical crack initiation models which explicitly relate the microstructure to the macroresponse have not been developed because too many complex micromechanical processes are operating simultaneously. In this paper, a probabilistic mesomechanical crack nucleation model is proposed to predict the macrostructural response. This model draws on models developed in the microdomain and defines the microelements with statistical parameters. Persistent slip bands are essential to fatigue damage and must be addressed by crack nucleation models. A micromechanical slip band decohesion model along with a Paris law crack growth model are used with first order reliability methods and Monte Carlo simulation to determine the distribution of fatigue life for a macrostructure. The model is compared to experimental observations.
- OSTI ID:
- 122627
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1335-5
- Country of Publication:
- United States
- Language:
- English
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