A Probabilistic Micromechanical Code for Predicting Fatigue Life Variability: Model Development and Application

Author:

Chan K. S.12,Enright M. P.2

Affiliation:

1. ASME Fellow

2. Southwest Research Institute ®, 6220 Culebra Road, San Antonio, TX 78238

Abstract

This paper summarizes the development of a probabilistic micromechanical code for treating fatigue life variability resulting from material variations. Dubbed MICROFAVA (micromechanical fatigue variability), the code is based on a set of physics-based fatigue models that predict fatigue crack initiation life, fatigue crack growth life, fatigue limit, fatigue crack growth threshold, crack size at initiation, and fracture toughness. Using microstructure information as material input, the code is capable of predicting the average behavior and the confidence limits of the crack initiation and crack growth lives of structural alloys under LCF or HCF loading. This paper presents a summary of the development of the code and highlights applications of the model to predicting the effects of microstructure on the fatigue crack growth response and life variability of the α+β Ti-alloy Ti-6Al-4V.

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Reference25 articles.

1. A Probabilistic Treatment of Microstructural Effects on Fatigue Crack Growth of Large Cracks;Chan;ASME J. Eng. Mater. Technol.

2. A Dislocation Model for Fatigue Crack Initiation;Tanaka;ASME J. Appl. Mech.

3. A Microstructure-Based Fatigue Crack Initiation Model;Chan;Metall. Mater. Trans. A

4. Scaling Laws for Fatigue Crack Growth of Large Cracks in Steels;Chan;Metall. Trans. A

5. Physically-based Models for Predicting Fatigue Life Variability in Ni-Based Superalloys;Chan

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