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Advances in Materials Science and Engineering
Volume 2016, Article ID 2193684, 7 pages
http://dx.doi.org/10.1155/2016/2193684
Research Article

A Modified Fatigue Damage Model for High-Cycle Fatigue Life Prediction

1Department of Engineering Mechanics, Southeast University, Nanjing 210096, China
2Jiangsu Key Laboratory of Engineering Mechanics, Nanjing 210096, China

Received 15 November 2015; Revised 17 January 2016; Accepted 20 January 2016

Academic Editor: Konstantinos G. Anthymidis

Copyright © 2016 Meng Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Based on the assumption of quasibrittle failure under high-cycle fatigue for the metal material, the damage constitutive equation and the modified damage evolution equation are obtained with continuum damage mechanics. Then, finite element method (FEM) is used to describe the failure process of metal material. The increment of specimen’s life and damage state can be researched using damage mechanics-FEM. Finally, the lifetime of the specimen is got at the given stress level. The damage mechanics-FEM is inserted into ABAQUS with subroutine USDFLD and the Python language is used to simulate the fatigue process of titanium alloy specimens. The simulation results have a good agreement with the testing results under constant amplitude loading, which proves the accuracy of the method.