Data Fitting Analysis for Fatigue Crack Growth under Multiple Overload Variable Amplitude Loading

Abstract:

The present study aims at evaluating residual fatigue life under multiple overload variable amplitude loading (VAL) by using a dynamical coefficient mechanics (DCM) model which we have reported for data fitting analysis. New formulas connecting the crack length with number of cycles and expressions for fatigue crack growth (FCG) under multiple overload VAL have been derived and were used to predict crack propagation. The ratios of predicted-to-experimental lives range from 1.01 to 1.03, which indicates that the results obtained from this DCM model are in good agreement with experimental data from published literatures and cover all stages of fatigue crack growth curve.

• Periodical: Advanced Materials Research (Volume 663)
• Pages: 645-649
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.663.645
• Online since: February 2013
• Authors: Zhi Fang Liu, Li Xiong Gu, Zhong Yong Xu
• Keywords: Data Fitting Analysis, Dynamical Coefficient Mechanics Model, Fatigue Crack Growth (FCG), Multiple Overload Variable Amplitude Loading

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