Residual Life Prediction Based on Nonlinear Fatigue Damage Accumulation Model

• Published in: Shanghai jiao tong da xue xue bao Vol. 20; no. 4; pp. 449 - 453
• Main Author: 高会英 左芳君 吕志强 朱顺鹏 黄洪钟
• Format: Journal Article
• Language: English
• Published: Shanghai Shanghai Jiaotong University Press 01.08.2015
• Subjects: Approximation; Architecture; Computer Science; Damage accumulation; Electrical Engineering; Engineering; Exponents; Fatigue (materials); Fatigue failure; Life Sciences; Materials Science; Mathematical models; Nonlinearity; damage accumulation; fatigue; nonlinear; residual life prediction; O 346.2
• DOI: 10.1007/s12204-015-1647-2
• ISSN: 1007-1172

When a nonlinear fatigue damage accumulation model based on damage curve approach is used to get better residual life prediction results, it is necessary to solve the problem caused by the uncertain exponent of the model. Considering the effects of load interaction, the assumption that there is a linear dependence between the exponent ratio and the loading ratio is established to predict fatigue residual life of materials. Three experimental data sets are used to validate the rightness of the proposition. The comparisons of experimental data and predictions show that the predictions based on the proposed proposition are in good accordance with the experimental results as long as the parameters that represent the linear correlativity are set an appropriate value. Meanwhile, the accuracy of the proposition is approximated to that of an existing model. Therefore, the proposition proposed in this paper is reasonable for residual life prediction.