A Modified Cumulative Damage Model for Fatigue Life Prediction under Variable Amplitude Loadings

Abstract:

To evaluate the fatigue damage accumulation and predict the residual life of components at different stress levels, this paper proposed a modified cumulative damage model based on the strain energy density parameter. Noting that mean stress and load interaction under uniaxial fatigue loading exhibit significant effects on fatigue damage accumulation and life prediction. According to this, a new model based on damaged stress model which considers the effects of mean stress and load interaction was presented in this paper. The proposed model was verified by using four experimental data sets of aluminium alloys and steels. The experimental results are compared with those of the Miner’s rule, damaged stress model (DSM) and damaged energy model (DEM). Results show that the proposed model agrees better with the experimental observations than others.

• Periodical: Applied Mechanics and Materials (Volume 853)
• Pages: 62-66
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.853.62
• Online since: September 2016
• Authors: Peng Yue, Qiang Lei, Cheng Lin Zhang, Shun Peng Zhu*, Hong Zhong Huang
• Keywords: Fatigue, Life Prediction, Load Interaction, Mean Stress, Wöhler Curve

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