Strain energy-based fatigue life prediction under variable amplitude loadings

Shun-Peng Zhu, Peng Yue, Jose Correia, Sergio Blason, Abilio De Jesus and Qingyuan Wang

Abstract

With the aim to evaluate the fatigue damage accumulation and predict the residual life of engineering components under variable amplitude loadings, this paper proposed a new strain energy-based damage accumulation model by considering both effects of mean stress and load interaction on fatigue life in a low cycle fatigue (LCF) regime. Moreover, an integrated procedure is elaborated for facilitating its application based on S-N curve and loading conditions. Eight experimental datasets of aluminum alloys and steels are utilized for model validation and comparison. Through comparing experimental results with model predictions by the proposed, Miner\'s rule, damaged stress model (DSM) and damaged energy model (DEM), results show that the proposed one provides more accurate predictions than others, which can be extended for further application under multi-level stress loadings.

Key Words

fatigue; life prediction; mean stress; load interaction; S-N curve

Address

Shun-Peng Zhu: 1) Institute of Reliability Engineering, School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China 2) Key Laboratory of Deep Earth Science and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China Peng Yue: 1) Institute of Reliability Engineering, School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China 2) Bazhong Professional Technology College, Bazhong 636000, China Jose Correia and Abilio De Jesus: INEGI, Faculty of Engineering, University of Porto, Porto 4200-465, Portugal Sergio Blason: Department of Construction and Manufacturing Engineering, University of Oviedo, Gijon 33203, Spain Qingyuan Wang: 1) Key Laboratory of Deep Earth Science and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China 2) School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China

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