A damage coupled elasto-plastic constitutive model of marine high-strength steels under low cycle fatigue loadings

• Published in: The International journal of pressure vessels and piping 2023-10, Vol.205, p.104982, Article 104982
• Main Authors: Chen, Xipeng, Yue, Jingxia, Wu, Xuanfu, Lei, Jiankang, Fang, Xuan
• Format: Article
• Language: English
• Subjects: Constitutive model; Cyclic loadings; High strength steels; Low cycle fatigue damage
• ISSN: 0308-0161; 1879-3541
• DOI: 10.1016/j.ijpvp.2023.104982

To investigate the low cycle fatigue (LCF) performance and damage behaviours of marine high strength steels (HSSs), experimental analysis and constitutive modelling are carried out in this study. Basic mechanical properties are obtained by the monotonic tensile tests. Cyclic loading tests with different loading protocols are conducted to examine the cyclic stress-strain response. Based on the experimental data, the evolutions of peak stress, yield surface radius, backstress and LCF damage are discussed. The Ramberg-Osgood model and Manson-Coffin equation are fitted to characterize the cyclic stress-strain relation and LCF damage behaviours, respectively. Based on the continuum damage mechanics, a damage coupled cyclic elasto-plastic constitutive model is proposed to describe the hysteresis behaviours of marine HSSs. The model parameters are calibrated, and the model accuracy for stress-strain response and fatigue damage prediction is then verified by experimental data. •Constitutive model of marine high strength steels coupled with low cycle fatigue damage is proposed.•Hardening and fatigue performances of marine high strength steels are experimental investigated.•Parameters of Manson-Coffin equation and Hardening model are calibrated.