A new non-linear continuum damage mechanics model for fatigue life prediction under variable loading

作者：Yuan, Rong^*; Li, Haiqing; Huang, Hong-Zhong; Zhu, Shun-Peng; Li, Yan-Feng

来源：Mechanika, 2013, 19(5): 506-511.

DOI：10.5755/j01.mech.19.5.5541

• non-linear fatigue damage accumulation
• continuum damage mechanics
• mean stress
• loading sequence
• fatigue life prediction

Fatigue is a damage accumulation process in which material property deteriorates continuously. For the usual failure mode of mechanical components under variable loading, fatigue life prediction issues are very important for selection, design, and safety assessments of these components. Based on continuum damage mechanics theory, this paper presents a new non-linear fatigue damage accumulation model for fatigue life prediction under variable loading. The proposed model has been formulated to take the damage evolution of material and the effects of loading sequence on fatigue life under different loading conditions into account. Moreover, it considers the mean stress effects through characterizing the damage evolution of materials with fewer parameters. Experimental data of 30NiCrMoV12 and 30CrMnSiA under two-stress level loading from literature were used to verify the proposed model. Predicted fatigue lives using the proposed model show a good agreement with the reported experimental data.

• 出版日期2013
• 单位电子科技大学