A generalized strain energy density exhaustion model allowing for compressive hold effect

作者：Wang, Run-Zi; Zhu, Xu-Min; Zhang, Xian-Cheng^*; Tu, Shan-Tung^*; Gong, Jian-Guo; Zhang, Cheng-Cheng

来源：International Journal of Fatigue, 2017, 104: 61-71.

DOI：10.1016/j.ijfatigue.2017.07.008

• Life prediction
• Strain energy density exhaustion
• Damage
• Oxidation
• Interaction diagram

The aim of the present work is to propose a generalized strain energy density exhaustion model to predict the creep-fatigue lives. The oxidation damage, which is described by a correction factor representing the non-linear oxidation damage mechanism, is considered in the proposed model. All the 77 experimental data sets of GH4169 superalloy at 650 degrees C, Inconel 738 superalloy at 850 degrees C and P91 steel at 550 degrees C in both tension-hold-only and compression-hold-only tests are used to validate the prediction capabilities of the model. The fatigue, creep and oxidation damages per cycle are separately calculated. Then a three-dimensional damage interaction diagram combined with a suitable enveloping surface is proposed.

• 出版日期2017-11
• 单位华东理工大学