Nonlinear fatigue life prediction model based on isodamage curve considering two‐block loading

Author:

Yun Yuheng1,Shi Duoqi1,Fan Jiangbo1,Li Zhenlei2,Fan Yongshen2,Yang Xiaoguang1ORCID

Affiliation:

1. School of Energy and Power Engineering Beihang University Beijing China

2. Research Institute of Aero‐Engine Beihang University Beijing China

Abstract

AbstractA non‐linear life prediction model considering the loading history is proposed based on isodamage curve. The stress‐controlled low‐high block loading of low cycle fatigue (LCF) at high temperature, with various previous cycles, was performed on a nickel‐based superalloy. The damage evolvement of the prior loading was revealed using scanning electron microscopy under the low‐high block loading, especially the failure mechanism of coaxing effect. In addition, load history correlation factor was introduced to describe the influence of prior cycle. Based on the Ni‐based superalloy, the life prediction model of two‐step loading, including the low‐high block (LH) and high‐low block loading (HL), was proposed, agreeing well with the experimental results for different metals. Compared with other life prediction models, the proposed model demonstrated the higher prediction accuracy and wider applicability.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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