An improved fatigue life prediction model based on loading sequence  

作　　者：Qiwen Xue Xiuyun Du 

机构地区：[1]Dalian Jiaotong University,Dalian,China

出　　处：《Railway Sciences》2022年第1期90-97,共8页铁道科学（英文）

基　　金：the National Natural Science Foundation of China(10802015);the Joint Fund of Natural Science Foundation of Liaoning Province(2015020119);the Liaoning Province Graduate Education and Teaching Reform Research Project(2017);the Liaoning Province Transformation and the Innovation and Entrepreneurship Education Project(2017).

摘　　要：Purpose–In view of the difficulty in determining the key parameters d in the Corten-Dolan model,based on the introduction of small loads,damage degrees and stress states to the Corten-Dolan model and the existing improved model,the sequential effects of the adjacent two-stage load were further considered.Design/methodology/approach–Two improved Corten-Dolan models were established on the basis of modifying the parameter d by two different methods,namely,increasing stress ratio coefficient as well as considering the effects of loading sequence and damage degree as independent influencing factors respectively.According to the test data of the welded joints of common materials(standard 45 steel),alloy materials(standard 16Mn steel)and Q235B steel,the validity and feasibility of the above two improved models for fatigue life prediction were verified.Findings–Results show that,compared with the traditional Miner model and the existing Corten-Dolan improved model,the two improved models have higher prediction accuracy in the fatigue life prediction of welding materials whether under two-stage load or multi-stage load.Originality/value–Because the mathematical expressions of the models are relatively simple and need no multi-layer iterative calculation,it is convenient to predict the fatigue life of welded structure in practical engineering.

关 键 词：Loading sequence Corten-Dolan model Fatigue life Accumulated damage Parameter correction Welding material 

分 类 号：TG1[金属学及工艺—金属学]