Energy field intensity approach for probabilistic notch fatigue assessment under size effect  

作　　者：Ding LIAO Shunpeng ZHU Jiewei GAO Xuekang LI JoséCORREIA Rui CALÇADA Qingyuan WANG 

机构地区：[1]School of Mechanical and Electrical Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China [2]Department of Civil Engineering,Faculty of Engineering,University of Porto,Porto 4200-465,Portugal [3]School of Mechanical Engineering,Xihua University,Chengdu 610039,China [4]Kunming Shipborne Equipment Research and Test Center,Kunming 650051,China [5]Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province,College of Architecture and Environment,Sichuan University,Chengdu 610065,China [6]Advanced Research Institute,Chengdu University,Chengdu 610106,China

出　　处：《Chinese Journal of Aeronautics》2025年第2期111-127,共17页中国航空学报(英文版)

基　　金：support from the Key Program of the National Natural Science Foundation of China(No.12232004);the Training Program of the Sichuan Province Science and the Technology Innovation Seedling Project(No.MZGC20230012)are acknowledged.

摘　　要：The development of modern engineering components and equipment features large size,intricate shape and long service life,which places greater demands on valid methods for fatigue performance analysis.Achieving a smooth transformation between small-scale laboratory specimens’fatigue properties and full-scale engineering components’fatigue strength has been a long-term challenge.In this work,two dominant factors impeding the smooth transformation—notch and size effect were experimentally studied,in which fatigue tests on Al 7075-T6511(a very high-strength aviation alloy)notched specimens of different scales were carried out.Fractography analyses identified the evidence of the size effect on notch fatigue damage evolution.Accordingly,the Energy Field Intensity(EFI)initially developed for multiaxial notch fatigue analysis was improved by utilizing the volume ratio of the Effective Damage Zones(EDZs)for size effect correction.In particular,it was extended to a probabilistic model considering the inherent variability of the fatigue phenomenon.The experimental data of Al 7075-T6511 notched specimens and the model-predicted results were compared,indicating the high potential of the proposed approach in fatigue evaluation under combined notch and size effects.

关 键 词：Notch fatigue Size effect Energy field intensity Life prediction Probabilistic modelling 

分 类 号：TG1[金属学及工艺—金属学]