Experimental investigations on combined high and low cycle fatigue:Material-level specimen design and strain response characteristics  

作　　者：Xin DING Dawei HUANG Zixu GUO Han YAN Xiaojun YAN Yinzhuoran WANG Feng YIN Xu LUAN 

机构地区：[1]Research and Development Center,Gas Turbine Corporation Ltd.of Aero Engine Corporation of China,Shenyang 110015,China [2]School of Energy and Power Engineering,Beihang University,Beijing 100191,China [3]Department of Mechanical Engineering,National University of Singapore,Singapore 117575,Singapore [4]School of Metallurgy,Northeastern University,Shenyang 110167,China

出　　处：《Chinese Journal of Aeronautics》2025年第1期380-394,共15页中国航空学报(英文版)

基　　金：co-supported by the National Natural Science Foundation of China(51805017);National Science and Technology Project(J2017-IV-0012-0049);National Science and Technology Project,China(J2019-IV-0007-0075);the Fundamental Research Funds for the Central Universities,China(JKF-20240036).

摘　　要：The paper designs a novel material-level specimen and its dedicated fixture suitable for applying Combined high-and low-Cycle Fatigue(CCF)loads.Unlike full-scale or simulation specimens,the CCF specimen eliminates geometrically induced stress gradients in the test region.Experimental data on CCF life and strain responses of ZSGH4169 alloy are acquired under different CCF loads.The Maximum Strain within Each(MSE)CCF cycle is demonstrated to be independent of the Low-Cycle Fatigue(LCF)loads and High-Cycle Fatigue(HCF)stress amplitudes,but exhibits a correlation with the Cycle Ratio of HCF/LCF(Rf).The growth law of MSE changes from linear to logarithmic as Rfdecreases.Strain amplitudes in the dwell stage,observed unaffected by Rf,are quantified as a function of LCF nominal stresses and HCF stress amplitudes.However,under a defined CCF load,strain amplitudes in the dwell stage remain constant.Strain peaks in the dwell stage in a single CCF cycle decrease in a power function with increasing HCF cycles.

关 键 词：Material-level specimen Low-cycle fatigue High-cycle fatigue Combined high-and low-cycle fatigue Fatigue life Strain response 

分 类 号：V231.95[航空宇航科学与技术—航空宇航推进理论与工程]