不同疲劳加载方法对金属悬臂梁性能影响的试验研究  

Experimental study on the effect of different fatigue loading method on the performance of metal cantilever beam

作　　者：何丁妮 廖云飞 崔韦[1] 张建波 HE Dingni;LIAO Yunfei;CUI Wei;ZHANG Jianbo(China Helicopter Research and Development Institute,Jingdezhen 333001,Jiangxi,China;Shanghai Aeronautical Materials&Structures Testing Co.,Ltd.,Shanghai 200120,China)

机构地区：[1]中国直升机设计研究所,江西景德镇333001 [2]上海航空材料结构检测股份有限公司,上海200120

出　　处：《实验力学》2022年第3期430-438,共9页Journal of Experimental Mechanics

基　　金：工信部民机预研课题资助项目(MJ-2017-F-21)。

摘　　要：为了探究不同疲劳加载方法对金属悬臂梁性能的影响,基于电磁振动台分别设计振动疲劳试验系统及相应常规疲劳试验系统,针对30CrNi4MoA合金钢悬臂梁进行弯曲疲劳试验研究。结果表明:30CrNi4MoA合金钢在循环次数为1×10^(7)cycle时的弯曲振动条件疲劳极限为514MPa,弯曲常规条件疲劳极限为516MPa;在循环次数小于1×10^(6)cycle时,30CrNi4MoA合金钢弯曲振动疲劳性能与常规疲劳性能差异较大,而当循环次数在1×10^(6)~1×10^(7)cycle时两者性能差异不大;两种疲劳加载方法下达到失效判据时试验件产生的损伤随应力水平的增加而增加;相同应力水平下,常规疲劳加载失效时试验件产生的损伤大于振动疲劳加载失效时的损伤。In order to investigate the influence of different fatigue loading methods on the performance of metal cantilever,the vibration fatigue test system and the corresponding normal fatigue test system are designed based on the vibration table,and the bending fatigue test of 30 CrNi4 MoA alloy steel cantilever is studied.The results show that in 10^(7) cycles,the vibration condition fatigue limit of 30 CrNi4 MoA alloy steel is 514 MPa,while the normal condition fatigue limit is 516 MPa.In fatigue cycle below 1×10^(6) cycles,the bending vibration fatigue properties of 30 CrNi4 MoA alloy steel are different from those of normal ones;while fatigue cycle between 1×10^(6) cycles and 1×10^(7) cycles,the performance of the two groups almost equivalent.When the failure criterion is reached,the damage increases with the increase of stress level;under the same stress level,the damage caused by normal fatigue loading is greater than that caused by vibration fatigue loading.

关 键 词：振动疲劳 常规疲劳 悬臂梁 疲劳性能 

分 类 号：TH113.1[机械工程—机械设计及理论]