Notch Fatigue Property of 7050-T7451 Aluminum Alloy under Bending Resonance Environment

Mechanics Pub Date : 2024-02-23 DOI:10.5755/j02.mech.33709

Dingni He, Wei Cui, Yunfei Liao, Jianbo Zhang

{"title":"Notch Fatigue Property of 7050-T7451 Aluminum Alloy under Bending Resonance Environment","authors":"Dingni He, Wei Cui, Yunfei Liao, Jianbo Zhang","doi":"10.5755/j02.mech.33709","DOIUrl":null,"url":null,"abstract":"Based on the electromagnetic shaker table, the resonant fatigue testing system and the corresponding conventional fatigue testing system were designed respectively. The fatigue life (S-N) curves of smooth and notched 7050-T7451 aluminum alloy specimens were measured in the range of 105-107 cycles, and the notch fatigue property of 7050-T7451 aluminum alloy under bending resonance environment was studied. The results indicate that the fracture mechanism under bending resonant fatigue environment is roughly the same as that under bending conventional fatigue loading. All the S-N curves obtained through resonant and conventional fatigue tests show a continuously downward trend, and there are no obvious fatigue limits. Notch fatigue property under bending resonance environment presents “stage characteristics”, which increases first and then decreases with the increase of cycles. There is a critical cycle number Nc at 8×105 cycles, corresponding to the maximum fatigue notch factor Kf-max (or the maximum notch sensitivity factor qmax). There are two critical cycles N1 and N2. When N1<N<N2, the notch fatigue property of the material and the corresponding structures under resonance environment requires more consideration than conventional fatigue loading.","PeriodicalId":511970,"journal":{"name":"Mechanics","volume":"25 24","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mechanics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5755/j02.mech.33709","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

Based on the electromagnetic shaker table, the resonant fatigue testing system and the corresponding conventional fatigue testing system were designed respectively. The fatigue life (S-N) curves of smooth and notched 7050-T7451 aluminum alloy specimens were measured in the range of 105-107 cycles, and the notch fatigue property of 7050-T7451 aluminum alloy under bending resonance environment was studied. The results indicate that the fracture mechanism under bending resonant fatigue environment is roughly the same as that under bending conventional fatigue loading. All the S-N curves obtained through resonant and conventional fatigue tests show a continuously downward trend, and there are no obvious fatigue limits. Notch fatigue property under bending resonance environment presents “stage characteristics”, which increases first and then decreases with the increase of cycles. There is a critical cycle number Nc at 8×105 cycles, corresponding to the maximum fatigue notch factor Kf-max (or the maximum notch sensitivity factor qmax). There are two critical cycles N1 and N2. When N1

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

7050-T7451 铝合金在弯曲共振环境下的缺口疲劳特性

以电磁振动台为基础，分别设计了共振疲劳试验系统和相应的传统疲劳试验系统。测量了 7050-T7451 铝合金光滑试样和缺口试样在 105-107 次循环范围内的疲劳寿命（S-N）曲线，研究了 7050-T7451 铝合金在弯曲共振环境下的缺口疲劳特性。结果表明，弯曲共振疲劳环境下的断裂机制与弯曲传统疲劳加载下的断裂机制大致相同。通过共振和常规疲劳试验获得的所有 S-N 曲线均呈持续下降趋势，且没有明显的疲劳极限。弯曲共振环境下的缺口疲劳特性呈现出 "阶段性特征"，随着循环次数的增加，缺口疲劳特性先增大后减小。在 8×105 次循环时有一个临界循环数 Nc，对应于最大疲劳缺口系数 Kf-max（或最大缺口敏感系数 qmax）。有两个临界循环数 N1 和 N2。当 N1

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Mechanics

自引率

0.00%

发文量