铝合金冲压件疲劳损伤规律的试验研究

doi:10.3901/JME.2023.10.117

机械工程学报 ›› 2023, Vol. 59 ›› Issue (10): 117-123.doi: 10.3901/JME.2023.10.117

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铝合金冲压件疲劳损伤规律的试验研究

周迅, 张振涛, 高云, 尉朋, 潘骏, 陈文华

浙江理工大学机电产品可靠性分析与测试国家地方联合工程研究中心杭州 310018

收稿日期:2022-06-09 修回日期:2022-10-05 出版日期:2023-05-20 发布日期:2023-07-19
通讯作者: 陈文华(通信作者),男,1963年出生,博士,教授,博士研究生导师。主要研究方向为可靠性分析、设计与试验。E-mail:chenwh@zstu.edu.cn E-mail:chenwh@zstu.edu.cn
作者简介:周迅,男,1978年出生,博士,副教授,硕士研究生导师。主要研究方向为机械疲劳与断裂、动力学仿真与试验、疲劳可靠性分析等。E-mail:zhouxun@zstu.edu.cn;张振涛,男,1996年出生,硕士研究生。主要研究方向为疲劳可靠性分析。E-mail:1109873298@qq.com
基金资助:
浙江省万人计划杰出人才资助项目(2018R51008)。

Experimental Study on Fatigue Damage of Aluminum Alloy Stamping Parts

ZHOU Xun, ZHANG Zhentao, GAO Yun, WEI Peng, PAN Jun, CHEN Wenhua

National & Local Joint Engineering Research Center of Reliability Analysis and Testing for Mechanical and Electrical Products, Zhejiang Sci-Tech University, Hangzhou 310018

Received:2022-06-09 Revised:2022-10-05 Online:2023-05-20 Published:2023-07-19

摘要/Abstract

摘要： 为研究冲压工艺对铝合金薄板疲劳寿命的影响,开展冲压成形试验及成形件的疲劳试验。以试验结果为基础并结合有限元仿真,分析不同成形条件下铝合金冲压件的应变率、厚度减薄率和残余应力对疲劳损伤产生的影响。一方面,利用疲劳极限统计法对试验数据进行分析,结果显示冲压成形试样的疲劳极限的中值高于对照组直接弯曲成形试样,但分散性更大。另一方面,利用有限元仿真得到试样在含不同长度裂纹时疲劳试验系统的共振频率,将其与疲劳试验过程中所记录的疲劳试验系统的共振频率变化历程对应,建立各组试样的疲劳损伤累积曲线。结果显示,相比对照组,冲压成形试样的损伤累积曲线在开始阶段更平缓,而末尾阶段更陡峭,拐点更靠后,且冲压高度越大则此特征越明显。此特征意味着冲压件的疲劳寿命对加载条件更为敏感。

关键词: 应变率, 疲劳试验, 疲劳极限, 裂纹, 疲劳损伤

Abstract: To study the influence of stamping process on the fatigue life of aluminum alloy sheet, stamping forming test and fatigue test for the formed sheets were carried out. Based on the test results and FEA simulation, the influence of strain rate, thickness reduction and residual stress on the fatigue damage were analyzed. Firstly, fatigue limit analysis was conducted using statistical regression algorithm. The results show that the stamping formed specimens have higher mean value but worse dispersion than the specimens of comparison, which were bent in a quasi-static way. Secondly, the resonant frequencies of the fatigue test system with different size cracks in the specimen were calculated using FEA method. By remapping the calculated frequencies with history of the physical resonant frequency which was recorded in sync with loading cycles during the fatigue test, fatigue damage cumulative curves were established. It is shown that the former stage of the curve is flatter and the latter stage is steeper than that of the comparison group. The inflection point that separating the two stages on the curve is also larger than that of the comparison group. The higher the stamping energy is, the more obviously the characteristics is. Such a characteristics implies that the fatigue life of stamping parts is more sensitive to load variability.

Key words: strain rate, fatigue test, fatigue limit, crack, fatigue damage

中图分类号:

TH136

周迅, 张振涛, 高云, 尉朋, 潘骏, 陈文华. 铝合金冲压件疲劳损伤规律的试验研究[J]. 机械工程学报, 2023, 59(10): 117-123.

ZHOU Xun, ZHANG Zhentao, GAO Yun, WEI Peng, PAN Jun, CHEN Wenhua. Experimental Study on Fatigue Damage of Aluminum Alloy Stamping Parts[J]. Journal of Mechanical Engineering, 2023, 59(10): 117-123.

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铝合金冲压件疲劳损伤规律的试验研究

Experimental Study on Fatigue Damage of Aluminum Alloy Stamping Parts

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