摘要
以工程领域常用材料ZG270-500为研究对象,通过多组应变控制下的循环加载试验,分析了不同加载工况下的应力应变滞回曲线特征及响应应力幅值随循环次数的变化规律。试验结果表明,ZG270-500钢在单级应变循环载荷作用下表现出循环硬化特性和包申格效应;随着循环周次的增加,循环硬化速率最终趋于稳定的常值,且此常值与外加应变载荷幅值呈线性关系,正向加卸载分支比反载分支的包申格系数明显偏大,且都随应变幅值增大逐渐减小,即包申格效应减弱;多级应变循环加载时,前期较大的应变历史会提升后续小应变时的响应应力幅值。
In this paper, the ZG270-500, a commonly used material in the engineering field, is used as the research object. Through the cyclic loading test under multiple strain control conditions, the characteristics of the stress-strain hysteresis curve and the variation of the response stress amplitude with the number of cycles under different loading conditions are analyzed. The test results show that ZG270-500 steel exhibits cyclic hardening characteristics and Bauschinger effect under single-stage strain cycle loading. The cycle hardening rate eventually tends to a stable constant value with cycle times increasable, which is linearly related to the magnitude of applied strain loading. The forward-loading branch is significantly larger than the packet-bearing coefficient of the reverse-loading branch and decrease with the increase of the strain amplitude, that is to say, the Bausching effect is weakened. When multi-stage strain cyclic loading occurs, the large strain history in the early stage will increase the response stress amplitude at the subsequent small strain.
作者
张庆玲
张荣强
金淼
ZHANG Qingling;ZHANG Rongqiang;JIN Miao(Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University),Ministry of Education of China,Qinhuangdao,Hebei 066004,China)
出处
《燕山大学学报》
CAS
北大核心
2019年第5期449-454,共6页
Journal of Yanshan University
基金
国家自然科学基金资助项目(51575474)
河北省高校创新团队领军人才培育计划项目(LJRC012)
关键词
应变控制
响应应力幅值
循环硬化
包申格效应
strain control
response stress amplitude
cyclic hardening
Bauschinger effect
