非对称循环载荷下Q235钢力学响应特性分析  

Analysis of the mechanical response characteristics of Q235 steel under asymmetrical cyclic loading

作　　者：张庆玲[1,2] 金淼[1,2] 李群[1,2] 郭宝峰[1,2] ZHANG Qingling;JIN Miao;LI Qun;GUO Baofeng(Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University), Ministry of Education of China, Qinhuangdao 066004, China;School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China)

机构地区：[1]燕山大学先进锻压成形技术与科学教育部重点实验室,河北秦皇岛066004 [2]燕山大学机械工程学院,河北秦皇岛066004

出　　处：《哈尔滨工程大学学报》2021年第4期581-587,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(52075474);河北省自然科学基金项目(E2019203560);河北省高校创新团队领军人才培育计划(LJRC012).

摘　　要：为了准确判断Q235钢在非对称应力循环载荷作用下产生的棘轮效应、包申格效应及循环软/硬化特性对材料性能的影响,本文进行了多种非对称应力条件下的循环加载试验。采用数据分析的方法,研究了Q235钢力学变形行为与加载工况之间的关系。试验表明:Q235钢棘轮应变和棘轮应变率的正负与平均应力符号相同;平均应力为负值时,表现为循环硬化特性,压缩屈服应力大于拉伸屈服应力;平均应力为正值时,表现为循环软化特性,拉伸屈服应力大于压缩屈服应力;在平均应力符号相同条件下,第1周的屈服应力也基本相同。研究结果为结构设计和建立精确的循环本构模型提供了理论依据。To accurately determine the effects of the ratcheting effect,Bauschinger effect,and cyclic softening and hardening characteristics of Q235 steel on the material properties under asymmetric cyclic stress loading,we conduct various cyclic loading tests under asymmetric stress conditions.The relationships between the mechanical deformation behaviors of Q235 steel and loading conditions are discussed by means of data analysis.The test shows that the positive and negative signs of ratcheting strain and ratcheting strain rate of Q235 steel are the same as those of the mean stress.When the mean stress is negative,it shows a cyclic hardening characteristic,and the compressive yield stress is greater than the tensile yield stress.When the mean stress is positive,it shows a cyclic softening characteristic,and the tensile yield stress is greater than the compression yield stress.Under the condition of the same mean stress sign,the yield stress of the first cycle is basically the same.Results provide theoretical data for the structural design and the establishment of an accurate cyclic constitutive model.

关 键 词：非对称循环载荷 包申格效应 循环软硬化 棘轮效应 屈服应力 Q235钢 平均应力 应力幅值 

分 类 号：TB31[一般工业技术—材料科学与工程]