多种循环加载制度下Q235材料性能试验

中国机械工程

多种循环加载制度下Q235材料性能试验

张庆玲1,2;金淼1,2;张荣强1,2;李群1,2

1.燕山大学先进锻压成形技术与科学教育部重点实验室，秦皇岛，066004
2.燕山大学机械工程学院，秦皇岛，066004

出版日期:2019-11-10 发布日期:2019-11-08
基金资助:
国家自然科学基金资助项目(51575474，51475408)；
河北省高校创新团队领军人才培育计划资助项目(LJRC012)

Material Performance Tests of Q235 under Multiple Cyclic Loading Conditions

ZHANG Qingling1，2;JIN Miao1，2;ZHANG Rongqiang1，2;LI Qun1，2

1.Key Laboratory of Advanced Forging & Stamping Technology and Science(Yanshan University),Ministry of Education of China,Qinhuangdao,Hebei,066004
2.School of Mechanical Engineering,Yanshan University,Qinhuangdao,Hebei,066004

Online:2019-11-10 Published:2019-11-08

摘要/Abstract

摘要： 对Q235钢进行了变应力载荷幅值及不同预变形和载荷保持时间等条件下的循环加载试验，并分析了其力学响应和材料性能。研究结果表明：Q235钢在应力控制的循环加载过程中表现出明显的循环软化特性和棘轮效应，棘轮应变的大小主要取决于载荷水平；当循环载荷逐级增大时，前期的变形会导致后期的棘轮应变增大；而当循环载荷逐级减小时，后期的棘轮应变值取决于最大载荷时的棘轮应变，且棘轮应变率接近于零；当预变形的响应应力峰值小于后期控制应力峰值时，预变形对材料的棘轮效应具有抑制作用，且预变形量越大，抑制效果越明显；载荷保持时间延长会使材料的棘轮应变增大，棘轮应变率增大，从而加速材料失效。

关键词: 循环加载, 棘轮效应, 变幅值, 预变形, 载荷保持时间

Abstract: The cyclic loading tests of Q235 steel with variable stress loading amplitudes and different pre-deformations and loading holding time were carried out, and the mechanics responses and material performances were analyzed. The results show that under cyclic stress loading Q235 steel shows cyclic softening characteristics and ratcheting, and the ratcheting strain mainly depends on loading levels. When the loading level increases step by step, the early deformations lead to the later ratcheting strain increase. When the loading level decreases step by step, the later ratcheting strain depends on the ratcheting strain under the maximum loading conditions, and the ratcheting strain rate is close to zero. When the response stress peak of the pre-deformations is smaller than the later stress loading peak, the pre-deformations have an inhibiting effect on the ratcheting. And the greater the pre-deformation the more obvious the inhibiting effect. The loading holding time increases both of the ratcheting strain and ratcheting strain rate, which accelerate the material failures.

Key words: cyclic loading, ratcheting, variable amplitude, pre-deformation, loading holding time

中图分类号:

TG142.1

张庆玲1,2;金淼1,2;张荣强1,2;李群1,2. 多种循环加载制度下Q235材料性能试验[J]. 中国机械工程.

ZHANG Qingling1，2;JIN Miao1，2;ZHANG Rongqiang1，2;LI Qun1，2. Material Performance Tests of Q235 under Multiple Cyclic Loading Conditions[J]. China Mechanical Engineering.

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