循环荷载下7075高强铝合金本构模型研究  

Study on constitutive model of 7075 high-strength aluminum alloy under cyclic loading

作　　者：常召群 彭平泽 邢国华[1] 李锦源 韩萌 刘伯权[1] CHANG Zhaoqun;PENG Pingze;XING Guohua;LI Jinyuan;HAN Meng;LIU Boquan(School of Civil Engineering,Chang’an University,Xi’an 710061,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《地震工程与工程振动》2025年第2期164-172,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(52308137,52178103);陕西省自然科学基金项目(2023-JC-QN-0617);中央高校基本科研业务费专项资金(300102281303)。

摘　　要：为了描述7075高强铝合金的力学性能,设计制作了3个高强铝合金单调拉伸试件及5个循环加载试件,基于Ramberg-Osgood模型分别对单调拉伸应力-应变曲线及循环加载骨架曲线进行数值拟合,对比分析了铝合金的受拉力学性能与滞回力学性能,标定了高强铝合金的混合强化参数,建立了铝合金的混合强化滞回本构模型,利用ABAQUS软件建立了高强铝合金的数值模型,模拟分析结果与试验结果进行了对比验证。研究表明:7075高强铝合金具有良好的滞回性能,Ramberg-Osgood模型对高强铝合金单调力学性能表现出了良好的适用性;基于混合强化模型的有限元模拟结果与试验结果吻合较好,该混合强化模型及标定参数值可用于铝合金加固结构的抗震性能分析中。To characterize the mechanical properties of 7075 high-strength aluminum alloy,three specimens for the monotonic tensile test and five specimens for cyclic loading were designed and fabricated.Based on the Ramberg-Osgood model,numerical fitting was carried out separately for the monotonic tensile stress-strain curves and cyclic loading skeleton curves of aluminum alloy bars.A comparative analysis was conducted on the tensile mechanical properties and hysteresis mechanical properties of 7075 high-strength aluminum alloy.The combined hardening parameters for high-strength aluminum alloy were calibrated,and a combined hardening hysteresis constitutive model was established.Using the software ABAQUS,a numerical analysis model of high-strength aluminum alloy was created,and the simulation results were compared with and validated against experimental results.The results indicate that 7075 high-strength aluminum alloy exhibits excellent hysteresis performance,and the Ramberg-Osgood model shows good applicability to the monotonic mechanical properties of high-strength aluminum alloy.The finite element simulation results based on the combined hardening model are in good agreement with the test results.The calibrated combined hardening model can be used for the seismic behavior analysis of structures reinforced with high-strength aluminum alloy.

关 键 词：7075高强铝合金 循环荷载 混合强化模型 本构模型 有限元分析 

分 类 号：TU512.4[建筑科学—建筑技术科学]