5052铝合金的动态拉伸性能及其本构模型  

Dynamic Tensile Properties and Constitutive Model of 5052 Aluminum Alloy

作　　者：方进秀 张兴权[4] 王会廷 谢玲玲 FANG Jinxiu;ZHANG Xingquan;WANG Huiting;XIE Lingling(Anhui Province Key Laboratory of Metallurgical Engineering&Resources Recycling,Anhui University of Technology,Ma'nshan 243002;School of Metallurgic Engineering,Anhui University of Technology,Ma'anshan 243002;Maanshan Ruihui Industrial Co.,Ltd.,Ma'anshan 243002;School of Mechanical Engineering,Anhui University of Technology,Ma'anshan 243002)

机构地区：[1]安徽工业大学冶金工程与资源综合利用安徽省重点实验室,马鞍山243002 [2]安徽工业大学冶金工程学院,马鞍山243002 [3]马鞍山瑞辉实业有限公司,马鞍山243002 [4]安徽工业大学机械工程学院,马鞍山243002

出　　处：《机械工程学报》2022年第8期160-169,共10页Journal of Mechanical Engineering

基　　金：冶金工程与资源综合利用安徽省重点实验室2020年度开放基金(SKF20-03);安徽省自然科学基金(1908085QE229,1708085ME110);安徽省重点研究与开发计划(201904a05020065);安徽工业大学校青年基金(QZ201802)资助项目。

摘　　要：为了提高5052铝合金在应用中的安全性,准确的计算结构件在复杂载荷下的强度,非常有必要对材料在不同应变率下的力学性能进行研究。本文分别采用高温电子万能试验机和霍普金森拉杆装置对其进行了准静态和高应变率下的拉伸试验,得到了材料的应力-应变曲线,构建了能够准确描述其塑性变形行为的本构模型。结果表明:5052铝合金具有明显的应变率敏感性,且随着应变率的增加,其屈服强度和强度极限不断增加。基于试验结果,本文提出采用一种修正的Johnson-Cook模型来拟合材料的动态本构关系,拟合结果与试验数据吻合度较高;进一步使用ANSYS软件用此模型模拟了高应变率下试样的单向拉伸过程,提取典型节点的应力应变曲线,模拟结果与试验结果相吻合。说明本文所建立的修正Johnson-Cook模型能够较好地描述5052铝合金的动态特性,可为实际工程中的数值模拟问题提供数据支持,从而为零部件的加工工艺、结构设计和实际生产提供可靠的参考和有效的指导。In order to improve the safety of 5052 aluminum alloy in application and accurately calculate the strength of structural parts under complex loads,it is very necessary to study the mechanical properties of materials at different strain rates.In this paper,high temperature electronic universal testing machine and split Hopkinson tensile bar(SHTB) device are used to carry out the quasi-static and high strain rate tensile tests,the stress-strain curves of the materials are obtained,and a constative model which could accurately describe the plastic deformation behavior of the material is established.The results show that 5052 aluminum alloy has a distinct strain rate sensitivity,and with the increase of strain rate,the yield strength and ultimate strength increasing.Based on the experimental results,a modified Johnson-Cook model is proposed to fit the dynamic constitutive relation of the material,the fitting results are in good agreement with the test data;the ANSYS software is further used to simulate the uniaxial tensile process of the sample under high strain rate,and the stress-strain curve of the typical node is extracted,the results is consistent with the test result.It is indicated that the modified Johnson-Cook model can better describe the dynamic characteristics of 5052 aluminum alloy,and can provide data support for numerical simulation in practical engineering,so as to provide reliable reference and effective guidance for parts processing technology,structural design and actual production.

关 键 词：5052铝合金 霍普金森拉杆 动态本构关系 Johnson-Cook本构模型 

分 类 号：TG146[一般工业技术—材料科学与工程]