热成形工艺条件下7075-H18铝合金板材塑性流动行为的本构建模

doi:10.3901/JME.2024.02.188

机械工程学报 ›› 2024, Vol. 60 ›› Issue (2): 188-196.doi: 10.3901/JME.2024.02.188

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热成形工艺条件下7075-H18铝合金板材塑性流动行为的本构建模

王刚¹, 谷诤巍¹, 于歌^1,2, 李欣¹

1. 吉林大学材料科学与工程学院长春 130022;
2. 吉林大学辊锻工艺研究所长春 130022

收稿日期:2023-03-28 修回日期:2023-11-23 出版日期:2024-01-20 发布日期:2024-04-09
通讯作者: 李欣(通信作者)，女，1980年出生，博士，教授，博士研究生导师。主要研究方向为材料合成与加工工艺。E-mail：jlu_lixin@126.com
作者简介:王刚，男，1985年出生，博士研究生。主要研究方向为金属板材成形技术。E-mail：wangg15@mails.jlu.edu.cn
基金资助:
吉林省科技发展计划(20210201038GX)和吉林省科技厅创新平台和人才专项(20230508039RC)资助项目。

Plastic Flow Behavior and Constitutive Model of 7075-H18 Aluminum Alloy Sheet Based on Hot Forming Process

WANG Gang¹, GU Zhengwei¹, YU Ge^1,2, LI Xin¹

1. College of Materials Science and Engineering, Jilin University, Changchun 130022;
2. Roll Forging Research Institute, Jilin University, Changchun 130022

Received:2023-03-28 Revised:2023-11-23 Online:2024-01-20 Published:2024-04-09

摘要/Abstract

摘要： 为支撑7xxx系高强度铝合金板材热成形工艺设计与模具开发，以适合于热成形连续生产的7075-H18板材为研究对象，采用Gleeble-3800热力模拟试验系统对7075板材在热成形条件下的热拉伸流变特征进行较系统地研究，并基于热拉伸试验数据构建改进型Arrhenius本构模型。热拉伸试验结果显示7075板材的流变行为对变形温度与应变速率较为敏感。在选定的温度区间(300～450 ℃)与应变速率范围(0.001～10 s^-1)内，板材试样的塑性流动应力随着变形温度的升高或应变速率的减小而显著减小，断后延伸率随着温度或应变速率的升高而增大。改进型Arrhenius模型准确预测7075板材的塑性流动行为，预测数据与试验数据之间的Spearman相关系数达到0.997 7，均方误差小于13.2。所构建的改进型Arrhenius模型为7075-H18铝合金板材热成形数值模拟提供准确的材料本构模型。

关键词: 7075-H18铝合金, 热成形, 塑性流动行为, 本构模型, 数值模拟

Abstract: In order to support the design of hot forming technology and the tooling die development of 7075 high-strength aluminum alloy sheet, by taking the 7075-H18 sheet suitable for continuous hot forming as the research object, a systematical study on the hot-stretching plastic flow characteristics of the 7075 sheet under hot forming conditions is carried out by virtue of Gleeble-3800 thermal simulation system, and an improved Arrhenius constitutive model is established based on the experimental data. The hot-stretching test results showed that the flow behaviors of the 7075 sheets are sensitive to deformation temperature and strain rate. Within the selected temperature range (300- 450 ℃) and strain rate range (0.001-10 s^-1), the plastic flow stress of the sheet decreased significantly with the increase of deformation temperature or the decrease of strain rate, and the elongation after fracture increased with the increase of deformation temperature or strain rate. The improved Arrhenius model could accurately predict the plastic flow behavior of the 7075 sheets. The Spearman correlation coefficient for the predicted data and experimental data could reach 0.9977, and the mean square error is less than 13.2. The improved Arrhenius model provides an accurate material constitutive model for the numerical simulation of 7075-H18 aluminum alloy sheet in hot forming process.

Key words: 7075-H18 aluminum alloy, hot forming, plastic flow behavior, constitutive model, numerical simulation

中图分类号:

TG389

王刚, 谷诤巍, 于歌, 李欣. 热成形工艺条件下7075-H18铝合金板材塑性流动行为的本构建模[J]. 机械工程学报, 2024, 60(2): 188-196.

WANG Gang, GU Zhengwei, YU Ge, LI Xin. Plastic Flow Behavior and Constitutive Model of 7075-H18 Aluminum Alloy Sheet Based on Hot Forming Process[J]. Journal of Mechanical Engineering, 2024, 60(2): 188-196.

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热成形工艺条件下7075-H18铝合金板材塑性流动行为的本构建模

Plastic Flow Behavior and Constitutive Model of 7075-H18 Aluminum Alloy Sheet Based on Hot Forming Process

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