RESEARCH ON THE RELATIONSHIP BETWEEN FRACTURE STRAIN AND TRIAXIALITY OF 6061-T6 ALUMINUM ALLOY

YI HaiJiao; ZHEN Ying; CAO YuGuang; ZHANG ShiHua; SHI YongJin

doi:10.16579/j.issn.1001.9669.2020.03.007

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RESEARCH ON THE RELATIONSHIP BETWEEN FRACTURE STRAIN AND TRIAXIALITY OF 6061-T6 ALUMINUM ALLOY

更新时间：2022-09-22

- RESEARCH ON THE RELATIONSHIP BETWEEN FRACTURE STRAIN AND TRIAXIALITY OF 6061-T6 ALUMINUM ALLOY
- Journal of Mechanical Strength Vol. 42, Issue 3, Pages: 551-558(2020)
- 作者机构：
  
  1. 中国石油大学(华东)山东省油气储运安全重点实验室
  2. 机械结构强度与振动国家重点实验室
  3. 中石化胜利石油工程有限公司钻井工艺研究院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2020.03.007
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YI HaiJiao, ZHEN Ying, CAO YuGuang, et al. RESEARCH ON THE RELATIONSHIP BETWEEN FRACTURE STRAIN AND TRIAXIALITY OF 6061-T6 ALUMINUM ALLOY. [J]. 42(3):551-558(2020)
DOI：

YI HaiJiao, ZHEN Ying, CAO YuGuang, et al. RESEARCH ON THE RELATIONSHIP BETWEEN FRACTURE STRAIN AND TRIAXIALITY OF 6061-T6 ALUMINUM ALLOY. [J]. 42(3):551-558(2020) DOI： 10.16579/j.issn.1001.9669.2020.03.007.

摘要

研究材料断裂应变与应力三轴度的关系,从而建立其断裂失效模型,对分析6061-T6铝合金断裂失效过程具有重要理论意义和应用价值。分别借助数字图像相关(DIC)测量技术和Abaqus软件对6061-T6铝合金光滑圆棒试件与缺口圆棒试件准静态拉伸过程进行试验和数值模拟,基于所得结果对后者应力三轴度进行分析和修正,从而得到Johnson-Cook(J-C)失效模型的部分材料参数,并建立了6061-T6铝合金断裂应变与应力三轴度的关系模型。将建立的失效模型输入到Abaqus中进行断裂数值模拟,模拟结果与试验结果基本一致,验证了失效模型的正确性。研究表明:6061-T6铝合金的断裂应变随应力三轴度的增加而减小;采用J-C失效模型可以较好的描述6061-T6铝合金在不同应力三轴度下的断裂失效行为。

Abstract

It has important theoretical significance and application value for analyzing the fracture failure process of 6061-T6 aluminum alloy to study the relationship between fracture strain and stress triaxiality and establish the fracture failure model. The quasi-static tensile tests and numerical simulations of 6061-T6 aluminum alloy smooth bar specimens and notched bar specimens were carried out by means of digital image correlation（ DIC） measurement technique and Abaqus software,respectively. The stress triaxiality of the latter was analyzed and corrected based on the results obtained,and a part of the Johnson-Cook（ J-C）failure model was obtained. The relationship between the fracture strain and the stress triaxiality of 6061-T6 aluminum alloy was established. The failure model was input into Abaqus for fracture numerical simulation. The simulation results were basically consistent with the experimental results,which verified the correctness of the failure model. It’s shown that the fracture strain of6061-T6 aluminum alloy decreases with the increase of stress triaxiality,and the J-C failure model can well describe the fracture failure behavior of 6061-T6 aluminum alloy under different stress triaxiality.

关键词

6061-T6铝合金应力三轴度断裂失效J-C失效模型DIC测量技术

Keywords

6061-T6 aluminum alloyStress triaxialityFracture strainJ-C failure modelDIC measurement technique

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