摘要
基于ABAQUS/Explicit有限元平台,以有限元仿真为主,并结合室温下的准静态拉伸试验,研究了应力三轴度对7075铸态铝合金断裂应变的影响,建立了可靠的7075铸态铝合金单向拉伸断裂预测模型,进而采用正交回归分析建立了7075铸态铝合金断裂应变与应力三轴度的关系模型。结果表明,在室温下,单向拉伸速率为0.004 mm·s^（-1）时,每个试样在缺口处断裂应变最大,而应力三轴度最小;在断裂临界点,缺口处的应变随着缺口半径R的增大逐渐增大,由缺口处向两端逐渐减小;应力三轴度随着缺口半径R的增大逐渐减小,且由缺口处向两端逐渐增大;7075铸态铝合金断裂应变随着应力三轴度的增大而减小;断裂应变与应力三轴度成反比例关系。
Mainly used the finite element simulation and combined with the quasi-static tensile test at room temperature,the influence of stress triaxiality on fracture strain of 7075 as-cast aluminum alloy was carried out based on ABAQUS/Explicit platform. A reliable fracture prediction model for unidirectional tensile of 7075 as-cast aluminum alloy was established. Then the relationship model between fracture strain of 7075 as-cast aluminum alloy and stress triaxiality was established by orthogonal regression analysis. The results show that at room temperature,specimen has the maximum fracture strain and the smallest stress triaxiality at the notch when the unidirectional tensile rate is 0. 004 mm·s^（-1）. At the fracture critical point,the strain at the notch increases with the increase of the notch radii,and gradually decreases from the notch to the both ends. However,the stress triaxiality decreases with the increase of notch radii,and gradually increases from the notch to the both ends. The fracture strain of 7075 as-cast aluminum alloy decreases with the increase of the stress triaxiality,the fracture strain is inversely proportional to stress triaxiality.
作者
赵刚要
杨胜金
张冉阳
郭正华
郭伟
康春爽
ZHAO Gang-yao;YANG Sheng-jin;ZHANG Ran-yang;GUO Zheng-hua;GUO Wei;KANG Chun-shuang(School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nangchang 330063;Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK;Beijing Institute of Aeronautical Materials, Beijing 100095, China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2018年第1期192-198,共7页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51165037、51665041)
国家留学基金委项目资助(201708360119)
关键词
7075铸态铝合金
准静态拉伸试验
断裂应变
应力三轴度
回归分析
7075 as-cast aluminum alloy
quasi-static tensile test
fracture strain
stress triaxiality
regression analysis
