刘立熙,郑清丽,朱健,李志强.应力三轴度和罗德参数对铝合金材料韧性断裂的影响[J].稀有金属材料与工程,2019,48(2):433~436.[Liu Lixi,Zheng Qingli,Zhu Jian,Li Zhiqiang.Effects of Stress Triaxiality and Lode Parameter on Ductile Fracture in Aluminum Alloy[J].Rare Metal Materials and Engineering,2019,48(2):433~436.]
应力三轴度和罗德参数对铝合金材料韧性断裂的影响
投稿时间:2017-06-27  修订日期:2018-08-24
中文关键词:  应力三轴度  失效应变  罗德参数  断口形貌
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      大量理论与实验研究表明,应力三轴度对韧性断裂有重要影响。然而,最近的研究表明,与应力偏张量第三不变量相关的罗德参数也是影响韧性断裂一个重要因素。本文采用7075铝合金制成的缺口圆棒和凹槽平板试样来研究应力三轴度和罗德参数对韧性断裂的影响及相应的微观机理。通过准静态拉伸实验和数值模拟得到应力三轴度、罗德参数及失效轨迹。同时利用扫描电镜试验分析了不同应力状态下的空穴演化规律。结果表明,应力三轴度和罗德参数对破坏应变有重要影响。并且罗德参数的影响随着应力三轴度的增加而降低。断口形貌显示,随着应力三轴度的增加,孔洞的尺寸减小,不同罗德参数下的空穴形态有明显不同。二级孔洞的成核速率和生长程度也受到罗德参数的影响。
Effects of Stress Triaxiality and Lode Parameter on Ductile Fracture in Aluminum Alloy
英文关键词:stress triaxiality  failure strain  Lode parameter  fractography
英文摘要:
      Many theoretical and experimental studies showed that stress triaxiality has an important influence on ductile fracture. However, recent studies showed that Lode parameter, which can be linked to normalized third stress invariant, is also an essential factor. In the present study, round notched bar and flat grooved plate specimens made of 7075 aluminum alloy were used to assess the effect of stress triaxiality and Lode parameter on ductile fracture and on theScorresponding microscopicSmechanism. Quasi-static tensile experiments and parallel numerical simulations were conducted to obtain stress triaxiality, Lode parameter and failure locus. A fractographical analysis was performed to determine the rules of void evolution under different stress states. Stress triaxiality and Lode parameter have an important influence on failure strain. The effect of Lode parameter decreased with the increases in stress triaxiality. The fractographs showed that the size of the void decreased with the increase of stress triaxiality, and the morphologies of the voids of different Lode parameters were obviously different. TheSnucleation rate and growth degree of secondary voids were also affected by Lode parameter.
作者单位E-mail
刘立熙 太原理工大学 应用力学与生物医学工程研究所 liulixi1991@163.com 
郑清丽 太原理工大学 应用力学与生物医学工程研究所  
朱健 太原理工大学力学学院  
李志强 太原理工大学 应用力学与生物医学工程研究所  
摘要点击次数: 97
全文下载次数: 66
查看全文  查看/发表评论  
关闭