压缩剪切平面应变试样的应力状态响应  

Stress state response of compresive shear plane strain specimens

作　　者：赵宁 许镱巍 赵小松 白峭峰[1] 王琛 赵春江[1,2] ZHAO Ning;XU Yi-wei;ZHAO Xiao-song;BAI Qiao-feng;WANG Chen;ZHAO Chun-jiang(School of Mechanical and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Intelligent Manufacturing Industry College,Shanxi Electronic Science and Technology Institute,Linfen 041000,China)

机构地区：[1]太原科技大学机械工程学院,山西太原030024 [2]山西电子科技学院智能制造产业学院,山西临汾041000

出　　处：《塑性工程学报》2024年第7期188-194,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52275358);山西省重点研发计划项目(202202050201017)。

摘　　要：为模拟金属塑性变形过程中的压缩剪切应力状态的平面应变特征,构建了平面压缩剪切试样。通过数字图像相关(DIC)技术和有限元模拟表征变形区Y方向的应力状态分布特征及压缩断裂过程。DIC结果显示,在压缩实验过程中,变形区的应变场分布与有限元结果吻合良好,有限元结果可靠。有限元结果表明,通过改变试样的缺口倾角,可以定量控制应力三轴度的大小,并且主应变方向与缺口倾角方向一致。在变形区Y方向发生压缩剪切的平面应变,同时试样边缘位置相对于中心位置具有更低的Lode角参数,具有双向压缩加载特征,使得静水压力增大,应力三轴度进一步降低至-0.823。To simulate the plane strain characteristic of the compressive shear stress state in metal plastic deformation,a plane compressive shear specimen was constructed.The stress state distribution characteristics in the Y-direction of deformation zone and the compression fracture process were characterized by digital image correlation(DIC)technology and finite element simulation.DIC results show that the strain field distribution in deformation zone is in good agreement with the finite element results during the compression experiment process,and the finite element results are reliable.The finite element results show that the stress triaxiality can be controlled quantitatively by changing the notch dip angle of the specimen,and the principal strain direction is consistent with the notch dip angle direction.In the Y-direction of the deformation zone,compressive shear occurs within the plane strain.At the same time,the edge position of the sample has a lower Lode angle parameter compared with the central position,and has the characteristics of bidirectional compression loading,which increases the hydrostatic pressure and further reduces the stress triaxial degree to-0.823.

关 键 词：应力状态 平面应变 压缩剪切 数字图像相关 

分 类 号：TG301[金属学及工艺—金属压力加工]