多晶体压剪试样静态加载有限元计算  

Finite Element Calculation of Polycrystalline Shear-Compression Specimens with Static Loading

作　　者：赵伟业 赵聃 吕品[1,2,3] 金涛 马胜国 ZHAO Weiye;ZHAO Dan;Lü Pin;JIN Tao;MA Shengguo(Institute of Applied Mechanics,School of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Shanxi Key Laboratory of Material Strength&Structural Impact,Taiyuan 030024,Shanxi,China;Taiyuan University of Technology Mechanics National Experimental Teaching Demonstration Center,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学机械与运载工程学院应用力学研究所,山西太原030024 [2]材料强度与结构冲击山西省重点实验室,山西太原030024 [3]太原理工大学力学国家级实验教学示范中心,山西太原030024

出　　处：《高压物理学报》2020年第2期89-99,共11页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11602158,11802199,11572214);山西省自然科学青年基金(201601D021026);山西省“1331工程”重点创新团队。

摘　　要：基于晶体塑性理论研究了晶体织构对数值计算结果的影响,建立了带有织构的多晶体压剪试样(SCS)模型。从材料和试样结构两方面研究了静态加载条件下微观晶粒在有限变形过程中对试样宏观力学性能的影响。由于模型几何结构的特殊性,重点对模型斜槽部分的应力、应变及变形特点进行了分析。考虑到试样在压缩过程中受摩擦的影响,数值分析了不同摩擦系数对变形过程的影响,在此基础上计算了相同摩擦系数下不同晶粒数目、不同单元数目以及单元类型对多晶体压剪模型力学性能的影响,并对试件关键部位不同取向晶粒的应力状态进行了分析。The effect of crystal texture on the numerical results was studied based on the theory of crystal plasticity,and the polycrystalline compression shear sample(SCS)model with texture was established.The influence of micro-grain on the macroscopic mechanical properties in the process of finite deformation under static loading condition was studied in terms of material and sample structure.Because of the particularity of model geometry,the stress,strain and deformation characteristics of skewed slot were computed.Considering the effect of friction on the specimen during compression,the influence of friction coefficients on the deformation process was analyzed numerically.The influences of grain number,element number and element type on the mechanical properties of polycrystalline compression shear model under the same friction coefficient were calculated.The stress states of grain with different orientations in key parts of the specimen were also studied.

关 键 词：多晶体 晶体织构 晶体塑性 压剪 摩擦系数 

分 类 号：O344.1[理学—固体力学]