锻压技术

剪切修正GTN模型在拉剪变路径加载问题中的适用性

英文标题：Applicability of shear modified GTN model under variable path loading with tension and shearing

作者：王婷婷庄新村赵震

单位：上海交通大学

关键词：非比例加载 GTN模型应变路径断裂机理 AA2024铝合金

分类号：TG113.2

出版年,卷(期):页码：2017,42(5):133-140

摘要：

为评估含剪切修正项GTN模型在非比例加载条件下的适用性，以一组缺口圆棒试样的拉剪变路径加载试验结果为依据，运用有限元软件ABAQUS/Explicit模块及用户子程序VUMAT进行平行仿真分析。研究结果表明：在大预变形下的拉剪变路径加载条件下，增长的预应变会加快后续拉伸过程中孔洞的增长率，导致材料提前断裂。同时，结合断口宏观与微观形貌分析，研究了非比例加载过程材料的损伤演化机理。AA2024铝合金在拉剪变路径加载条件下的断裂机制为拉-剪混合断裂，随着预扭作用的增强，剪切断裂逐渐取代拉伸断裂成为主导的断裂模式。

In order to evaluate the applicability of the shear enhanced GTN damage model under non-proportional loading, based on a set of notched round bar tests results under torsion-tension variable path loading, a parallel simulation analysis was carried out by the ABAQUS/Explicit with VUMAT subroutine. The results show that under the condition of tension-torsion variable path loading with large pre-deformation, the growth of pre-strain speeds up the growth rate of voids in the subsequent tension process and results in the material fracture in advance. In addition, combining with the fracture macro and micro morphologies, the damage evolution mechanism under non-proportional loading process was investigated. The fracture mechanism of aluminum alloy AA2024 under the condition of tension-shear variable path loading is a tension-shear mixed fracture, and the shear fracture becomes the dominant fracture mode with the increasing pre-torsion.

基金项目：

国家自然科学基金资助项目（51105250）

王婷婷（1991-），女，硕士研究生庄新村（1980-），男，博士，副教授

参考文献：

［1］汤安民, 师俊平. 铝合金材料剪切断裂实验分析[J]. 力学季刊, 2002, 23(1):82-86. Tang A M, Shi J P. Experiment analysis for shear break of aluminum alloy material[J]. Chinese Quarterly of Mechanics, 2002, 23(1):82-86.
［2］Batra R, Lear M. Adiabatic shear banding in plane strain tensile deformations of 11 thermoelastoviscoplastic materials with finite thermal wave speed[J]. International Journal of Plasticity, 2005, 21(8):1521-1545.
［3］Agarwal H, Gokhale A, Graham S, et al. Void growth in 6061-aluminum alloy under triaxial stress state[J]. Materials Science and Engineering, 2003, 341(1):35-42.
［4］刘倩，韩静涛，刘靖，等.韧性断裂准则及损伤模型在冲裁有限元模拟中的应用研究[J]. 锻压技术，2015，40(6):28-33.Liu Q，Han J T，Liu J，et al. Research on the application of ductile fracture criteria and damage models in finite element simulation of blanking process [J]. Forging & Stamping Technology, 2015, 40(6):28-33.
［5］Gurson A L. Continuum theory of ductile rupture by void nucleation and growth: Part I-Yield criteria and flow rules for porous ductile media[J]. Journal of Engineering Materials & Technology, 1977, 99(1):297-300.
［6］Tvergaard V, Needleman A. Analysis of the cup-cone fracture in a round tensile bar[J]. Acta Metallurgica, 1984, 32(1):157-169.
［7］Needleman A, Tvergaard V. An analysis of ductile rupture in notched bars[J]. Journal of the Mechanics & Physics of Solids, 1984, 32(6):461-490.
［8］Nahshon K, Hutchinson J W. Modification of the Gurson model for shear failure[J]. European Journal of Mechanics-A/Solid, 2008, 27(1):1-17.
［9］Xue L. Ductile Fracture Modeling: Theory, Experimental Investigation and Numerical Verification[D]. Cambridge: Massachusetts Institute of Technology, 2009.
［10］朱险锋，王婷婷，庄新村，等.应变路径变化对材料韧性断裂的影响[J]. 锻压技术, 2016, 41（6）：122-127.Zhu X F，Wang T T，Zhuang X C，et al. Influence of strain path change on material ductile fracture [J]. Forging & Stamping Technology, 2016, 41(6):122-127.
［11］Zhuang X C, Wang T, Zhu X, et al. Calibration and application of ductile fracture criterion under non-proportional loading condition[J]. Engineering Fracture Mechanics, 2016,165:39-56.
［12］方勇勇, 庄新村, 赵震，等. 基于试验与模拟的修正GTN模型参数反求分析[J].上海交通大学学报，2016，50(7):1011-1016.Fang Y Y, Zhuang X C, Zhao Z, et al. Parameter identification of enhanced GTN model through experiments and simulation[J]. Journal of Shanghai Jiaotong University, 2016, 50(7):1011-1016.
［13］Oh C K, Kim Y J, Baek J H, et al. A phenomenological model of ductile fracture for API X65 steel[J]. International Journal of Mechanical Sciences, 2007, 49(12):1399-1412.

服务与反馈：

【文章下载】【加入收藏】