首页|自然时效态2198铝锂合金板材各向异性晶体塑性有限元模拟

自然时效态2198铝锂合金板材各向异性晶体塑性有限元模拟

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基于电子背散射衍射(EBSD)数据建立了自然时效态2198铝锂合金板材的晶体塑性有限元模型,并利用控制变量法研究了5个塑性基本参数(初始硬化模量、应变率敏感系数、参考应变率、初始临界分剪切应力和饱和流动应力)对塑性变形行为的影响,通过引入代价函数,并对各个塑性参数进行优化,最终得到了能够描述自然时效态2198铝锂合金板材各向异性的塑性参数,所预测的沿RD和TD方向的应力-应变曲线与试验结果符合较好.通过晶体塑性有限元法,预测了自然时效态2198铝锂合金板材单向拉伸过程中晶体取向演变与12个滑移系对塑性变形的贡献.发现(111)[10-1]滑移系对自然时效态2198铝锂合金板材单向拉伸的塑性变形贡献最大.沿RD方向拉伸时,自然时效态2198铝锂合金板材出现强烈的[011]//TD织构.
Crystal plastic finite element simulation of anisotropy in natural aged 2198 Al-Li alloy sheet
The crystal plastic finite element model of natural aged 2198 Al-Li alloy sheet was established based on electron back scattering diffraction(EBSD)data,and the effects of five basic plastic parameters(initial hardening modulus,strain rate sensitivity coefficient,ref-erence strain rate,initial critical shear stress,saturated flow stress)on the plastic deformation behavior were studied by using the control variable method.By introducing the cost function and optimizing each plastic parameter,the plastic parameters which can describe the an-isotropy of the natural aged 2198 Al-Li alloy sheet were obtained.The predicted stress-strain curves along RD and TD directions are in good agreement with the test results.The crystal orientation evolution and the contribution of 12 slip systems to the plastic deformation of natural aged 2198 Al-Li alloy sheet during unidirectional tensile process were predicted by means of crystal plastic finite element method.It is found that(111)[10-1]slip system contributes the most to the unidirectional tensile plastic deformation of the natural aged 2198 Al-Li alloy sheet.The natural aged 2198 Al-Li alloy sheet has a strong[011]//TD texture when stretched along RD.

2198 Al-Li alloycrystal plastic finite element methodmaterial parameteranisotropycrystallographic textureslip system

上官赞鹏、严天建、张帅、加浩、胡民亢、赵天章

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沈阳航空航天大学航空宇航学院,辽宁沈阳 110135

沈阳飞机工业(集团)有限公司,辽宁沈阳 110034

沈阳航空航天大学航空制造工艺数字化国防重点学科实验室,辽宁沈阳 110136

2198铝锂合金 晶体塑性有限元法 材料参数 各向异性 晶体取向演变 滑移系

国家自然科学基金资助项目国家级大学生创新创业训练项目沈阳市中青年科技创新人才支持计划

51605310D202303292056259031RC210422

2024

10.3969/j.issn.1007-2012.2024.06.014

塑性工程学报
中国机械工程学会

塑性工程学报

CSTPCD北大核心
影响因子：0.46
ISSN：1007-2012
年,卷(期)：2024.31(6)
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