摘要
板料成形的仿真精度主要取决于描述材料塑性变形特征的塑性本构关系。而塑性本构关系的预测能力则是由在不同应力状态下所获得的实验数据所定义。用于描述板材塑性变形特性的实验数据包括初始屈服、后续强化以及各向异性塑性变形参数等。为了应用不同的实验数据来恰当地表征仿真所用的材料模型,首先需要了解仿真成形零件的主要加载应力特性;其次需要合理应用由不同实验方法所获得的实验数据,使所定义的材料塑性本构模型能够充分反映出材料在整个均匀塑性变形过程中所表现出的材料强化与塑性变形特性,而非局部区域或者某一特定点处的实验特性。分析了应用不同实验数据定义仿真材料塑性本构关系对模拟结果所产生的不同影响。提出在应用材料的一些特殊实验结果时,除了需要考虑选择不同的流动准则,还需要考虑所涉及的塑性本构关系是否可以充分揭示出材料所对应的实验特性。
The simulation accuracy of sheet metal forming mainly depends on the plastic constitutive relation which describes the plastic deformation characteristics of the material,while the predictive ability of the plastic constitutive relation is defined by the experimental data obtained under different stress states. The experimental data used to describe the plastic deformation properties of sheet metal includes the parameters of initial yield,the subsequent hardening and the anisotropic plastic deformation parameters. To apply different experimental data to appropriately characterize the model used in the simulation,first of all,it needs to clearly understand the main loading stress characteristics of the simulation forming part;then,the experimental data obtained by different experiment methods needs to be reasonable applied to make the difined material plastic constitutive model can fully reflect the hardening and plastic deformation characteristics of the materials during the whole process of uniform plastic deformation,rather than those of local regions or just a certain characteristic point of a whole test. The influence of plastic constitutive relation of the simulated material defined using different experimental data on simulation results was analyzed. It is proposed that in the application of some special experimental results of the materials,in addition to need to consider the selection of different flow criteria,but also need to consider whether the plastic constitutive relations involved can fully reveal the experimental properties of the materials.
作者
连昌伟
吕超
胡卫龙
LIAN Chang-wei;LV Chao;HU Wei-long(R&D Center,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China;State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel),Shanghai 201900,China;School of Mechanical Engineering,Tongji University,Shanghai 201804,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第11期1-11,共11页
Journal of Plasticity Engineering
基金
国家重点研发计划项目(2017YFB0304403)。
关键词
单拉实验
双拉实验
纯剪切实验
拉-剪实验
拉-压实验
仿真材料模型
uniaxial tension test
bi-axial tension test
pure shear test
tension-shearing test
tension-compression test
simulation constitutive model
