摘要
本构模型的结构形式和应用实验数据的方式与能力是影响仿真预测精度最为关键的因素,只有清楚本构模型的现状,发现可能影响到预测精度的潜在问题,才能使本构模型获得有效的改进和完善。目前,随着智能化技术在各行各业的兴起和应用,传统成形产业也必将迎来智能化的挑战,而仿真技术必将是智能化成形技术的一个主要组成部分。现有仿真模型和计算方法是否适应于未来智能化成形技术的应用要求,是非常值得讨论和研究的重要课题。为此,分析了现有本构模型的构建形式和基本预测特性,并基于目前所依托的基本理论概念讨论了现有本构关系(塑性应力-应变关系)存在的不足之处和需要完善的地方。在此基础上,进一步讨论了仿真本构模型对未来智能化成形技术发展所起的作用,以及可能会发生的根本性改变,特别是在仿真模型构建概念上的改变,即如何从采用传统的、固定形式的实验数据特性来描述任意加载状态的变形特性,发展到基于对包含任意加载状态的大数据处理结果再现出具体成形件的变形特性。
The structural form,the way and the ability to apply experimental data of constitutive models are the most critical factors in affecting the simulation prediction accuracy.Therefore,only by knowing the present situation of constitutive models and discovering the potential problems that may impact the prediction accuracy,the constitutive models can be effectively improved and perfected.At present,as the emergence and application of the intelligent technology in various industries,traditional forming industry also inevitably needs to face the challenge of intellectuallization,and simulation technology must be a major part of the intelligent forming technology.Then,whether existing simulation models and calculation methods are suitable for the application requirements of future intelligent forming technology is an important topic worthy of discussion and investigation.To this end,the construction forms and basic predictive characteristics of the existing constitutive models were analyzed,and based on the basic theoretical concept currently supported,some deficiencies of existing constitutive relations(plastic stress-strain relation)and the parts that need to be improved were discussed.On this basis,the effects of the simulation constitutive model on the development of intelligent forming technology,the fundamental changes that may occur,and especially the change in construction conception of the simulation model were further discussed.That is how to develop from using traditional experimental data with fixed loading states to describe the deformation characteristic involving arbitrary loading conditions to reproduce deformation characteristics of specific formed parts based on big data processing results consisting of arbitrary loading conditions.
作者
胡卫龙
HU Wei-long(Troy Design&Manufacturing Co.,MI 48239,USA)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2023年第2期1-15,共15页
Journal of Plasticity Engineering
关键词
本构模型
智能化成形技术
板材冲压成形
各向异性
数值计算
constitutive model
intelligent forming technology
sheet metal stamping
anisotropy
numerical calculation
