摘要
目的研究工业纯钛TA1脉冲电流辅助拉伸过程中的变形行为,建立多物理场耦合的本构模型。方法利用自行搭建的电脉冲辅助拉伸平台在应变速率0.001 s^(−1)条件下对工业纯钛TA1进行拉伸实验,获得该材料在不同电流密度和温度下的应力-应变曲线。基于实验结果建立电辅助拉伸本构模型。结果与未通入电流相比,当电流密度为0.00、34.28、40.00、45.71 A/mm^(2)时,材料的屈服强度分别下降了15.1%、36.6%、45.7%,抗拉强度分别下降了12.3%、27.1%、33.4%。脉冲电流引入的非热效应降低了材料的流动应力,表明了电辅助拉伸过程中非热效应的存在。基于J-C本构模型、Arrhenius双曲正弦本构模型和电磁场激发位错脱钉理论,考虑热效应和非热效应建立的TA1电辅助拉伸本构模型与实验结果的误差均小于6%。结论考虑变形温度、电流密度与应变建立了本构模型,该模型具有较高的预测精度,可以对TA1电辅助拉伸过程中的流变应力进行准确预测。
The work aims to study the deformation behavior of industrial pure titanium TA1 during pulsed current-assisted tensile process and establish a multi-physical field coupled constitutive model.Tensile experiments were carried out on indus-trial pure titanium TA1 at a strain rate of 0.001 s^(-1) by a self-built electric pulse-assisted tensile platform.The stress-strain curves of the material under different current densities and temperatures were obtained.Based on the experimental results,an elec-tric-assisted tensile constitutive model was established.With the increase of current density(0.00,34.28,40.00,45.71 A/mm^(2)),the yield strength of the material decreased by 15.1%,36.6%and 45.7%respectively and the tensile strength decreased by 12.3%,27.1%and 33.4%respectively,compared with the case without current.The non-thermal effect introduced by the pulsed current reduced the flow stress of the material,indicating the existence of the non-thermal effect during the electric-assisted ten-sile process.Based on the J-C constitutive model,Arrhenius hyperbolic sine constitutive model and the dislocation depinning theory excited by the electromagnetic field,considering the thermal and non-thermal effects,the established TA1 elec-tric-assisted tensile constitutive model was in good agreement with the experimental results,and the error of the finite element model was less than 6%.A constitutive model is established by considering the deformation temperature,current density and strain,which has a high prediction accuracy and can accurately predict the flow stress during the electrically-assisted tensile process of TA1.
作者
郑世龙
张宝
祖宇飞
付雪松
周文龙
陈国清
ZHENG Shilong;ZHANG Bao;ZU Yufei;FU Xuesong;ZHOU Wenlong;CHEN Guoqing(Liaoning Key Laboratory of Solidification Control and Digital Preparation Technology,School of Materials Science and Engineering,Dalian University of Technology,Liaoning Dalian 116085,China)
出处
《精密成形工程》
北大核心
2025年第8期25-34,共10页
Journal of Netshape Forming Engineering
基金
国家自然科学基金(U1908229,52075073)。
关键词
工业纯钛
电脉冲辅助成形
变形行为
本构方程
有限元仿真
industrial pure titanium
electric pulse-assisted forming
deformation behavior
constitutive equation
finite element simulation
