基于修正Johnson-Cook模型的钛合金热黏塑性动态本构关系及有限元模拟
发布时间：2018-11-25 17:39
【摘要】：为了准确描述钛合金在高应变率、高温载荷下的热粘塑性本构行为,以及因材料内部出现绝热剪切带而导致材料流变应力减小的定量关系,构造功热转换系数β与应变率?(5)之间的函数关系,提出一种基于修正Johnson-Cook模型的钛合金热粘塑性动态本构关系,并通过以最小二乘法为目标函数的局部搜索优化算法,对基于实验数据的本构参数进行快速优化识别。最后利用应力补偿更新算法,通过显式用户子程序VUMAT将热黏塑性本构模型嵌入ABAQUS软件中,得到Ti-6Al-4V钛合金在不同应变率、温度条件下的单轴动态应力-应变曲线。数值模拟结果与实验数据吻合良好,表明该修正模型能准确描述钛合金高应变率下的热黏塑性变形,可适用于各种应变率下钛合金本构行为的描述。
[Abstract]:In order to accurately describe the thermal viscoplastic constitutive behavior of titanium alloy under high strain rate and high temperature load, and the quantitative relationship between the flow stress and the internal adiabatic shear band. Based on the modified Johnson-Cook model, a dynamic constitutive relation of thermal viscoplasticity of titanium alloys is proposed. The local search optimization algorithm based on the least square method is used to optimize the relationship between the coefficient of power and heat transfer and the strain rate? (5). The constitutive parameters based on experimental data are quickly optimized and identified. Finally, the thermo-viscoplastic constitutive model is embedded into the ABAQUS software by the explicit user subprogram VUMAT, and the uniaxial dynamic stress-strain curves of Ti-6Al-4V titanium alloy at different strain rates and temperatures are obtained by using the stress compensation update algorithm. The numerical simulation results are in good agreement with the experimental data, which indicates that the modified model can accurately describe the thermo-viscoplastic deformation of titanium alloys at high strain rate, and can be used to describe the constitutive behavior of titanium alloys at various strain rates.
【作者单位】： 四川大学建筑与环境学院;中国工程物理研究院总体工程研究所;
【基金】：国家自然科学基金委与中国工程物理研究院NSAF联合基金资助项目(B1520132013-1)~~
【分类号】：TG146.23
本文编号：2356912
[Abstract]:In order to accurately describe the thermal viscoplastic constitutive behavior of titanium alloy under high strain rate and high temperature load, and the quantitative relationship between the flow stress and the internal adiabatic shear band. Based on the modified Johnson-Cook model, a dynamic constitutive relation of thermal viscoplasticity of titanium alloys is proposed. The local search optimization algorithm based on the least square method is used to optimize the relationship between the coefficient of power and heat transfer and the strain rate? (5). The constitutive parameters based on experimental data are quickly optimized and identified. Finally, the thermo-viscoplastic constitutive model is embedded into the ABAQUS software by the explicit user subprogram VUMAT, and the uniaxial dynamic stress-strain curves of Ti-6Al-4V titanium alloy at different strain rates and temperatures are obtained by using the stress compensation update algorithm. The numerical simulation results are in good agreement with the experimental data, which indicates that the modified model can accurately describe the thermo-viscoplastic deformation of titanium alloys at high strain rate, and can be used to describe the constitutive behavior of titanium alloys at various strain rates.
【作者单位】： 四川大学建筑与环境学院;中国工程物理研究院总体工程研究所;
【基金】：国家自然科学基金委与中国工程物理研究院NSAF联合基金资助项目(B1520132013-1)~~
【分类号】：TG146.23
【相似文献】
相关期刊论文 前2条
1 温崇哲，陈栋梁，许志强;连铸过程铸坯弹／黏塑性热应力的研究[J];力学与实践;1994年05期
2 刘宇杰,蔡力勋,杨显杰,牛清勇;描述1Cr18Ni9Ti不锈钢单轴棘轮行为的黏塑性本构模型[J];航空学报;2005年01期
，本文编号：2356912
本文链接：https://www.wllwen.com/kejilunwen/jiagonggongyi/2356912.html
