锻压技术

高应变速率下TA1纯钛薄板的J-C本构及失效模型研究

英文标题：Research on J-C constitutive and failure models for TA1 pure titanium sheet under high strain rate

作者：黄艺帆1 2 董芃欣1 2 吴泽霖1 2 曹全梁1 2 谌祺1 2 韩小涛1 2

单位：1. 华中科技大学国家脉冲强磁场科学中心 2. 华中科技大学强电磁工程与新技术国家重点实验室

分类号：TG146

出版年,卷(期):页码：2023,48(3):236-243

摘要：

为探究TA1纯钛的动态力学性能，对0.5 mm厚度的TA1纯钛薄板试样进行了准静态以及不同应变速率下的动态拉伸实验，建立了能够真实反映TA1纯钛在高应变速率和较大应变范围内的塑性变形特征的Johnson-Cook（J-C）本构模型，并对原始模型进行了修正；同时，对不同缺口半径的TA1纯钛拉伸试样进行了准静态拉伸实验，建立了基于应力三轴度的失效模型。将建立的J-C本构与失效模型应用于LS-Dyna中进行仿真模拟，并与实验数据对比，验证了模型的有效性与实用性。

In order to explore the dynamic mechanical properties of TA1 pure titanium, the quasi-static and dynamic tensile experiments of TA1 pure titanium sheet samples with the thickness of 0.5 mm under different strain rates were carried out, the Johnson-Cook (J-C) constitutive model truly reflecting the plastic deformation characteristics of TA1 pure titanium in high strain rate and large strain range was established, and the original model was modified. Meanwhile, the quasi-static tensile experiments were carried out on TA1 pure titanium tensile samples with different notch radii, and the failure model based on stress triaxiality was established. The established J-C constitutive and failure models were applied to LS-Dyna for simulation, and the validity and practicability of the model were verified by comparing with the experimental data.

基金项目：

国家自然科学基金资助项目（52077092）；湖北省重点研发项目（2021BAA174）

作者简介：黄艺帆 (1996-),男，硕士研究生 E-mail：cris@hust.edu.cn 通信作者：韩小涛 (1974-),男，博士，教授 E-mail：xthan@mail.hust.edu.cn

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