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为了研究高强钢材料在动态加载过程中的力学响应,采用分离式霍普金森压杆对材料进行了不同应变率(3000到12000s-1)和不同温度(20℃到800℃)单轴压缩实验.实验结果表明:高强钢的动态力学行为受应变率和温度的强烈影响.流动应力随着应变率的升高而增加,随着温度的升高而降低.提出了一个经验型本构模型来描述材料的加工硬化和温度软化行为.该本构模型预测的应力——应变曲线与实验结构较好吻合,表明该本构模型可进一步用于高强钢动态变形过程的数值模拟研究.
In order to study the mechanical response of high-strength steel during dynamic loading, a uniaxial compression test was carried out at different strain rates (3000 to 12000s-1) and different temperatures (20 ℃ to 800 ℃) using split Hopkinson pressure bar The experimental results show that the dynamic mechanical behavior of high strength steel is strongly influenced by strain rate and temperature.The flow stress increases with the increase of strain rate and decreases with the increase of temperature.An empirical constitutive model Describing the work hardening and softening behavior of the material, the stress-strain curves predicted by the constitutive model are in good agreement with the experimental ones, which indicates that the constitutive model can be further applied to the numerical simulation of the dynamic deformation process of high strength steel.