摘要
为了弥补18CrNiMo7-6合金钢动态力学性能及动态本构模型研究的不足,采用MTS伺服疲劳试验机、基于DIC的高温拉伸试验系统以及分离式霍普金森压杆(SHPB)装置,获取了该材料在不同应变率、温度下的应力-应变关系。结果表明:18CrNiMo7-6合金钢具有明显的应变率强化效应和温升软化特性。选用Johnson-Cook(J-C)本构模型描述18CrNiMo7-6合金钢的动态力学性能,基于试验数据,标定了该材料的J-C模型参数,并通过SHPB试验的有限元模拟验证了所得参数的可靠性。以应变硬化项和应变率强化项耦合的形式对J-C本构模型进行修正。修正后的模型与试验数据吻合程度更高,可为实际工程中的数值模拟问题提供参考。
In order to make up the insufficient research of the dynamic mechanical properties and dynamic constitutive model of 18CrNiMo7-6 alloy steel,using MTS servo fatigue testing machine,tensile test system at high temperature based on DIC and split Hopkinson pressure bar(SHPB),the stress-strain curves at different strain rates and temperatures were obtained.The results show that 8CrNiMo7-6 alloy steel has obvious strain rate strengthening effect and temperature rise softening properties.The Johnson-Cook(J-C)constitutive model was used to describe the dynamic mechanical properties of 18CrNiMo7-6 alloy steel.The J-C constitutive model parameters were determined by the experimental datas,and then the reliability of the parameters was verified by the numerical simulation of SHPB test.The strain hardening term and strain rate strengthening term were modified in the J-C constitutive model.The modified J-C constitutive model is in agreement with the experimental datas,which can provide a reference for numerical simulation in practical engineering.
作者
徐广涛
卢凤强
吴少洋
罗健
XU Guangtao;LU Fengqiang;WU Shaoyang;LUO Jian(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《热加工工艺》
北大核心
2023年第8期49-53,共5页
Hot Working Technology
基金
国家自然科学基金资助项目(11702252)
河南省高等学校青年骨干教师培养计划项目(2019GGJS005)。
