高强38CrSi钢力学性能测试及本构关系研究  

Mechanical property tests and the constitutive relation of high strength 38CrSi steel

作　　者：魏刚[1] 张伟[2] 邓云飞[1] WEI Gang;ZHANG Wei;DENG Yunfei(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;High Velocity Impact Dynamics Lab,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]中国民航大学航空工程学院,天津300300 [2]哈尔滨工业大学航天学院高速撞击动力学实验室,哈尔滨150001

出　　处：《振动与冲击》2019年第18期179-184,共6页Journal of Vibration and Shock

基　　金：中国民航大学科研启动基金(2015QD01S);国家自然科学青年基金(11702317);国家自然科学面上基金(11072072)

摘　　要：使用万能材料试验机、霍普金森拉杆(SHTB)和Taylor杆撞击试验研究了淬火加中温回火处理的高强38CrSi钢在常温~700℃的准静态、动态力学性能。基于试验数据,对Johnson-Cook(J-C)本构模型中的温度软化项做了轻微修改。结合Taylor杆撞击试验反算,得到了修改的J-C本构相关参数和Cockroft-Latham(C-L)断裂准则的模型参数。通过对高速下Taylor杆撞击试验中弹体变形和断裂的数值仿真与试验结果的比较,验证了模型及参数对预测高强38CrSi钢动态大变形和断裂的有效性。The quasi-static and dynamic mechanical behaviors of high strength 38CrSi steel with medium temperature tempering after quenching were investigated using a universal testing machine and a split Hopkinson tension bar(SHTB)for doing the Taylor impact test.The temperature range from room temperature to 700°C was involved.The Johnson-Cook(J-C)constitutive relation with a slight modification on the temperature softening item was proposed to fit the test results.The modified parameters of the J-C constitutive model and Cockroft-Latham(C-L)fracture criterion were identified by fitting the experimental data,based on the combination of the numerical simulation results of Taylor impact test and the conditions of mushrooming and cracking.The parameters were validated by comparising the deformation and fracture results by the Taylor tests and the simulations with higher impact velocity.The consistency between experimental observations and numerical simulations indicates that the models and parameters obtained are competent to describe the dynamic large deformations and fracture behaviors of high strength 38CrSi steel.

关 键 词：力学性能测试 高强38CrSi钢 Johnson-Cook本构模型 Cockroft-Latham断裂准则 

分 类 号：O347.3[理学—固体力学]