摘要
分别利用液压试验机和分离式霍普金森压杆试验装置对38CrMoAl高强度钢进行低应变速率(10^(-4),10^(-3),10^(-2) s^(-1))下的准静态压缩试验和高应变速率(850~4 500 s^(-1))下的动态压缩试验,研究了该钢的动态压缩力学性能以及动态压缩后的显微组织;考虑应变速率强化效应和绝热效应对Johnson-Cook(J-C)本构模型进行修正,并进行了试验验证。结果表明:试验钢的真实屈服强度随着压缩应变速率的增加而增大,表现出应变速率强化效应;经高应变速率压缩后,试验钢中出现了具有一定耐蚀性的强化区;修正后的J-C本构模型预测得到试验钢在不同应变速率下的真应力与试验结果的平均相对误差范围为1.76%~3.99%,这表明修正后的J-C本构模型能够准确地描述该钢的动态压缩力学特性。
Quasi-static compression at low strain rates(10^(-4), 10^(-3), 10^(-2) s^(-1)) and dynamic compression at high strain rates(850-4 500 s^(-1)) were conducted on 38 CrMoAl high strength steel with a hydraulic testing machine and a split Hopkinson pressure bar test device. The dynamic compressive mechanical properties of the steel and the microstructure after dynamic compression were studied. Considering the strain rate enhancement effect and adiabatic effect, the Johnson-Cook(J-C) constitutive model was modified, and was verified by experiments. The results show that the true yield strength of the test steel increased with the increase of the compressive strain rate, indicating an obvious strain rate enhancement effect. After compression at high strain rates, the strengthening zone with certain corrosion resistance appeared in the microstructure of the test steel. The average relative errors between the prediction by the modified J-C constitutive model and the experimental values of the true stresses were 1.76%-3.99%, indicating that the modified J-C constitutive model could describe the dynamic compressive mechanical properties of 38 CrMoAl steel accurately.
作者
包志强
张勇
张柱柱
樊伟杰
孟莉莉
BAO Zhiqiang;ZHANG Yong;ZHANG Zhuzhu;FAN Weijie;MENG Lili(Naval Aviation University Qingdao Campus,Qingdao 266041,China;AVIC Manufacturing Technology Institute,Beijing 100024,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2021年第5期76-83,共8页
Materials For Mechanical Engineering
基金
山东省高等院校“青创科技计划”资助项目(2020KJA014)。
