铝青铜高速冲击载荷作用下的本构关系  

Constitutive relation of aluminum bronze in high speed impact loading

作　　者：李金泉[1] 张蕊[1] 郭海林[1] 

机构地区：[1]沈阳理工大学机械工程学院,辽宁沈阳110159

出　　处：《材料热处理学报》2016年第1期223-229,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51275317);沈阳理工大学"辽宁省先进制造技术与装备重点实验室"开放基金

摘　　要：以铝青铜QAl9-4为试验材料,根据分离式霍普金森压杆试验得到的数据,研究了铝青铜在高速冲击载荷作用下的Johnson-Cook(J-C)本构关系,根据高应变率变形下,部分塑性功转变为微孔洞等微观缺陷长大演化所需能量的观点,提出了一个同时依赖于应变率和应变的损伤因子,在J-C模型的基础上建立了考虑损伤的改进型J-C模型,研究损伤对材料性能的影响。结果表明,当损伤因子小于阈值时,损伤造成的应力变化可忽略不计,此时,J-C模型与试验曲线比较吻合,当损伤因子大于该阈值时,改进的J-C模型更符合材料的动态破坏特性。本研究扩大了J-C模型的适用范围。The Johnson-Cook（ J-C） constitutive relation of aluminum bronze（ QAl9-4） was studied with the experimental data by the split hopkinson pressure bar test. The damage factor depending on the strains and strain rates was proposed according to the thought that the energy for the development of micro defects is directly convert by the part of the plastic work of local plastic deformation. The modified JC model considering of the damage was established on the basis of J-C model to study the influence of damage on material performance.The results show that the effect of the damage on the stress can be negligible when the damage factor is less than the threshold value of the damage,and in this case,J-C model coincides well with the experimental curves,but the modified J-C model is more accordance with the experimental curve when the damage factor is greater than the threshold value of the damage. The application range of J-C model is extended by this research.

关 键 词：固体力学 本构关系 霍普金森压杆试验 铝青铜 

分 类 号：TG146.1[一般工业技术—材料科学与工程]