3004铝的动态力学性能及本构模型  

Dynamic mechanical behavior and constitutive model of 3004 aluminum

作　　者：王洪欣[1] 查晓雄[1] 

机构地区：[1]哈尔滨工业大学深圳研究生院土木与环境工程学院,广东深圳518055

出　　处：《华中科技大学学报（自然科学版）》2011年第5期39-42,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：深圳市科技计划资助项目(深港创新圈深科信(2009)37号)

摘　　要：为了得到3004铝的动态力学性能及本构模型,运用静态实验机和分离式Hopkinson压杆动态加载装置,在温度为10～400℃、应变率为0.000 5～2 000s-1范围内得到了3004铝在准静态拉伸及动态压缩条件下的应力-应变曲线,并基于Johnson-Cook材料模型对其进行拟合分析.结果表明:3004铝有明显的应变率强化效应和温度软化效应,其应力随应变率的增加而增加,随温度的升高而降低;拟合得到的3004铝动态本构关系曲线可以描述出材料在大应变率和高温下的力学性能.The static test system and split Hopkinson pressure bar （SHPB） were used to obtain the dynamic mechanical behaviors and constitutive model of 3004 aluminum. The stress-strain curves of 3004 aluminum were obtained in the range of strain rates from 0. 000 5 s^-1 to 2 000 s^-1 , and the temperatures from 10℃ to 400℃ under the quasi-static tension and dynamic compression. The parameters of Johnson-Cook model were also fitted according to the stress-strain curves. The Experimental resuits show that 3004 aluminum have a remarkable strain rate effect and temperature effect, the stress increases with strain rate increasing while decreases with temperature increasing. Dynamic constitutive model of 3004 aluminum fitted by experimental results can describe the dynamic mechanical behaviors under the high strain rate and high temperature.

关 键 词：3004铝 HOPKINSON压杆 动态本构关系 Johnson-Cook模型 应变率效应 温度效应 

分 类 号：TU512.4[建筑科学—建筑技术科学]