通孔泡沫铝合金的动态压缩力学性能研究  

Dynamic Compressive Mechanical Behavior of Porous Aluminum Alloy

作　　者：张立勇[1] 薛国宪[1] 程和法[1] 许玲[2] 

机构地区：[1]合肥工业大学,合肥230009 [2]安徽工程科技大学,安徽芜湖241000

出　　处：《有色金属》2004年第41期21-24,共4页Nonferrous Metals

基　　金：安徽省自然科学基金资助项目 (0 3 0 44 60 2 )

摘　　要：采用MTS810 2 3型万能材料试验机和分离式Hopkinson压杆 (SHPB)设备对加压渗流法制备的通孔泡沫铝合金进行了不同应变率下的准静态和动态压缩试验 ,以研究通孔泡沫铝的动态力学性能。得出了通孔泡沫铝合金的压缩应力 应变曲线。结果表明 ,不同应变率下的压缩σ ε曲线均分为线弹性、塑性变形和密实 3个阶段。通孔泡沫铝合金表现出明显的应变率效应 ,其屈服应力和流动应力随应变率的提高而上升。动态压缩下 ,通孔泡沫铝的屈服应力随相对密度的增大而升高 ,且其比强度与相对密度的 1 5次幂呈线性关系。The quasi-static and dynamic compression tests with MTS810.23 material test de vi ce and Split Hopkinson pressure bar equipment on specimens made by infiltration method under different strain rate are conducted to study the dynamic mechanical behavior of porous aluminum alloy respectively. The compression stress-strain c urves of porous aluminum alloy are obtained. The stress-strain curves under di ff erent strain rate are divided into three regions: linear elastic region, plastic collapsing region and densification region. The strain-rate effect is signifi ca ntly presented in the porous aluminum alloy, and the yield strength and fluid st rength of porous aluminum alloy are increased with the increase of strain rate. Under dynamic compression, the yield strength is increased with the increase of relative density and the relative strength is in direct proportion with the 1.5 order power of the relative density

关 键 词：泡沫铝合金 动态压缩 流动应力 通孔 应变率 塑性变形 力学性能 准静态 升高 比强度 

分 类 号：TG146[一般工业技术—材料科学与工程] TN405[金属学及工艺—金属材料]