基于霍普金森压杆试验研究闭孔泡沫铝的动态压缩力学性能  

Dynamic Compressive Mechanical Properties of Closed Cell Aluminum Foam Based on Hopkinson Pressure Bar Test

作　　者：张晓忠 曾斌[1] 徐戎[1] 王静 金峰[3] ZHANG Xiaozhong;ZENG Bin;XU Rong;WANG Jing;JIN Feng(College of Mechanical Engineering,Hunan University of Arts and Science,Changde 415000,China;Xi'an Electric Furnace Institute Co.,Ltd.,Xi'an 710061,China;State Key Laboratory of Mechanical Structure Strength and Vibration,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]湖南文理学院机械工程学院,常德415000 [2]西安电炉研究所有限公司,西安710061 [3]西安交通大学,机械结构强度与振动国家重点实验室,西安710049

出　　处：《机械工程材料》2025年第4期69-74,共6页Materials For Mechanical Engineering

基　　金：湖南省高等学校应用特色学科项目(湘教通[2018]469);湖南省高校科技创新团队支持计划资助项目(湘教通[2019]379);湖南文理学院博士科研启动项目(18BSQD08)。

摘　　要：结合波形整形技术,根据弹长调试和整形器调试结果改进常规霍普金森压杆试验装置,研究了不同密度(0.48,0.61,0.70 g·cm^(-3))闭孔泡沫铝在应变速率150,700,1 400 s^(-1)下的动态压缩力学性能。结果表明:增加弹长可以在获得较大变形的同时实现应变速率的下降,故选用3 m长子弹与4 m长入射杆和透射杆;相比无整形器时,使用直径为20 mm的6层瓦楞纸板整形器后,试样波形持续时间和上升沿时间较长,且在208μs后就基本达到应力均匀性要求;随着应变速率增加或密度增加,闭孔泡沫铝的压溃应力、屈服强度和平台应力均增大,动静态屈服强度比与相对应变速率(相对于准静态应变速率0.001 s-1)成近似幂函数关系,呈现一定的应变速率效应。The conventional Hopkinson pressure bar test device was improved according to the results of missile length adjustment and shaper adjustment combined with waveform shaping technology.The dynamic compressive mechanical properties at strain rates of 150,700,1400 s^(-1) of closed cell foam aluminum with different densities(0.48,0.61,0.70 g·cm^(-3))were studied.The results show that increasing the missile length could achieve greater deformation and decrease the strain rate at the same time,so 3 m long bullet and 4 m long incident rod and transmission rod were selected.The waveform duration time and rising edge time of the sample after using a 6 layer corrugated board shaper with a diameter of 20 mm was longer compared with those without shaper,and the stress uniformity was basically achieved after 208µs.With the increase of strain rate or density,the compressive stress,yield strength and platform stress of closed cell foam aluminum increased.The ratio of dynamic yield strength to static yield strength was an approximate power function with the relative strain rate(relative to quasi-static strain rate of 0.01 s-1)showing a certain strain rate effect.

关 键 词：闭孔泡沫铝 霍普金森压杆试验 压缩力学性能 应变速率效应 

分 类 号：TB302[一般工业技术—材料科学与工程]