EPS泡沫冲击压缩和吸能特性试验研究

Experimental Study on Impact Compression and Energy-Absorbing Property of Expanded Polystyrene Foam

采用小直径霍普金森压杆(SHPB),对3种密度的聚苯乙烯(expanded polystyrene,EPS)泡沫进行冲击测试,得到了5种应变率下的应力-应变全曲线.为了比较EPS泡沫在冲击荷载和准静态加载下的不同响应,对EPS泡沫试样进行3种应变率下的准静态单轴压缩试验.探讨了泡沫密度、加载应变率对EPS泡沫应力-应变行为、能量吸收性能和破坏特征的影响,应用能量吸收能力、吸能效率曲线和能量吸收图评价了其在冲击荷载下的能量吸收性能.结果表明:泡沫初始密度和加载应变率对EPS泡沫的吸能与冲压特性具有较大影响.

Impact tests on expanded polystyrene（EPS） foams of three different densities are performed by means of small-diameter split Hopkinson pressure bar（SHPB）. The stress-strain curves under five differ- ent strain rates are obtained. Quasi-static uniaxial compression tests under three different strain rates are also conducted to make a comparison between EPS foam＇s dynamic and quasi-static compression behavior. The effects of foam density and strain rate on EPS foam＇s stress-strain curve, energy absorption property and fragmentation characterization are analyzed. By using energy absorption capacity method, energy effi ciency method and energy absorption diagram, energy absorption and dissipation property of EPS foam under impact loading are evaluated. The results show that the initial foam density and loading strain rate exert significant influence on the energy absorption and impact compression properties of EPS foam.