Abstract
In the present study, the effect of strain rate on compressive properties of the foamed polyethylene (PE) film was experimentally investigated. The foamed PE film has characteristics of thin and closed-cell structure. The impact test was carried out at the strain rate of 10^3 to 10^4s^<-1> using split Hopkinson pressure bar method. The dynamic test was carried out at the strain rate of 10^1 to 10^2s^<-1> using a drop weight testing machine with opposed load cell, which can evaluate the dynamic stress equilibrium during the deformation. Quasi-static test was carried out at strain rates of 10^<-4> to 10^<-1>s^<-1>. Within the set of experiments, the compressive stress was increased, and the densification strain was decreased with increasing the strain rate. The plateau deformation was observed immediately after the compressive testing started with no linear-elastic response phase. It was clarified that the change of strain rate sensitivity was appeared at the strain rate of 10^<-2>s^<-1>.
