The collaborative cushioning effect of foam materials and corrugated cardboard was explored in this study.The concept of regarding"EPE/corrugated cardboard"as cushioning packaging system was proposed.The stress-strain curves and energy-absorption diagrams was obtained by quasi-static compression test.The impact of temperature,EPE densities and EPE thicknesses on mechanical and energy-absorption properties of cushioning packaging system was investigated.Under the strain of 0.6,the normalized energy(W/Es)absorption of the combined buffer systems(EPE_3,EPE_5)were 0.2266 and 0.2024,respectively,which increased by 23.5%and 10.3%compared with the control group EPE(W/Es=0.1835).When the strain was 0.6,as the temperature increased from-20℃to 23℃and 40℃,the normalized energy absorbed by EPE_3 decreased significantly.The energy absorbed by EPE_3 decreased by 17.7%and 20.9%,respectively,while the energy absorbed by EPE_5 decreased by 11.8%and 19.9%,respectively.Under the above strain state,the sample combination buffer systems(EPE_3,EPE_5)with an EPE density of 24g/cm3 had the highest normalized energy absorption,which were 0.1916 and 0.1745,respectively.The coincidence degree of energy absorption curves(W/Es-ε)of composite materials(EPE_3,EPE_5)with EPE thickness of 30mm,40mm and 50mm had a high degree of coincidence.The results showed that the buffer effect of corrugated cardboard in the cushioning systems(EPE_3,EPE_5)cannot be ignored.The energy-absorption of cushioning packaging systems will decrease when the temperature increases.EPE density has an effect on the mechanical properties of the combined buffer systems and has a"threshold effect".The EPE thickness has no significant effect on the mechanical properties of the cushioning systems.The energy absorption curve(W/Es-σ/Es)will smooth when EPE thickness increase,and the optimal energy-absorption point becomes difficult to identify.
NETL
NSTL
万方数据
