固体颗粒侵蚀对低密度聚乙烯薄膜断裂强度的影响

Effect of solid particle erosion on fracture strength of low density polyethylene film

通过冲击试验研究受控条件下固体颗粒侵蚀对低密度聚乙烯(LDPE)薄膜断裂强度的影响,分析了固体颗粒冲击后LDPE薄膜的残余断裂应力和残余断裂应变随冲击角(α)、冲击速度(νp)和冲击持续时间(t)的变化规律.研究表明LDPE薄膜的断裂应力和断裂应变随冲击时间的延长而减小降解速率随冲击速度和冲击角的增大而增大.此外,在相同的粒子冲击角条件下,LDPE薄膜的断裂应力和断裂应变随冲击能呈指数下降,在相同的冲击能条件下,断裂应力和断裂应变的下降与正弦平方冲击角呈准线性增加.本研究提出了预测LDPE薄膜由于有限粒子冲击能量引起的断裂应力和断裂应变衰减的经验模型.

In this study,the infuence of solid particle erosion on the fracture strength of low density polyethylene(LDPE)film under con-trolled conditions is investigated through impact experiments.The variations in the residual fracture stress as well as the residual fracture strain of the LDPE flm after solid particle impact against the impact angle(α),impact velocity(νp)and impact duration(t)are analysed.The study revealed that the fracture stress and the fracture strain of the LDPE film decrease with an increase in the impact duration,and the degradation rate increases with the impact velocity and impact angle.Furthermore,the fracture stress and the fracture strain of LDPE film decrease exponentially against the impact energy under the same particle impact angle condition,and the reductions of fracture stress and fracture strain increase quasi-linearly with the sine-squared impact angle under the same impact energy.The study proposes empirical models to predict the attenuation of the fracture stress and the fracture strain of LDPE films due to the finite particle impact energy.