尺度效应对发泡聚乙烯静态缓冲性能的影响

摘要

Closed-cell cushioning material, as expanded polyethylene, is usually shaped into cushioning structure by the processing method of cutting and adhesion. The damage to bubble by cutting would affect the cushioning properties of the material. Furthermore, the damage would affect the cushioning structure properties. A series of experiments are designed to analyze the influence of two different bubble damage ways (cutting damage type, piercing damage type) on the material cushioning properties, and contrasted with the cushioning properties curve result from classical experiment method. The results show that scale effect obviously exists in the material’s rigidity in the cutting damage type. The two kinds of bubble damage ways have influence on the cushioning properties of the expanded polyethylene. With the increase of cutting frequency, the four schemes demonstrate big differences in areas and volumes. The data of a and b schemes are similar, the data of c and d are significantly increased than other schemes.%发泡聚乙烯等闭孔式缓冲材料通常通过裁切、黏合的加工方法制作成缓冲结构，裁切对气泡的破坏会影响缓冲结构的缓冲性能。针对该问题设计了2组试验，分析了裁切破坏式和刺穿破坏式2种气泡破坏方式对材料缓冲性能的影响，并与经典试验方法得到的缓冲性能曲线进行了对比分析。研究结果表明：裁切对发泡聚乙烯的刚度存在明显的尺度效应；2种气泡破坏方式都会对发泡聚乙烯的缓冲性能产生影响；试验验证显示，随着裁切次数的增加，4种方案的衬垫厚度差别较小，衬垫面积及材料用量相差较大，a, b方案的衬垫面积及材料用量较相近，c, d方案的衬垫面积及材料用量相对于a, b方案有较明显增加。