梯形槽聚乙烯缓冲衬垫结构的有限元优化设计  

Finite Element Optimization Design of Trapezoidal Slot Polyethylene Cushion

作　　者：李国志[1,2,3] 段毛毛 罗之遥 孙德强 LI Guo-zhi;DUAN Mao-mao;LUO Zhi-yao;SUN De-qiang(Shaanxi University of Science and Technology,Xi'an 710021,China;Key Lab of Functional Printing and Transport Packaging of China National Light Industry,Xi'an 710021,China;National Demonstration Center for Experimental Light Chemistry Engineering Education,Xi'an 710021,China)

机构地区：[1]陕西科技大学,西安710021 [2]中国轻工业功能印刷与运输包装重点实验室,西安710021 [3]轻化工程国家级实验教学示范中心,西安710021

出　　处：《包装工程》2022年第1期133-140,共8页Packaging Engineering

基　　金：国家自然科学基金(51575327);陕西省教育厅重点实验室及基地项目(16JS014);陕西省教育厅2014陕西本科高校专业综合改革试点子项目(陕教高[2014]16号)。

摘　　要：目的探究梯形槽EPE缓冲衬垫结构的动态缓冲性能,优化缓冲衬垫结构,为后续缓冲结构设计提供科学的参考方案。方法以密度为23 kg/m3的EPE材料为试验对象,对材料样品进行静态压缩试验,数据处理得出应力-应变数据,将其导入Ansys Workbench材料库中,对产品衬垫系统进行有限元冲击模拟。将冲击理论计算结果与有限元分析结果进行对比。保持等效接触面积不变,对不同底角度数和开槽排布方式的产品衬垫系统进行有限元模拟,得出最大变形量、等效应力、速度等数据。结果底角小于70°时,缓冲结构整体刚度过小,导致跌落时产品触底,不能很好地保护产品;当底角大于70°时,度数为85°的缓冲衬垫等效应力最小,为0.0966 MPa,并且产品的速度改变量最小。底角为90°时,1个槽缓冲衬垫变形量最大,为30.282 mm,等效应力为0.09681 MPa。结论在结构设计时,可将底角85°、1个槽的缓冲结构作为设计的最佳参考值,以实现缓冲材料的减量化设计和最佳的保护性能的目标。The work aims to explore the dynamic cushioning performance of trapezoidal slot EPE cushion and optimize the cushion structure,so as to provide a scientific reference scheme for subsequent design of cushion structure.With 23 kg/m3 EPE as the test material,the static compression test was carried out on the samples,and the stress-strain data were obtained by data processing and imported into the material library of Ansys Workbench,to simulate the finite element impact on the product-cushion system.The theoretical calculated results of impact were compared with the results of finite element analysis.Then,the equivalent contact area remained unchanged and the maximum deformation,equivalent stress,velocity and other data were obtained through the finite element simulation on the product-cushion system with different base angle and slotting distribution.When the base angle was less than 70°,the stiffness of cushion structures was too small,resulting in the product hitting the ground during falling,which could not protect the product well.When base angle was greater than 70°,the degree of 85°had the lowest equivalent stress of 0.0966 MPa,and the product had the smallest change in velocity.When the base angle was 90°,the deformation of one slot was the largest,and the value was 30.282 mm,and the equivalent stress was 0.09681 MPa.Therefore,in structural design,the cushion structure with a base angle of 85°and one slot can be regarded as the best reference value to achieve the reduction design of cushioning materials and the best protection effect of materials.

关 键 词：发泡聚乙烯 缓冲包装 梯形 动态缓冲性能 

分 类 号：TB485.1[一般工业技术—包装工程]