摘要
多年的运输包装实践说明,根据传统破损边界曲线(DBC)得到的产品脆值应用到缓冲包装设计时,常会产生保守性,导致过度包装及包装材料的浪费等。根据瞬态振动理论中冲击响应谱(SRS)的基本特性,采用Biot模型代表一个产品的结构系统模型,则该结构系统是由一系列单自由度(SDOF)质量-弹簧振子所组成,再获得其SRS。通过现代的实验装置及先进测头可以获得结构系统中易损元件的SRS。然后根据工程力学中动荷系数的概念,在上述易损元件SRS基础上,设定易损元件危险点处最大应力达到弹性极限时,SRS表示的最大响应加速度值即达到了临界值,在此基础上绘制新的DBC,据此可求得基于响应加速度的新脆值。此新脆值使用在缓冲包装设计时,将会避免上述传统脆值可能带来的保守性。
Distribution packaging practices demonstrate over-package or material wastes due to the conservatism in fragility according to traditional damage boundary curve（DBC） applied in cushioning packaging design. Based on the basic features of shock response spectrum（SRS） in vibration theory, the model of Maurice Biot（Biot Model） is put forward and used as a structural model by taking the product structure as a vibration system consisting of a number of single degree of freedom（SDOF） mass-spring oscillators. Through testing and measuring by use of advanced electronic equipments with automatic signal analysis devices, the SRS of elected fragile elements in the structural system can be obtained. Then from the concept of dynamic coefficient（G factor） in engineering mechanics, the G factor is just nearly equal to the fragility Gs of the element when the maximum stress in the element dangerous point reaches the elastic limit of the element material. That means each Gs in the new DBC based on responses can be drawn graphically indicating the relationship between critical maximum response accelerations and natural frequencies of the key parts in products system. According to the new DBC, the new fragility based on response acceleration of a key part in product system can be acquired if the natural frequency of the key part is known. This new fragility is certainly more suitable to cushioning packaging designs because the conserva- tism factor in traditional fragility is eliminated,
出处
《包装学报》
2013年第3期46-50,共5页
Packaging Journal
关键词
缓冲设计
运输包装
破损边界曲线
cushioning design
transportation packaging
damage boundary curve（DBC）
