Damage Boundary Curve破损边界曲线

1、Damage Boundary Curve,破损边界曲线,1135217 疏家伟 1135219 李 鹏,New Words,Phrases and Expressions,Contents,1,4,3,2,Shock fragility,Drawing damage boundary curve,Conducting a fragility test,Damage boundary theory,In the circulation process of a package, value loss caused by poor packing products, such as the de

2、formation of thin wall products, fragile products burst, the failure of the instrument, container leakage, etc. Damage is a kind of accident, which on the one hand, the inherent properties of the products (material), density, structure, on the other hand, influenced by external circulation environme

3、nt.The damage value is used to describe that for fragility.,包装件在流通过程中，由于包装不良而造成的产品价值损失，如薄壁产品的变形，易碎产品的破裂、仪器的失灵、容器泄漏等。破损是一种流通事故，它一方面受产品的固有属性(材质、密度、结构)的支配，另一方面又受外部流通环境的影响。将这种破损用量值来描述，即为脆值。,Fragility is able to withstand the maximum acceleration value products. The fragility of the size of the said prod

4、uct in the process of circulation under external load, acceleration of gravity is commonly used in multiples of G.,脆值,它是产品所能承受的最大加速度值。脆值的大小表示了产品在流通过程中承受外部载荷的能力,一般用重力加速度的倍数G来表示,Shock fragility,The characterized by the maximum tolerable acceleration level.,脆值定义为产品不发生物理的或功能的损伤所能承受的最大加速度值,Product fragil

5、ity reflects the mechanical properties of the product itself,产品的脆弱性反映了产品本身的机械性质,G-value and the damage boundary curves are two methods to determine the products fragility. However, it has limitations to reflect the impact resistance of the product with G-value, it fails to fully reflect the impact r

6、esistance of products.,G值和损坏边界曲线两种方法都可来判别产品的脆值。但G值在反映产品抗冲击性能上有其局限性，不能完全反映。,In 1968 ,Newton first introduced the concept of damage boundary packaging system design, the fragility value of used products can withstand typical acceleration pulse amplitude and the velocity change amount to indirect descr

7、iption of the product, make the damage boundary curve. 1968 年Newton 首次将损坏边界的概念引入包装系统设计, 用产品所能经受的典型加速度脉冲冲击的幅值和速度变化量来间接描述产品的脆值, 作出破损边界曲线。,Damage boundary theory,In the early 1970 s, the damage boundary theory of labs in the school of packaging, Michigan state university in the United States got the ex

8、perimental verification. Shortly thereafter, the theory won widespread recognition and application in packaging business, and in the commodity packaging design is seen as a effective method to compute the fragility.,20 世纪70 年代初期，破损边界理论在美国密歇根州立大学包装学院的实验室里得到了实验验证。此后不久，这一理论在包装企业界获得了普遍认可和应用，并且被视为确定商品包装设

9、计中脆值计算的有效方法。,Damage boundary theory,At the same time, the experiment and Materials association (American Society for Testing and Materials, ASTM) set out the ASTM D3332 mechanical impact tester are used to determine product shock fragility of standard test method for Testing standards,同时，美国实验与材料协会（A

10、merican Society for Testing and Materials，ASTM）制定出了ASTM D3332使用冲击试验机确定产品机械冲击脆值的标准试验方法的测试标准。,Damage boundary theory,Rectangular wave trapezoidal wave half sine wave sawtooth wave,矩形波梯形波半正弦波锯齿波,The influence of shock pulse shape on the damage,In the product under rectangular wave pulse impact caused t

11、he most damage,承受矩形波冲击脉冲的产品造成的危害最大。,In the product circulation environment conditions under the condition of unclear, in determining the fragility of the product, often in rectangular wave pulse as the basis of experiment and test.,在产品的流通环境条件不甚明了的情况下，在确定产品的脆值时，通常以矩形波脉冲作为试验和测试的基础。,The influence of sh

12、ock pulse shape on the damage,Damage Boundary Curve,The boundary curve based on peak acceleration as the ordinate, the abscissa denotes the velocity increment of a plane curve, the curve is damaged area and the damaged area boundary. 破损边界曲线是以加速度峰值为纵坐标，以速度增量为横坐标的一条平面曲线, 这条曲线是破损区和非破损区的分界线.,Velocity ch

13、ange, its size is equal to the acceleration pulse points of time. 速度变化量，其大小等于脉冲加速度对时间的积分.,Conducting a fragility test,To determine a damage boundary requires running two sets of tests.,Velocity test is used to determine the products Vc and acceleration test is used to determine G.,How to draw a damage boundary curve ？,Velocity Test( Figure 14.3) to determine the vertical line of the damage boundary 确定破损边界的垂直线,Step 1.,Step 2.,Accelera