EN71,ASTM F963的拉力测试

peterxu · 发表于 2010-1-23 12:29

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请问如图所示的卡片,在90N拉开后,旁边的U字母卡片上的缺口是否还可以拉第二次呢?拉第二次就会产生小物件了,欢迎大家讨论,谢谢!!!

hewei · 发表于 2010-1-23 12:57

EN只拉一次
ASTM; 如果合适可以再做扭拉测试

peterxu · 发表于 2010-1-23 13:31

hewei,你好,请问ASTM哪个条款有提到合适的情况下可以再进行扭拉呢?合适的情况又是指哪些呢?谢谢...

hewei · 发表于 2010-1-23 15:57

请看8.81

peterxu · 发表于 2010-1-23 16:09

ASTM F963 08 Clause 8.8 最后的一段话
Projections, parts, or assemblies
that are mounted rigidly on an accessible rod or shaft designed
to rotate along with the projections, parts, or assemblies shall
be tested with the rod or shaft clamped to prevent rotation. If
a component that is attached by a screw thread that has been
assembled by the manufacturer, or that has been assembled to
the manufacturer’s instructions, becomes loosened during application
of the required torque, continue to apply the torque
until either (1) the required torque is exceeded, or (2) the part
disassembles. The test should be terminated if it becomes
obvious that the part under test will continue to rotate at less
than the required torque limit and will not disassemble.

8.8.1 8.8.1 If the part disassembles, evaluate it for compliance
with the appropriate requirements. If the disassembly exposes
an accessible component that can be grasped as noted above,
repeat the torque test on that component.

8.8.1中的the disassembly part是不是指Projections, parts, or assemblies
that are mounted rigidly on an accessible rod or shaft designed
to rotate along with the projections, parts, or assemblies shall
be tested with the rod or shaft clamped to prevent rotation.呢??
如果是的话,那这个纸牌是不是不需要拉呢??谢谢

hewei · 发表于 2010-1-23 17:16

是指

rojections, parts, or assemblies
that are mounted rigidly on an accessible rod or shaft designed
请看8.9
所有拉力应该在扭力的基础上完成,
你试想一下:既然能够做扭力,那么该部件是不是能被食指和拇指夹住,或被牙齿咬住,及
那么拉力的前提条件就是:能被食指和拇指夹住,或被牙齿咬住,以及可预见的可触

peterxu · 发表于 2010-1-23 19:04

呵呵,其实这个问题和那个小部件的问题是同根同源的,也是做EN71,如果3+以上不用做滥用测试,那就不会有小部件了,也就不需要加警告语了..................正常使用是不会产生小部件的呀....

hewei · 发表于 2010-1-23 19:08

PETER 兄:产品是做EN啊!
我还以为做ASTM

peterxu · 发表于 2010-1-23 20:39

赫赫,做是做EN,但我也想搞明白ASTM的问题呀,谢谢hewei

tassx · 发表于 2010-1-24 00:39

1。U字母卡片上的缺口不做第二次拉力：你是把整个U卡片作为一个 component 相对钥匙扣来做拉力的，这相当于（或间接于）对缺口做了拉力。
2。the disassembly part 是指 attached by a screw thread that has been assembled by the manufacturer, or that has been assembled to the manufacturer’s instructions, 即可组装和拆卸的，component 与 body 并不容为一体。
3。做EN，对3+滥用是非常有必要的：如拼缝？突出物？

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