标题: EN71,ASTM F963的拉力测试 [打印本页] 作者: peterxu 时间: 2010-1-23 12:29 标题: EN71,ASTM F963的拉力测试 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!!!作者: hewei 时间: 2010-1-23 12:57
EN只拉一次 * H7 L' z- J- J C$ q0 EASTM; 如果合适可以再做扭拉测试作者: peterxu 时间: 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...作者: hewei 时间: 2010-1-23 15:57
请看8.81作者: peterxu 时间: 2010-1-23 16:09
ASTM F963 08 Clause 8.8 最后的一段话 $ k) B0 C' E% f) _+ OProjections, parts, or assemblies . U# n' k2 u$ X% mthat are mounted rigidly on an accessible rod or shaft designed" R" K0 o; f9 v5 ]; n
to rotate along with the projections, parts, or assemblies shall% O3 Q* }+ ?8 z$ b5 @2 Y1 D
be tested with the rod or shaft clamped to prevent rotation. If, c$ i$ b/ E, N' [/ ~0 v2 B- H, y
a component that is attached by a screw thread that has been. v3 y9 F3 U5 G4 X% R
assembled by the manufacturer, or that has been assembled to+ I" `% \* E, A9 H4 J& X
the manufacturer’s instructions, becomes loosened during application 3 J4 @$ p7 D1 T' [' w: rof the required torque, continue to apply the torque 5 S4 @/ p$ D# g7 e1 s. ]* xuntil either (1) the required torque is exceeded, or (2) the part % d5 {! `8 x" \; cdisassembles. The test should be terminated if it becomes . x' _. ~# n! X1 ~7 Vobvious that the part under test will continue to rotate at less$ E# k5 ^' t* [4 ?. X/ p2 C! n
than the required torque limit and will not disassemble. % H- Y% D9 S- O9 P ) E4 J. d- G9 J0 @ K6 j3 c) T8.8.1 8.8.1 If the part disassembles, evaluate it for compliance - V) u7 x9 S% c7 [- _! G0 Nwith the appropriate requirements. If the disassembly exposes ; A8 O" d. @0 V7 l7 yan accessible component that can be grasped as noted above,7 d3 d) ]) H" `& A+ ^0 q
repeat the torque test on that component. ; j# f% R6 A3 i9 L$ B+ f ! t" c) f& W1 v4 y# |1 y8.8.1中的the disassembly part是不是指Projections, parts, or assemblies ! \. L a% l, f, i8 i' xthat are mounted rigidly on an accessible rod or shaft designed / R% y, o5 z" D0 \to rotate along with the projections, parts, or assemblies shall ! w, q4 A) t6 O& j6 o* Sbe tested with the rod or shaft clamped to prevent rotation.呢??4 F+ D) v$ `8 x6 O
如果是的话,那这个纸牌是不是不需要拉呢??谢谢作者: hewei 时间: 2010-1-23 17:16
是指rojections, parts, or assemblies " K& K* o0 {! T4 Zthat are mounted rigidly on an accessible rod or shaft designed4 f1 p3 [% @: M2 C/ J7 T' \# B
请看8.98 Z8 X& @5 I; M' d: _9 E
所有拉力应该在扭力的基础上完成, % F4 v0 w5 \( X/ p n- Q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% Z8 m O' H9 c1 P7 F: U& R# u$ W$ K
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,以及可预见的可触作者: peterxu 时间: 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....作者: hewei 时间: 2010-1-23 19:08
PETER 兄:产品是做EN啊! 8 g( `) h& N' m6 k; k- |我还以为做ASTM作者: peterxu 时间: 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 作者: tassx 时间: 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。) e5 q$ i4 ]/ D- K& _
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。 6 z6 m" l; K9 k3。做EN，对3+滥用是非常有必要的：如拼缝？突出物？
rojections, parts, or assemblies