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[转帖] 模具英文资料

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发表于 2007-5-31 11:12:28 | 显示全部楼层 |阅读模式 来自: 中国安徽马鞍山

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模具英文资料# i) T4 |, k& O0 w. Y3 j3 q
Material properties for part design ) J1 p& G2 u  M" x" p
Plastics are sensitive to operating conditions
- ?) S- ^) w2 X' p% o  I2 }The plastics molding processes allow parts designers more freedom than working with ! A9 L3 O' e3 K9 V3 b7 J$ M0 M- y
metals because plastics materials are so versatile. Unlike metals, however, the 1 X  Z% v) B% P! O9 A3 e! C
mechanical properties of plastics are very sensitive to the type, rate, duration, and
) e% n& B# Y. afrequency of loading, the change in operating temperature, and in some cases, relative
4 f  F8 L9 B  o1 D. B: m1 M, Ahumidity. The plastics part designer must take a material's response to these conditions   U: L7 Y" }1 _3 J
into account. The table below lists the five typical loading and operating conditions, # m% k/ ?0 y' p7 q2 D( F
together with the relevant material properties a designer needs to consider. ( n  X. N  ~7 K4 b
. - H6 |' u# [  o1 t9 J" @$ i" K
TABLE 1. Typical loading/operating conditions together with the relevant
7 u4 G: r: n6 l& c6 Rmaterial properties
  w  \/ p6 t* h* |, dLoading/operating conditions. Relevant material properties.
; _& l" a" E) e* h# {/ o9 R$ y  RShort-term loading. Stress-strain behavior.
2 I* X3 Z$ ]) A  W" c% jLong-term loading. Creep and stress relaxation.
  H! Q: j4 f' d  M  O+ p; ?' a% wRepeated loading. Fatigue.
$ {" X5 J& @- RHigh velocity and impact loading. Impact strength.
! v& J; X9 k* n8 DLoading at extreme temperatures. Thermal mechanical behavior. 8 T! ]9 ]8 Y3 ?
Stress-strain behavior
! a( N# u1 R# }+ IPart strength
" E& _: g& m2 H+ l" k+ yThe stress-strain behavior of a material determines the material contribution to part strength (or ) M9 \  _2 |! H, M% Z
stiffness), the relationship between load and deflection in a plastic part. Other factors that affect part
1 S$ J& r! g8 D; v7 m* sstrength include part geometry, loading, constraint conditions on the part, and the residual stresses 8 o+ [* z: F7 i! v8 r  `& q
and orientations that result from the molding process. There are various types of strength, such as
$ |' Z& f- {) ~( E+ Utensile, compressive, torsional, flexural, and shear, depending on the load and restraint conditions
( t" `) {' {/ W6 f& Mthe part is subjected to. These types also correspond to the primary load state present in the part. The 5 q" h( Y$ c" Z. z5 b. k
stress-strain behavior of the material in the same mode as the primary load state in the part is most
" J; I) B' F5 S# xrelevant in determining part strength.
发表于 2007-6-8 00:05:50 | 显示全部楼层 来自: 中国浙江宁波
好资料...5 B( o, j% O2 B' @
收下了...
发表于 2007-6-11 16:55:42 | 显示全部楼层 来自: 中国浙江台州
就这么点,还有其它的吗,有 的话,我们可以多多交流一下.
发表于 2007-9-22 10:50:35 | 显示全部楼层 来自: 中国山西太原
多来些模具英文方面的文章,谢谢
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