UC知道请问各位大侠，什么是stress/strain?什么是normal stress/shear stress?不胜感激！！！
来源：百度知道 编辑：UC知道 时间：2024/05/10 08:37:30
其实是具体的一段英文，但是因为本人非工程专业，实在是难以理解。原文如下，希望高手指点一二。
The strict definition of stress and strain is beyond the purpose of the present article and may be found elsewhere 14.
However, in its simplest definition, in a monodimensional structure (such as a string/spring pair), stress (or tension) may
http://erj.ersjournals.com/cgi/content/full/22/47_suppl/15S（第 3／19 页）2006-6-4 23:38:18
Physical and biological triggers of ventilator-induced lung injury and its prevention -- Gattinoni et al. 22 (47 Supplement): 15S -- European Respiratory Journal
be defined as the force per unit area which develops in a structure as a reaction to an applied external force of the same
entity but opposite direction, i.e. n= F/ S, where n is stress, F change in force and S the reference surface to which
the force is applied. This internal force, cutting the structure by an
The strict definition of stress and strain is beyond the purpose of the present article and may be found elsewhere 14.
However, in its simplest definition, in a monodimensional structure (such as a string/spring pair), stress (or tension) may
http://erj.ersjournals.com/cgi/content/full/22/47_suppl/15S（第 3／19 页）2006-6-4 23:38:18
Physical and biological triggers of ventilator-induced lung injury and its prevention -- Gattinoni et al. 22 (47 Supplement): 15S -- European Respiratory Journal
be defined as the force per unit area which develops in a structure as a reaction to an applied external force of the same
entity but opposite direction, i.e. n= F/ S, where n is stress, F change in force and S the reference surface to which
the force is applied. This internal force, cutting the structure by an
我不是学英语的，帮你把关键部分意译一下吧。
“stress（或tension）”定义为单位面积上的力大小，该力是因为外力作用在物体上，而物体要产生反作用而产生的，其大小跟外力相同，但是大小相反。stress定义为：dF/dS，实际上就跟压强差不多了。
stress可以分解为三个方向，其中一个方向跟参考面垂直，另外两个方向跟参考面平行（其实这是废话，任何的矢量都能沿x,y,z分解）
在一维情况下，strain则是物体受力后的长度改变与原来长度的比值。具体来说，如果L是物体受力后长度改变的大小，L0是原来的长度，那么strain＝L/L0