材料力学(英文版)Chap1

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材料力学(英文版)Chap1

Construction of a Stress Element for Plane Stress:All stress components on a plane are zero

3-dimensional element

y

2-dimensional element

y

σyyC

τyx

τxydx

σxxτyx0

τxyσyy0

000

xx

yy

CB

yx

xy

dy

AD

dz

xx

x

σxx

Bdyτxy

yx

σyy

σxxdx

yy

Symmetric Shear Stresses: τxy=τyxτyz=τzyτzx=τxz A pair of symmetric shear stress points towards the corner or away from the corner.Stress cube showing all positive stress components

σxxτyxτzx

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τxyσyyτzy

τxzτyzσzz