文档介绍：Strain
Displacement
Strain
Strain field
Strain determination in rocks
Displacement vector and
ponents
x
y
x
z
y
z
0
v
w
u
DEFORMATION
Translation – Change in position by lateral motion
Rotation – Rigid body spin about 1 or more axes
Strain - Change in shape or distortion
1
2
3
Nature of strain
Rubber experiment (a) initial state (b) homogeneous deformation (c) inhomogeneous deformation (after Pan Lizhou,1976)
homogeneous
and
inhomogeneous
deformation
Domain of Homogeneous (H) and
Inhomogeneous (I) Strain
Bending deformation inhomogeneous deformation on the whole, homogeneous deformation in small local areas
Extension, shear strain and the strain ellipse
l0
l
Stretch s = l/l0 = (1+e)
Two definitions of shear strain for large deformation
Definition of shear strain for small deformation