Shouldn't the thid strain compenent vanish in the plane strain case 1

[soildynamics]

My part is: 2D Planar, Type: Deformable with Homogeneous Solid section. Upon checking the results i found remarkable value for E33. How this can happen in the plane strain section.?

 

[xerf]

Actually, only the kinematic strain in the third direction are zero.

If you have plasticity, the constitutive algorithm will give something like EE33=-PE33 and LE33=EE33+PE33=0

Also, if you assigned a local orientation to the material different than the global system then the program will supply the results in local orientation.

 

[johnsmith2]

HI xerf,

If you mean the material is purely elastic, no plasticity, EE33 should be zero?

 

[xerf]

Yes. If the material is purely elastic then EE33=0 if 3 refers to the global 3rd direction.

 

[corus]

For generalised plane strain however the strain isn't zero but is some constant value, not necessarily zero.

corus

 

[xerf]

For the generalized plane strain section, the formulation implemented in ABAQUS assumes the material is bounded by two rigid planes in the 3rd direction.

If the two planes are parallel to each other then the strain component in the 3rd (out of model plane) direction is constant.

However, the ABAQUS formulation allows relative rotations (with respect to the reference point of the part instance) between the two planes. In this case, the current thickness of the section depends on the coordinates (x,y) and so does the strain component in the 3rd direction, which is computed as:
strain33=ln(current_thickness/initial_thickness)