D3PLOT 22.1
Out of Plane (Z') Stress Tensor Components
Out of plane (Z') stress tensor components
Depending on their element formulation (elform on *SECTION_TSHELL) thick shells
in Ansys LS-DYNA may or may not calculate the element through-thickness (
ZZ'
)
direct stress.
-
Elform 1 (single point) and 2 (reduced 2x2 point) integration schemes are
effectively extruded thin shells and do not calculate
ZZ'
which will always be zero.
-
Elforms 3 onwards are closer to bricks than shells and develop a full 3d
stress state, so
ZZ'
is computed.
The through thickness shear terms (
YZ'
and
XZ'
)
are calculated in all cases (just like thin shells).
Thus the local stress tensor will be one of
|
For shell-like formulations |
For brick-like formulations. |
This means that principal stresses will not necessarily lie in the plane of the shell.