01-25-2024, 09:26 PM
I've made a simpler example and solved with Mystran. It's a single CHEXA element supported on one face (grids 1,2,3,4) by SPCs and with a moment about Z applied to the opposite face (grids 5,6,7,8) via RBE3 from a separate grid 9.
Input file:
Here's the solution for reaction forces on the SPC nodes (T1-T3) and my hand calculated moments about the 3 axes due to those forces (Moment X, Moment Y, Moment Z):
The total reaction moment about Z (-1.000000E+05) is the opposite of the applied moment which looks correct. However, there's also a reaction moment about Y (-1.000000E+04) which I think should be zero. It doesn't balance with the applied moment.
Any thoughts?
Input file:
Code:
SOL STATICS
CEND
SPC = 1
LOAD = 1
SPCFORCES = ALL
BEGIN BULK
GRID 1 0 0. -1. 0.0
GRID 2 0 1. 0. 0.0
GRID 3 0 0. 1. 0.0
GRID 4 0 -1. 0. 0.0
GRID 5 0 0. -1. 1.2
GRID 6 0 1. 0. 1.0
GRID 7 0 0. 1. 0.8
GRID 8 0 -1. 0. 1.0
GRID 9 0 0. 0. 1.0
C Element Connectivity: CHEXA
CHEXA 1 1 1 2 3 4 5 6 +CH1
+CH1 7 8
PSOLID 1 1 0 2 FULL
MAT1 1 200.E9 0.
SPC 1 1 1 0.
SPC 1 1 2 0.
SPC 1 1 3 0.
SPC 1 2 1 0.
SPC 1 2 2 0.
SPC 1 2 3 0.
SPC 1 3 1 0.
SPC 1 3 2 0.
SPC 1 3 3 0.
SPC 1 4 1 0.
SPC 1 4 2 0.
SPC 1 4 3 0.
MOMENT 1 9 0 100000. 0. 0. 1.
RBE3 2 9 123456 1.0 123 5 6 +1
+1 7 8
ENDDATA
Here's the solution for reaction forces on the SPC nodes (T1-T3) and my hand calculated moments about the 3 axes due to those forces (Moment X, Moment Y, Moment Z):
Code:
GRID COORD T1 T2 T3 Moment X Moment Y Moment Z
SYS
1 0 -2.431020E+04 9.081890E+02 5.563799E+02 -5.563799E+02 -2.431020E+04
2 0 5.401138E+02 -2.440502E+04 4.443620E+03 0.0 -4.443620E+03 -2.440502E+04
3 0 2.581279E+04 -1.975163E+03 5.563799E+02 5.563799E+02 -2.581279E+04
4 0 -2.042702E+03 2.547199E+04 -5.556380E+03 0.0 -5.556380E+03 -2.547199E+04
Sum 0.0 -1.000000E+04 -1.000000E+05
The total reaction moment about Z (-1.000000E+05) is the opposite of the applied moment which looks correct. However, there's also a reaction moment about Y (-1.000000E+04) which I think should be zero. It doesn't balance with the applied moment.
Any thoughts?