APDL: SHELL181 stress decomposition- SMISC 34 to 47
APDL: SHELL181 stress decomposition- SMISC 34 to 47
(OP)
Hello everyone,
For SHELL181 element, SMISC quantities from number 34 to 47 are;
Sm: 11, 22, 12 Membrane stresses
Sb: 11, 22, 12 Bending stresses
Sp: 11, 22, 12 Peak stresses
St: 13, 23 Averaged transverse shear stresses
There is an option of stress linearization in Path operations which returns membrane, membrane+bending and total stresses. Are the above listed SMISC quantities doing the same thing as the stress linearization option under 'Path operations'?
Where can I find more information on how these quantities are being calculated by Ansys? I searched the manual but could not find information about the background theory for these SMISC quantities.
The purpose of my analysis is to study whether the dome structure is in a very good membrane state (negligible bending) or significant bending state. I think this can be done using Sm and Sb.
_________________
Best regards,
Sushant Goel
MSc Uni Stuttgart
For SHELL181 element, SMISC quantities from number 34 to 47 are;
Sm: 11, 22, 12 Membrane stresses
Sb: 11, 22, 12 Bending stresses
Sp: 11, 22, 12 Peak stresses
St: 13, 23 Averaged transverse shear stresses
There is an option of stress linearization in Path operations which returns membrane, membrane+bending and total stresses. Are the above listed SMISC quantities doing the same thing as the stress linearization option under 'Path operations'?
Where can I find more information on how these quantities are being calculated by Ansys? I searched the manual but could not find information about the background theory for these SMISC quantities.
The purpose of my analysis is to study whether the dome structure is in a very good membrane state (negligible bending) or significant bending state. I think this can be done using Sm and Sb.
_________________
Best regards,
Sushant Goel
MSc Uni Stuttgart





RE: APDL: SHELL181 stress decomposition- SMISC 34 to 47
Rick Fischer
Principal Engineer
Argonne National Laboratory
RE: APDL: SHELL181 stress decomposition- SMISC 34 to 47
Best regards,
Sushant Goel
MSc Uni Stuttgart
RE: APDL: SHELL181 stress decomposition- SMISC 34 to 47
Rick Fischer
Principal Engineer
Argonne National Laboratory
RE: APDL: SHELL181 stress decomposition- SMISC 34 to 47
I found the relevant formulas in section '2.3.3. Shell Element Output'. Also, I made a small plate model in APDL with the longitudinal direction of plate aligned to x-axes. From contour plot> element solution> stress > sx, I got the top (-0.292) and bottom (0.142) surfaces total stress.
Then, I used the element table options to get N11 stress (-0.074) and SB11 stress (-0.217).
-0.074 + (-0.217) = -0.291
-0.074 - (-0.217) = +0.143
Best,
Sushant Goel
MSc Uni Stuttgart