Ive modeled a composite sandwitch with ANSYS with a pressure. The element chosen was SHELL181.
I want to know the Stresses in the x, y and xy directions, the displacements and the deformations only in a few points so as to compare with the Navier and Rayleigh-Ritz solutions made following Reddys book.
1.-The first problem is that I dont know how to ask ANSYS to list the displacements and deformations.
2.-The second one is that I know how to ask ANSYS to list all the elements in a layer,
but I dont know how to ask only for the element in the center of the layer and the four corners (in fact I have no idea of how many nodes I need to compare)
3.-The last one is about verifying the stress in the plies by the Tsai-Hill criterion. I must do that but Ive only found the Tsai-Wu criterion in the ANSYS help. Ive tried to apply it, but when I go (in the workbench) to General Postproc->Failure Criteria->Criteria Check, ANSYS says: The input failure criteria for 2 materials generated errors, warnings, and/or notes
Thank you in advance,
The code developed:
[code]/TITLE, MCL PROJECTII
ET,1,SHELL181 ! 4 NODE LAYERED SHELL
OUTRES,ALL,ALL ! ALL SOLUTION ITEMS
KEYOPT,1,3,2 ! FULL INTEGRATION
KEYOPT,1,8,2 ! WRITE LAYER RESULTS
SECDATA,1.83E-3,2,90 ! LAYER 1: 1.83E-3 THK, THETA 90
! ORTHOTROPIC MATERIAL PROPERTIES FOR BOTH MATERIALS
MP,EZ,1,10e9 ! EZ ASSUMED LOWER
MP,GXZ,1,12e9 ! ASSUMPTION GYZ=GXZ
MP,EZ,2,5e9 ! EZ ASSUMED LOWER
MP,GXZ,2,6.4e9 ! ASSUMPTION GYZ=GXZ
! SPECIFY GEOMETRY PARAMETERS
ndiv=30 !NUMBER OF DIVISIONS
ht=0.022 !TOTAL THICKNESS
! CORNER KEYPOINTS OF QUADRANT (AREA)
ESIZE,,ndiv ! 30X30 MESH USING QUARTER SYMMETRY (ndiv)
! APPLY B.C.
NSEL,S,LOC,X,a/2 ! SELECT NODES
!SURFACE LOAD GRADIENT
FC,1,S,XTEN,0.82e9 !Mat1, Stresses, allowable tensile stress in the x direction
FC,1,S,ZTEN,1e15 !If you do not want the failure stress to be checked in a particular direction, specify a large number in that direction
LAYPLOT,1,1,12 !Element 1, from layer 1 to layer 12 (all of them)