problem with modeling plate bending using Ansys
problem with modeling plate bending using Ansys
(OP)
I having been having trouble modeling plate bending using Ansys 8.0. I am trying to simmulate what happens to a plate when it is bent in a brake press. I have made a 2D model of a simply supported 3 foot long 2 inch thick plate. The plate is to undergo multiple bends to obtain a 6 inch bend radius. The problem that I am having is that the supports are ten inches apart and the plate will not deflect more than 1/2 inch per bend (if I try to get more than that ansys says the plate is unconstrained and ridged body motion has occured). This 1/2 inch is not enough for me to get a 6 inch bend radius.
The elements that I am trying to use are Plane 82 with the plane stress with thickness option on (the plate is modeled as 6 inches thick). The element size that I am using is 0.2 inch squares.
Does anybody have any idea how to get a larger deflection so that I can obtain a 6 inch bend radius?
The elements that I am trying to use are Plane 82 with the plane stress with thickness option on (the plate is modeled as 6 inches thick). The element size that I am using is 0.2 inch squares.
Does anybody have any idea how to get a larger deflection so that I can obtain a 6 inch bend radius?





RE: problem with modeling plate bending using Ansys
Furthermore, what are you using as your plasticity model? Have you set nlgeom to on?
RE: problem with modeling plate bending using Ansys
I have tried using the Shell93 elements but it seems to take up alot of disk space. The files get extremely large for just one load step (100MB). Is this normal and if not how do I correct it?
RE: problem with modeling plate bending using Ansys
On a separate note, I wouldn't consider 100MB to be a large amount of disk space. I regularly (every two to three weeks) fill up a 20GB partition on my HD and need to archive to DVD.
RE: problem with modeling plate bending using Ansys
RE: problem with modeling plate bending using Ansys
RE: problem with modeling plate bending using Ansys
It would also help if you posted your non-linear material properties, because there may be problems there as well.
RE: problem with modeling plate bending using Ansys
In ansys to define the supports I go to define loads-apply-structural-displacement-on nodes.
My material properties that I am using are for A36 steel that is at 1100F. It is put in ansys using the mises plasticity multilinear option the values are:
The linear isotropic properties are: EX = 30800
PRXY = 0.288
Multilinear Isotropic Properties are:
Strain Stress
0.000415 10
0.002 15
0.005 18
0.01 20
0.02 23
0.03 24
0.04 25
0.05 25.2
0.06 25.4
0.07 25.6
0.08 25.8
RE: problem with modeling plate bending using Ansys
Good luck!
RE: problem with modeling plate bending using Ansys
Regards
Dave
RE: problem with modeling plate bending using Ansys
Where does it say the limits of ANSYS 8.0?
thankyou for your help.
RE: problem with modeling plate bending using Ansys
hask: as far as limitations go - check out the help regarding the specific element type.
RE: problem with modeling plate bending using Ansys
One problem I have in increasing the number of elements is that the file size and run time increase and were I work I am limited on the amount of disk space and run time. Is there anyway that I can increase the speed of the processor without hurting my results.