Search found 180 matches

by kevinarden
13 Jul 2019, 12:11
Forum: ElmerSolver
Topic: Contact Mechanics - Friction Test
Replies: 16
Views: 175

Re: Contact Mechanics - Friction Test

it appears to be contacting but the cube is still falling through the base
output 1 with the Projector Max Distance = Real 1.1e-6
output1.txt
(1.76 KiB) Downloaded 2 times
output1.png
(55.58 KiB) Not downloaded yet
with it deleted
output2.txt
(1.79 KiB) Downloaded 2 times
output2.txt
(1.79 KiB) Downloaded 2 times
by kevinarden
12 Jul 2019, 18:24
Forum: ElmerSolver
Topic: Contact Mechanics - Friction Test
Replies: 16
Views: 175

Re: Contact Mechanics - Friction Test

Further investigation it still isn't contacting, although the output from ElmerSolver started reporting contact pairs found for the projector, the cube still fell through the base.
by kevinarden
12 Jul 2019, 16:43
Forum: ElmerSolver
Topic: Contact Mechanics - Friction Test
Replies: 16
Views: 175

Re: Contact Mechanics - Friction Test

I had the same result until I deleted this line, then contact started working

Projector Max Distance = Real 1.1e-6
contact.png
(96.97 KiB) Not downloaded yet
by kevinarden
12 Jul 2019, 12:15
Forum: ElmerSolver
Topic: Contact Mechanics - Friction Test
Replies: 16
Views: 175

Re: Contact Mechanics - Friction Test

repost SIF and mesh, I will see if I get the same result
by kevinarden
11 Jul 2019, 19:57
Forum: ElmerSolver
Topic: Contact Mechanics - Friction Test
Replies: 16
Views: 175

Re: Contact Mechanics - Friction Test

Your are restraining the cube in the Z direction, so the restraints are taking the gravity load and not the contact surface. In order for the contact surface to feel the weight of the cube (the normal force) then you would have to let the cube displace in the Z direction and rely on the contact surf...
by kevinarden
11 Jul 2019, 18:56
Forum: ElmerSolver
Topic: Contact Mechanics - Friction Test
Replies: 16
Views: 175

Re: Contact Mechanics - Friction Test

I checked the Elmer solution versus theory and Elmer is close using the equation for load I have. Since it is a body force the volume is automatic.
theory.PNG
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delection.PNG
(39.65 KiB) Not downloaded yet
by kevinarden
11 Jul 2019, 18:42
Forum: ElmerSolver
Topic: Contact Mechanics - Friction Test
Replies: 16
Views: 175

Re: Contact Mechanics - Friction Test

I will have to do some test cases, but the volume may be included since it is a body force.
by kevinarden
11 Jul 2019, 15:07
Forum: ElmerSolver
Topic: Contact Mechanics - Friction Test
Replies: 16
Views: 175

Re: Contact Mechanics - Friction Test

See the test case of the loaded elastic beam. the only vector sif defines the gravity vector but the body force is blank. It produces no load and no deflection. The case.sif file has a body load defined using gravity, it produces deflection. I think you are missing a normal force in your case. onlyv...
by kevinarden
11 Jul 2019, 14:52
Forum: ElmerSolver
Topic: Contact Mechanics - Friction Test
Replies: 16
Views: 175

Re: Contact Mechanics - Friction Test

Yes the normal force of the cube, the friction force is the normal force on the contact area times the coefficient of friction. I do not believe there are any automatic forces in Elmer. See the loaded elastic beam tutorial for a method to apply a gravity body force.
by kevinarden
11 Jul 2019, 12:22
Forum: ElmerSolver
Topic: Contact Mechanics - Friction Test
Replies: 16
Views: 175

Re: Contact Mechanics - Friction Test

Where is the normal force defined in your sif file?