Help me with my cohesive elements simulation
Help me with my cohesive elements simulation
(OP)
Hi guys
I am currently doing my final year project, which is about simulating advanced sandwich structures. My aim now is to simulate the debonding between the facesheet and the foam. I have stayed in front of computer for 3 days and i couldn't solve my problem
I first create a single solid model and partition it with sections for facesheet and foam. After meshing, I create an orphan mesh and use the mesh edit tool to embed 2 zero-thickness cohesive layers on the interior surfaces. I assign the cohesive section based on seperation and traction response. The step module I used is static general type with time period 0.5, increment size: (0.001,5e-5,0.5). I used full integration, because I found when I used reduced integration, the artificial strain energy ALLAE is huge..
When I run my analysis, It always stops as the damage variables(SEDG) of cohesive elements reach to 1, though i have introduce the viscosity ~0.001. I want to get the full analysis as possible. I have tried number of different ways, the outcomes are still not satisfied. Any one can help me with this issue. I can send u my file if you want.
Thank you very much!!!! :)
I am currently doing my final year project, which is about simulating advanced sandwich structures. My aim now is to simulate the debonding between the facesheet and the foam. I have stayed in front of computer for 3 days and i couldn't solve my problem
I first create a single solid model and partition it with sections for facesheet and foam. After meshing, I create an orphan mesh and use the mesh edit tool to embed 2 zero-thickness cohesive layers on the interior surfaces. I assign the cohesive section based on seperation and traction response. The step module I used is static general type with time period 0.5, increment size: (0.001,5e-5,0.5). I used full integration, because I found when I used reduced integration, the artificial strain energy ALLAE is huge..
When I run my analysis, It always stops as the damage variables(SEDG) of cohesive elements reach to 1, though i have introduce the viscosity ~0.001. I want to get the full analysis as possible. I have tried number of different ways, the outcomes are still not satisfied. Any one can help me with this issue. I can send u my file if you want.
Thank you very much!!!! :)





RE: Help me with my cohesive elements simulation
RE: Help me with my cohesive elements simulation
RE: Help me with my cohesive elements simulation
**
*Material, name=CFRP
*Elastic, type=ENGINEERING CONSTANTS
130000.,9000.,9000., 0.26, 0.02, 0.02,4500.,4500.
4500.,
*Material, name=Cohesive
*Damage Initiation, criterion=QUADS
3.5, 1.3, 1.3
*Damage Evolution, type=ENERGY, mixed mode behavior=BK, power=1.
0.19, 0.57, 0.57
*Damage Stabilization
0.001
*Elastic, type=TRACTION
100000.,100000.,100000.
*Material, name=Foam
*Elastic
115., 0.3
Yes. the analysis runs but stops, it says too many attempts..
actually, i found that if the SEDG of just 1 element became 1, then the analysis stop? can you give me why this happens?
RE: Help me with my cohesive elements simulation
Excessive distortion at a total of 65 integration points in solid (continuum) elements