I am trying to model a 3D End Notched Flexure test using ABAQUS. The end notched flexure specimen consists of two beams with a cohesive element interface and a pre-crack. The test uses a three point bend configuration. The specimen is modeled using solid elements (C3D8) for the ENF arms and the interface is modelled using finite thickness cohesive elements (COH3D8). A pinned and a roller boundary condition is applied to the ends of the specimen and a displacement is applied centrally.
The analysis fails within the first few increments. The error message either reads that the force residuals haven't converged or the cohesive elements show excessive distortion. I have tried using both, Static general step and a Dynamic implicit step with quasi static definition. Refining the mesh and reducing the increment size has not helped. Using cohesive contact instead of cohesive elements did not help either.
Can someone comment on ways to resolve these errors? Attached the .inp file for my analysis.
Thanks in Advance
Hello, check the link https://www.youtube.com/watch?v=Lj0SwipIMLk. Hope it is of assistance
Hi Sai Aranke,
When you have damage initiation and progressive damage in your analysis, whether there is "cohesive" in your analysis or not, you should use the Explicit solver to avoid convergence issues. Refer to this link: https://caeassistant.com/blog/abaqus-standard-or-abaqus-explicit/
Moreover, I suggest using cohesive contact instead of the cohesive element.
Also, check the link below. You will find useful tips and tricks about cohesive analysis.
https://caeassistant.com/product/implementation-of-cohesive-by-interaction-element-base-methods-in-abaqus/
Best wishes.
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