Sir @peteroznewman , sorry for my ignorance. I should have stated that. It's plane strain case. And please let me know how to assign these displacement bc's in 3d. What I used to do is to select a side surface of 3d model and constraint it by giving z=0. Is this condition applies to the surface only or on whole 3d model (in this case a simple rectangular workpiece).

@FernandoTorres The mesh must have linear elements so there is no midside node. In that case, every node is on either Z=0 or Z=1 planes. That means the entire body (or two faces) can have a Displacement BC of Z=0 leaving X and Y Free. Some nodes will need to constrain X and Y to be 0 for a Fixed Support and it will be important to capture nodes on both the Z=0 plane and the Z=1 plane for those Fixed Supports. This is simply a side face of the extrusion.

Hi Sir @peteroznewman ,paper states "the fracture strain of silicon is set as 0.01". I have created a material model for Silicon but where to put this fracture strain value in my ansys wb material model? Thanks.

In ANSYS Help, Mechancial APDL, there is the Material Reference section. In there are many material models. Some of them include Failure Criteria. You will need to do some research and find a material model suitable for brittle fracture. I can't help you more on this. Perhaps someone from ANSYS can answer this question.

how to do Strain modal analysis on ansys Workbench and how to find strain mode shape, please answer, i dont know how to do new discussion on this forum, i am new.

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## Answers

Sir @peteroznewman , sorry for my ignorance. I should have stated that. It's plane strain case. And please let me know how to assign these displacement bc's in 3d. What I used to do is to select a side surface of 3d model and constraint it by giving z=0. Is this condition applies to the surface only or on whole 3d model (in this case a simple rectangular workpiece).

Thanks.

@FernandoTorres The mesh must have linear elements so there is no midside node. In that case, every node is on either Z=0 or Z=1 planes. That means the entire body (or two faces) can have a Displacement BC of Z=0 leaving X and Y Free. Some nodes will need to constrain X and Y to be 0 for a Fixed Support and it will be important to capture nodes on both the Z=0 plane and the Z=1 plane for those Fixed Supports. This is simply a side face of the extrusion.

Hi Sir @peteroznewman ,paper states "the fracture strain of silicon is set as 0.01". I have created a material model for Silicon but where to put this fracture strain value in my ansys wb material model? Thanks.

@FernandoTorres

In ANSYS Help, Mechancial APDL, there is the Material Reference section. In there are many material models. Some of them include Failure Criteria. You will need to do some research and find a material model suitable for brittle fracture. I can't help you more on this. Perhaps someone from ANSYS can answer this question.

Sir @peteroznewman , just a friendly request. You should be among the speakers too at ANSYS LEVEL UP 😋 Let's vote for Sir Peter guys 🙂

Ha! Maybe next time @FernandoTorres

how to do Strain modal analysis on ansys Workbench and how to find strain mode shape, please answer, i dont know how to do new discussion on this forum, i am new.@vibrachid Modal questions belong in the Structures category, not the Explicit Dynamics category.

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