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KristofferC / Phon

Insert cohesive elements between grains in microstructures
MIT License
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Query about zero thickness cohesive element #7

Closed mrzhaojyi closed 9 years ago

mrzhaojyi commented 9 years ago

Hi, Mr.KristofferC

       I am testing the cohesive element in abaqus. However I really don't know how to using the 2-D zero thickness cohesive element in CPFEM. Each time I run the abaqus job, there is a error: "The geometry of 69 elements is too distorted" no matter how small my load. And I checked the message file, it says :

***ERROR: ELEMENT 670 INSTANCE TESS-1 IS HIGHLY DISTORTED

***WARNING: THE LENGTH OF ELEMENT 670 INSTANCE TESS-1 IS EQUAL TO OR SMALLER THAN ZERO Could you give me some advice about how to deal with this problem? I think it should be ok to use zero thickness in the inp file modelling but I really can't figure this problem.

Best regards Jingyi

KristofferC commented 9 years ago

Hmm, that's strange. Can you post the .inp file you send into Phon (unless it is huge) and I will try see what is wrong.

mrzhaojyi commented 9 years ago

This is a input file to test the 2D boundary. The bottom is fixed and a small disp is applied on the top. For simplify, I just use homogeneous material install of using a UMAT.

On Mon, Feb 2, 2015 at 6:40 PM, Kristoffer Carlsson < notifications@github.com> wrote:

Hmm, that's strange. Can you post the .inp file you send into Phon (unless it is huge) and I will try see what is wrong.

— Reply to this email directly or view it on GitHub https://github.com/KristofferC/Phon/issues/7#issuecomment-72562858.

mrzhaojyi commented 9 years ago

I finally found the reason : The material properties for grain boundary is not correct. And the 0-thickness cohesive element must be treated carefully.

KristofferC commented 9 years ago

Sorry for being unhelpful. I have been very busy lately with a course and other things. Glad you got it to work :+1: