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I am trying to model a simple compression test (50% reduction in height) using Abaqus.

So for this, I have a lower die, Specimen and an upper die.

The dies are modeled as deformable, and I've also added reference points to both the dies so that I can add a rigid body constraint to both of the dies.

For the boundary condition, I've fixed the top die and for the lower die I've applied a velocity of 10. 

I'm unable to get a 50% reduction in height. Can someone please help me with this?

I am using cohesive elements coupled with USDFLD subroutine. I have a damage variable in my subroutine, which according to the calculations is updating in a correct way. But my problem is that SDEG is not updating, hence the elements are not being deleted. I have called the STATUS variable and that is also not updating. Can anybody provide some help?

Hello everyone,

In mixed-mode CZM in Abaqus, it seems that the fracture load in not sensitive to mode II fracture energy as the cohesive elements undergo mostly opening deformation. However, when I model elastic properties for the material, it undergoes both opening and shear displacements. It means CZM elments don't model the deformation properly. Even change in relative stiffness couldn't solve the issue. Has anybody faced this problem? If CZM elements cannot represent the deformation well, what have people done in the literature to find the failure load for mixed-mode loading?

Dear all,

I have a dummy question, but it seems there is no universally accepted answer. For a general structure subject to a cyclic loading with constant ampitude, we use FEA program to run stress analysis under peak and valley load point respectively. Now, we need to post process the FEA result to come up with the stress range that will be plugged into S-N curve to come up with a "N" value.

Dear Mechanicians,

     I am wondering with the size eff€ect in solids with quasibrittle materials.  What is the basic behind Size effect in structural materials. Thanks for your comments.

!!!Hii every body!!! Wish you all a very good day!

I am searching for opinions how to copy particular results from one text files to anothers. (You may assume I have a text files , unformatted, like a paragraph, and then starts 3 rows and 2 columns numeric values. I have to delete all the characters/strings, just want those 3rows and 2 cols; or copy those 3rows and 2 cols, anyway... I want to extract those via Matlab). I know it may be stupid question nut I am confused :p :-)

Thanks in adv...