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Why an unconstrained part subject to a displacement BC has no-zero stresses and gets deformed?

Why an unconstrained part subject to a displacement BC has no-zero stresses and gets deformed?

Why an unconstrained part subject to a displacement BC has no-zero stresses and gets deformed?

(OP)
Hi all,

I am performing an impact analysis with Abaqus explicit. I am re-doing the model, since the final result of what I modeled before had some issues I was not able to solve. Therefore, I am now going ahead step by step checking the result after each addition to the model.

I just created three parts of the model, two eyelets and a central component, as in the picture. I have applied a displacement BC on the top of the central component and there are no encastres applied. Therefore, I would expect the parts to translate without any stress generated in the material. Instead, as you see in the picture, there are non-negligible stresses and the part is even slightly deformed!

Important things are the followings. Tie constraints between the two eyelets and the central component are defined. Element type is C3D8R. Step is defined as "dynamic, explicit" with NIgeom ON, timestep is 0.001. Material is defined adding "density" and "elastic behaviour". There are no errors or warning for the mesh check. The amplitude is defined as tabular.

If you have any clue why I end up with this behaviour, I would really appreciate your help. I am quite confident that the unrealistic result I had in the complete model I created before is directly linked with this basic issue.

Thanks.

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