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Abaqus/CAE Explanation of values

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semipro

Mechanical
Joined
Dec 2, 2008
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Location
GB
Hi I have just recently begun using Abaqus CAE in detail and was wondering if someone could help me with a problem that I cant seem to fully understand.

The analysis that I have set up is a plate with a hole and the plate is in tension. Only a quarter of the plate is modelled and nodal points have been placed along the sides.

The problem that I have is that I cant fully understand why Abaqus doesn’t understand that the stress at the edge of a free space should be zero i.e. In this problem the nodes next to the hole and edge of the plate.

The model has been set up with CPS4
Also is there any simpler way to improve the analysis that I have done.

Thank you for any replies in advance.
 
Your are more likely to get answers to this if you post it in the ABAQUS forum.
 
semipro,

It sounds like there could be an error in your boundary conditions. Try the analysis of 1/2 of the plate and compare results. I would cut the model at the hole centerline (perpendicular to the applied load) and fix all the nodes at this "cut".

tg
 
"stress at the edge of a free space should be zero "

Um, no. The normal stress at the edges should be zero. Also, since the stresses are actually computed at the center of the elements, the edge stresses are extrapolated and small errors can creep in...

But, if you are talking about normal edge stresses of the same rough order of magnitude as the applied tensile stress, then the boundary conditions are not properly applied. Review the deflections and see what is going on...
 
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