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Hi,

I am new in ABAQUS. I tried a lot to find the critical lateral torsional buckling moments from ABAQUS for simply supported Steel I beams. I modelled an I beam with shell element and define the sections. I meshed it by number. Then I did buckle analysis with 4 eigen values in step part. I create boundry condition as a simply supported beam using those node of after meshing and I also applied uniform moment at two end.

But, how do i find the critical moment for LTB? Again, is there any procedure to follow? 

Thanks in advance.

Dear all,

Why we have an oscillating behaviour when calculating stress in FEM?

I saw the sentences in the paper:

'Another reason is that stresses are less accurately predicted than strains in FE simulations. Calculated stresses do also show a tendency for an oscillating behaviour, especially in dynamic explicit simulations.'

'stress is less accurate predicated than strain' is easier to understand, but I was wondering the existence of oscillating behaviour for calculating stress.

Any comments are welcome.

I am trying to model (3D) dressing process in which both the dressor and the grinding wheel are rotating as deformable bodies using ABAQUS 6.13 (Explicit analysis). I want to simulate a small portion from both wheels rotating against each other with general contact. To rotate them I am applying coupling constraint. However, when I apply coupling constraint to rotate the wheels with their respective reference points (RP's), they become rigid in sense that no stresses are developed. Even if I apply only VR3 to RP's, no stresses will develop in the grinding wheel or dressor.