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Re: Mechanica..Elasto-plastic

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For those following this thread I am finally getting around to summarizing what I found. I have discovered certain limitations using LDA, specifically the plasticity combined with contact, but I mangaged to get around them for now. Although plasticity with contact is indeed possible, I was attempting to simulate a preloaded bolt in a hole with contact under the bolt head using anisotropic materials for a directional temperature cooling load as a way to apply preload. What I didn't know at the time was that anistropy is not yet available in LDA. Let me explain.

 

PRELOAD analysis is not available with LDA (plasticity + contact) so I am unable to use the preload analysis option to load the pin (bolt). So I attempted the use of a cooling temperature load. To avoid the pin shrinking in all three directions and only have the axial direction shrink, I attempted using orthotropic CTEs. However, I am unable to use orthotropic material properties with this LDA so for now I am using isotropic CTEs and ignoring the fact that the pin will contract in all directions; not what I had hoped for, but it works.

 

Finally, I wanted to separate the preload (temperature load) from my applied mechanical load. Unfortunately I am unable to run the mechanical load and the temperature load as separate load conditions in the same analysis for this LDA. To see their separate effects, I must run two separate LDA analyses. Since I cannot combine the results of two different analyses, I would need to run a third and final analysis with the loads combined in the same load set. In summary, I must have isotropic materials, no preloads, and place all desired loads in a single load set.

 

I believe I am getting along OK now and appreciate Christos Katsis' help.

 

One other thing I found in attempting to see animated results (stresses, etc.) is that animations for the final set of results in the LDA did not appear to be possible. To see results animations, I must solve for multiple load steps and request results for each load step.

 

Randy Speed


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