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So is the load at step 2 in a different location or on a different vector?

Hi, IU dont know anything about Abaqus -- but you say "the loading is really complex here" as a counter argument to JOHNHORS advice to factor a linear model. But this really doesn't make any sense, its a common misconception in FEA that because the loading/geometry is complicated that you have...

I can see the point I thinkl this is a very interesting idea. Its good for games. I've sadi this before - Greg you're getting old...[bigsmile] I remember a version of Colin Mcrae Rally which was developed in conjunction with PTC who did all the FEA for realistic damage modelling, from which...

Well the problem is that as you change frequency then the modulus will vary too, and probably in a non linear way - looks like a set of physical tests to determine the paramters for a viscoelastic model might be the only way to go. Let us know the result!

Gbor is correct, non linear does not mean that the material model only has an effect over large deflections, especially with viscoelastic material models. The speed of loading or strain rate is really important here and this where a viscoelastic material model may well help. You pretty muich...

I do not know much about Cosmos any more, its been a long long time.. But I can say one thing, your figures do not quite match. You give 0.2% YS at 200KSI do you mean 0.2% proof stress? Then you have the stress strain curve with 200ksi at 0.7% stress? Most FE packages like stuff to match up so...

I have to agree with GBor analysis of welded structures can be straightforward. But only if you have full penetration welds, good weld prep and dressing after welding. Then you can do as Gbor says and make sure the stresses are lower than some reduced amount in the welded areas and HAZ. Residual...

If its not the smoothing thing I think I know the answer to this, I am just trying to work out how to explain it...

mihaiupb and RB157 I have a feeling both of you you must have not read any of crisb or my posts, because he said this "simply dividing the von Mises stress by the elastic modulus" which is exactly what rb157 said and I agreed with him...

rb157 with all due respect but your statement "there isn't anything called von mises stress, von mises defines a failure criteria" is just not true! There is a stress you can calculate called the von mises stress, which tells you the equivlent uniaxial stress, so you can then compare that...

Hmmm crisb with all due respect I dunno if I agree with you completely. Whilst it is obvious by inspection that the "von mises strain" quoted above does equal the calculated von mises stress divided by E. But there is a term that is used in FEA, fracture mechanics, and materials engineering...

matweb.com, its free and you can look for general materials or specific grades.

This is a very interesting thread, I have used vista64 on a clients machine and just found it so overhead heavy, we decided not to install it on any of our machines. But if its essentially the same as xp64 when you turn all the gadgets off then it may well be an option, especially as for new...

Semantics, I love them.

Yugabalan, no worries we can agree to disagree and the point of forum is to get different opinions. I believe that as scientists and engineers we should always use language to make accurate statements, and I wanted to ensure that what was being said had clear meaning. At least the original...

Yugabalan K, :) I seriously doubt that you have read the previous posts correctly! Just because ThomasH' word order is not so linear does not make his statment untrue. He said "not a FEM - software in the general sense". The way that reads to me is that it is not a general purpose fem software...

Ahh I will defer to johnhors on the calculix matter...

Greg you must be getting old, your memory has failed you.. ;) Indeed calculix does do beam elements, have a look at the capapbilities listed here: http://www.dhondt.de/ov_calcu.htm it shows beam elements and composite beam elements. If you do decide to go down the calculix route there is a...

You want calculix, its free and good: http://www.bconverged.com/calculix/

You really need to find an SN curve for the steel which has been tested with R= -1, as your load is fully reversed. Although analysis on the stress on the hole may prove to find a different R ratio than that of the bolt. Then on this curve find the knee where the lifetime is about 10million...