suitability of fea software

[773556]

i am designing welded steel structures for trafic security and need to find the stresses involved during impacts. we are a small company and need only to work out the effects of impact forces, is there a cost effective FEA package that you know of? does it work inconjunction with ACAD LT?

 

[thisisalonghandle]

The three FEA packages mentioned are quite capable but they have a substantial learning curve and cost lots of money.

How precise does your analysis have to be? There are a number of formulas used in shock and vibration analysis to size energy absorbing components based on impact forces. Wouldn't it be sufficient to apply a little analysis to your structure, specify a 2 to 1 or three to 1 safety factor and then use one of the formulas for package design?

 

[773556]

the analysis has to be close, within reason, i am just starting to find out my options and FEA although expensive and requiring training is of course tailoured for my research, however i think cost will be the main stumbler. when you say analysis do you know where i can find the most practical math explanations instead of the general math in text books,
thanks for all your help

 

[thisisalonghandle]

I'm sure there are documents on the web that can provide some guidance in designing structures for impact. You might want to locate one of the government MIL-STD specifications on that topic. They usually explain the theory behind what the standard is designed for.

As for reference texts try the "Shock And Vibration Handbook". I don't remember who the author is. It covers a wide range of topics and I'm sure there is something about designing for impact.

Hope this helps.