Fatigue analysis

[Badri07]

Hi All,

I have been doing static structural analysis,and now i am trying to teach myself on how to do fatigue analysis.I would appreciate your comments on preliminary basics theory i need to study to make my understanding of fatigue analysis results better.

Thanks

 

[SamETABS]

hi,
according to my knowledge, Fatigue Analysis will be performed for the structural elements under FREQUNET type of vibrations, which is more probable in mechanical and aeronautical cases, like airplane wings, fuselage stress analysis or engine design.
but, in case of buildings you have to be more SPECIFIC, since it can be really broad area of disputes. However, to be able to do this type of analysis you need to develope a prerequisite knowledege of:
1-Nonlinear analysis (large displacements)
2-Plastic Analysis
3-Advanced Dynamic Analysis (NLN Time History analysis, etc..)
I recommend to check ANSYS Fatigue Module:

http://www.ansys.com/products/fatigue.asp

to get an idea about the procedure.

cheers,
Sam

 

[sharpedge]

Badri07,
Depends on which fatigue analysis you are trying to teach yourself. There's classical fatigue analysis and there's also FE fatigue analysis. As a beginer you would need a very good grounding in theorectical fatigue analysis.

I would recommend :Fatigue of Structures and Materials by Jaap Schijve-(Expensive but it is the best fatigue analysis text-book available by a mile). Once you have a very good grasp of the concept of fatigue and the different approaches to fatigue analysis..the rest is down to engineering judgement.

FE fatigue I believe you would be able to proceed with once you have a good theorectical knowledge of fatigue. There are a couple of FE fatigue codes/packages available today -nCode is quite a good. You might even want to proceed with your own codes if you'r programming skills are up to the task.

Hope this helps....

 

[LeHC]

How about the manual of FE-Safe? I think it is concise: pretty practical, with enough theory.

 

[gurmeet2003]

Fatigue analysis is not a part of FE analysis, but is a post processing of results. Software packages such as FE-safe apply post processing to the results of FE analysis.

Fatigue analysis is a very broad subject and is still a subject of research. An authoritative text would be ASM Metal Handbook on Fatigue. Books of Socie, Fatemi etc. are good. Google amazon for metal fatigue.

Read any machine design book for basics of fatigue design.

Gurmeet

 

[truckcab]

I think this page by prof. Darrel Socie is very, very good and gives you a lot of information about the subject:

http://fatiguecalculator.com/

Live Long and Prosper !