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Need to study FEA?by koolraj09
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#1
Nov1811, 03:32 PM

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Hi all.
I am a mechanical engineering student and I know a bit of Finite element method. But I don't clearly appreciate the need for studying the course. Why is it important or rather why is it really needed? Also is there a need for mechanical engineers to know compulsorily know a modeling software? If so, why? Please help me appreciate the need for above two things. Thanks. 


#2
Nov1811, 06:58 PM

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If you don't mind trying to analyze stresses or other quantities for situations more complex than typical home work problems using hand calculations, no, you don't need to know FEA.
It's just like them oldtimers said, "Let them kids have their fancy calculators and computers. I'm keeping my trusty slide rule." 


#3
Nov1911, 09:06 AM

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Implementing FEA in the design phase allows the designer to make changes to components before committing the component to manufacture, thus it also saves money and effort. I should point out that FEA works for computational fluid dynamics as well as mechanics/dynamics of materials/solid/structures. They may be combined to look at fluidstructure interaction. 


#4
Nov1911, 09:53 AM

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Need to study FEA?
I'm not sure if your "FEA course" is teaching you how to use the FE method, or how the FE method works.
If should be fairly obvious why MEs need to know how to use FE. As #2 and #3 said, the real world of engineering isn't limited to simple problems you can solve by hand. The reason for learning how it works is maybe not quite so obvious, but if you don't understand the assumptions and limitations that are "built in" to different types of FE models and solution procedures, you can quickly get into the situation where you are not doing any sort of engineering, you are just playing with computers and producing pretty graphics, and the longterm consequence of that in the real world is usually "something bad happens". 


#5
Nov2011, 02:10 PM

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Here is a great realworld example of using FEA in the design of a bicycle.
FiniteElement Structural Analysis: A New Tool for Bicycle Frame Design 


#6
Nov2111, 08:41 AM

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As part of our developmental process at myjob, the engineers have used FEA numerous times to satisfy regulatory requirements (e.g., FDA) that cannot tested.



#7
Nov2211, 07:55 PM

P: 144

Thanks everyone. So we use FEA because the math becomes complex for real life systems such that we can't solve it by hand. Can someone suggest a good book (simple language) for FEA? I tried some but they don't have enough examples...all they have is math!!!



#8
Dec111, 10:44 AM

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I'll post what I did in another thread asking for an FEA book without the math...



#9
Dec311, 08:15 AM

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From the book cite by Mech_Engineer: Power and dynamic systems often involve nonlinear mechanics as properties change with operation or during abnormal transients. In order to effectively, or fully use FEA, one has to know the mathematics behind the modeling and simulation, as well as the physics. 


#10
Dec411, 09:58 AM

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I liked his comment on the bibliography (Appendix G, IIRC): since the 1980s the FE method has become a "mathematical wasteland" for engineers. Sad, but true. It's too easy to get the wrong idea from a mathbased introduction that "FE is simple" or that "more elements will always converge to the right answer". 


#11
Dec511, 01:19 AM

P: 144

Thank you all.
Like AlephZero said, our professor also led us to the "mathematical wasteland" that's why I'm a bit worried with my physics understanding of the subject. Once again thanks everyone. 


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