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Modal Analysis of a Layered Composite Material to Find Loss Factor/Modes

07/31/2009 2:10 PM

I have to do Modal analysis to find the loss factor , natural frequency, damping characteristics of any layered composite beam in ansys.suggest me please which model is to be used and how modelling can be done in ansys.

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#1

Re: Modal Analysis of a Layered Composite Material to Find Loss Factor/Modes

07/31/2009 7:49 PM

It's been some years since I dealt with ansys, but... A good initial approximation would be to consider the material anysotropic with properties oriented accordingly and with properties values balanced according your composite composition. This is the simpler and easiest way of doing, with the advantage of being able to use any element type you want. Note that modeling and element should be chosen based on your problem geometry, not based on your physical material type, ok? It's a model, not the real life. The fun in FEA is to approximate both...

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#2
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Re: Modal Analysis of a Layered Composite Material to Find Loss Factor/Modes

08/03/2009 4:36 AM

Thank you sir for replying me. Sir please can you send one tutorial on the modal analysis of layered composite material for finding nodes. please help me in this regard.

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#3
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Re: Modal Analysis of a Layered Composite Material to Find Loss Factor/Modes

08/03/2009 7:34 PM

Is it Ansys? Follow the software help! This is by far the most usefull resource I have found about it, has all the information you need about the available element types and what you can expect from them, and also applicability. In your case, it's just a matter of choosing the right element according the modeling geometry, and setting the material properties accordingly, be sure to align it correctly with the coordinate system. The rest is with the software engine. You may need some tries varying element size and checking all constraints and node coupling between parts, but be brave! Courage! You can. If you think it's too hard, start with an isotropic solid to be sure your geometry is correct and the mesh is good. Avoid big aspect ratios in elements, as they are a big error propagation source - remember directors cosines theory? After all is working, vary material (or maybe element type) and check if it does make sense. In FEA, always watch out for units used, and do check calculation by a simplified manually calculated model. As long as its essentially numeric, if you input junk, you will receive junk calculated. And you may be find yourself explaining why it shows a beam that deflects upward when you put some load in... Just good practices.

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#4
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Re: Modal Analysis of a Layered Composite Material to Find Loss Factor/Modes

06/26/2011 1:58 PM

HI sir please tell me how to find loss factor in ansys workbench using modal or harmonic analysis,and also tell me how to do spectrum analysis in ansys workbench

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