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complex young's modulus?

complex young's modulus?

complex young's modulus?

(OP)
when considering structural loss in vibration problems, young's modulus E is a complex,E=E1(1+i*sigma).I want to know the value of sigma for aluminium.who can help me? Thanks!

RE: complex young's modulus?

You'll get about 0.2% damping in a welded aluminium structure. How you turn that into your E* parameter is left  as an exercise.

Cheers

Greg Locock

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RE: complex young's modulus?

(OP)
thank you for your reply, Greg Locock.From some information i got recently,i know the sigma for steel is about 0.03.So i use 0.03 for aluminium in my computation.Can you tell me where(books or websites) i can find the value for aluminium.Thanks!

RE: complex young's modulus?

The internal loss factor for the material is not usually the dominant form of damping in a real structure. I seem to remember than Beranek quotes 1E-2 to 1E-3 for aluminium. That's a pretty broad range though.

M

--
Dr Michael F Platten

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