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Subject: Re: Printed Circuit Board Mechanical Properties

Date: 11/16/00 at 12:58 PM
Posted by: Miguel A. Sanz
E-mail: msanz@euita.upm.es
Message Posted:

In Reply to: Printed Circuit Board Mechanical Properties posted by David Heitkamp on 06/30/00 at 9:23 AM:

You can calculate the equivalent modulus of elasticity and Poisson`s ratio using the equations for composite materials.
Any book about this materials related how to use it, and taking into account that the fraction volume fibre,Vf, is 20% (more or less).
A good aproach for this kind of materials (epoxy-glass fibre), and in low level of charges (with linear relationship between stress-strain) are the equations obtained with the hypothesis of iso-stress and iso-strain,
finally you can obtain an equivalent modulus of elasticity and poisson´s ratio.

i.e. "An introduction to composite materials" Derek Hull and T.W. Clyne
Cambridge : Cambridge University Press, 1996

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