Page 234 - Mechanics Analysis Composite Materials
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Chapter 4. Mechanics of a composite layer 219
It should be noted that stiffness coefficients are symmetric with respect to the
couples of subscripts (Sijk[= Skli,) and that notation (I 2, 3) means that performing
permutation, Le., changing 1 for 2, 2 for 3, and 3 for 1, we can use Eqs. (4.172) to
write the expressions for all the stiffness coefficients entering Eq. (4.1 71). Coeffi-
cients Ai and p,,in Eqs. (4.172) are given in notations to Eqs. (4.54) and
.
A112 +2G12, A113 =Alp13 +2G13, A223 =ArPrz +~GJ
Resolving Eqs. (4.171) for strains we arrive at Eq. (2.48) with the following
coefficients of the compliance matrix in Eq. (2.49):
