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'1 Global
Mechanical Behaviour of Composites 185
axes .

t' X

CJX

I

Fig. 3.10 Single thin lamina under plane stress

In shorthand form, this matrix equation may be written as

(412 = [Tol(~lxy
where [T,] is called the Stress 'handormation matrix.
Similar transformations may be made for the strains so that
= [Tal { ;
}

{ 4;2} (3.23)
2 YXY
In each case the stresses in the global directions x, y may also be expressed
in terms of the local stresses or strains. For example,
{ 2 } = [Tu]-' { :; }

ZxY 512
where
c2 s2 -2sc
= s2 c2 2sc
[ sc -sc (2-2)