Mechanical anisotropy of lamellar structures

The force acting on the composite (i ) is equal to the sum of the forces acting on the fibre and matrix layers 

Force is equal to stress multiplied by area. Hence 

Under isostrain conditions this expression can be rewritten in terms of Young s modulus (E) as 

Substituting modulus E as the ratio of (uniform) stress to strain, we obtain 

2 Mechanical Anisotropy of Polymer Composites 9.2.1 Mechanical Anisotropy of Lamellar Structures 

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