When the lamina is reinforced with fibers in 1 (principal axis frame reference coordinate system) direction, if E1 > E2, then what is the relationship between 1Δ2 and 2Δ1?

When the lamina is reinforced with fibers in 1 (principal axis frame reference coordinate system) direction, if E1 > E2, then what is the relationship between 1Δ2 and 2Δ1? Correct Answer 1Δ2 = 2Δ1

Because of the reciprocal relations, irrespective of the values E1 and E2, 1Δ2 = 2Δ1 which is a generalization of Bettie’s law to the treatment of isotropic bodies. That is, the transverse strain is same when the stress is applied is 2-direction as when applied in 1-direction.
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