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In the case of unidirectional fiber reinforced composites with fibers oriented in the 1-direction, how cannot υ23 be related to υ12 and υ21?

In the case of unidirectional fiber reinforced composites with fibers oriented in the 1-direction, how cannot υ23 be related to υ12 and υ21? Correct Answer υ12 = υ21

Christensen, a researcher, has shown that in the case of unidirectional fiber – reinforced composites with fibers oriented in the 1-direction, υ23 can be related to υ12 and υ21 using the following equation. υ23 = υ32 = υ12 * ((1 – υ21)/ (1 – υ12)). Thus, fits the experimental data within the range of experimental accuracy. Thus, for a unidirectional fiber-reinforced composite, the number of independent elastic constants is reduced from 5 to 4.

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