Orthotropic Material

The material properties are

– Young’s modulus in the x direction

– Young’s modulus in the y direction

– Young’s modulus in the z direction

– shear modulus in the xy plane

– shear modulus in the yz plane

– shear modulus in the zx plane

– Poisson’s ratio, y direction strain generated by unit strain in the x direction

– Poisson’s ratio, z direction strain generated by unit strain in the y direction

– Poisson’s ratio, x direction strain generated by unit strain in the z direction

The other three Poisson's ratios can be obtained from the following relationships.

The general elasticity matrix is

The following conditions must be met with regard to the Poisson's ratios

and