Page 327 - Introduction to Continuum Mechanics

Engineering Constants for Orthotropic Elastic Solid 311

i.e.,

Also,

5.30 Engineering Constants for Orthotropic Elastic Solid

For an Orthotropic elastic solid, the symmetric stiffness matrix with nine independent
coefficients can be inverted to give a symmetric compliance matrix with also nine independent
constants. The compliance matrix is

The meanings of the constants in the compliance matrix can be obtained in the same way as
in the previous section for the transversely isotropic solid. We have, E\, £"2 and £3 are
Young's moduli in the ej, 62 ,e 3 directions respectively, 023,031 and G\i are shear moduli