If the material is monoclinic (i.e., material properties are symmetric about one plane), the number of independent material constants reduces to 13. For instance, if the plane defined by the x2-x3 (or y-z)

Stress, a

Stress, a

FIGURE 1.6 Uniaxial stress-strain curve.

axes is the plane of symmetry, the stress-strain relationship takes the form


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