Effective Young’s modulus of orthotropic laminate with oriented unidirectional fibrous laminas

Abstract eng:
This report presents the derivation of formula for effective longitudinal Young's modulus of laminate composed of symmetrically oriented, unidirectionally reinforced laminas. Single lamina may be treated as an orthotropic layer when the directions of unidirectional reinforcement and tensile loading are the same. With orientation angle θ other than a multiple of π/2 the lamina becomes a monoclinic layer. Nevertheless, when the symmetrical sequence of oriented laminas is considered e.g. θ/-θ/-θ/θ, they constitute an orthotropic laminate as a whole. It is obvious that the effective Young's moduli of single monoclinic lamina and the resultant symmetrical orthotropic laminate should be different and they are, as it is shown in this report. For comparison the material constants of glass-polyester laminate have been applied.

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