Three Dimensional Effective Elastic Constants For Thick Laminates

Equivalent homogeneous anisotropic solids are used to represent thick laminates con sisting of large numbers of a repeating sublaminate.

Three dimensional effective elastic constants for thick laminates.

This paper presents an analytical micromechanics model for predicting the three dimensional effective elastic properties of multidirectional composite laminates with ply wrinkle defects. Three dimensional effective elastic constants for thick laminates. Three dimensional effective elastic constants for thick laminates. Three dimensional effective elastic constants for thick laminates sun c.

The typical sublaminate is used for studying its load deformation behavior from which the effective elastic constants are derived from. A representative volume element rve was chosen for analysis and the geometry of wavy plies in the wrinkled laminates was described by sinusoidal functions. N is the total number of plies in the laminate. The effective elastic constants in three dimensions were then determined by assuming that all layers in any given sub laminate experienced the same in plane strains and the same i e.

A three dimensional constitutive theory for fiber composite laminated media. 1988jcoma 22 629s full text sources. Three dimensional effective moduli are used in the analysis of thick laminates consisting of a large number of identical sublaminates. The typical sublaminate is used for studying its load deformation behavior from which the effective elastic constants are derived from the constituent lamina properties.

Equivalent homogeneous anisotropic solids are used to represent thick laminates con sisting of large numbers of a repeating sublaminate. Three dimensional effective moduli of orthotropic and symmetric laminates. Journal of applied mechanics. A global local method is developed in which the effective modulus theory is used to model the thick laminate except for the local region where accurate stresses are desired.

Constant through thickness direct and shear stresses. Journal of applied mechanics. Journal of composite materials. To determine the thermo elastic properties of laminate utilizing the three dimensional laminate theory two stage coordinate conversion is applied to the effective compliance and the thermal expansion coefficient of the k th ply k 1 2 n.

Two damage parameters associated with tensile and shear damage are formulated as functions of ply crack density using local stress fields that satisfy the equilibrium equations. The thickness of the sub laminates was assumed to be small compared with the thickness of the overall laminate.