Numerical and analytical scale-transition prediction of hygro-mechanical stresses in multidirectional carbon-epoxy laminates
Résumé
Moisture diffusion within an epoxy matrix based composite structure exposed to humid
environmental conditions induces two types of internal stresses: the macroscopic stresses (at the
scale of the composite plies) and the microscopic stresses (experienced by the elementary
constituents of a considered ply). Macroscopic stresses induced by gradients of moisture
concentration and/or the heterogeneity of the coefficients of moisture expansion are determined
using continuum mechanics classical formalism. This method enables taking into account both
space and time effects on moisture diffusion in the composite structure. Localization of the
macroscopic mechanical states at microscopic scale lead to different stresses in the matrix and the
fiber. The discrepancies come from the strong heterogeneities of elastic properties, coefficients of
moisture expansion and moisture content of the composite plies constituents. Scale transition
models are often used in order to achieve the localization procedure.
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