Nested nonlinear viscoelastic and micromechanical models for the analysis of pultruded composite materials and structures
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The present study introduces analytical and numerical formulations in order to derive the effective nonlinear viscoelastic response of pultruded composite materials and structures. The studied pultruded composite system consists of two alternating layers reinforced with E-glass roving and continuous filament mat (CFM). Two 3D micromechanical models are used for the layers with roving and CFM, each having a unit-cell with four fiber and matrix subcells. A sublaminate model is also used to generate a nonlinear equivalent continuum of the layered medium. A new recursive-iterative procedure is introduced to integrate the Schapery nonlinear viscoelastic model used for the isotropic matrix subcells of the micromodels. An iterative numerical algorithm with predictor-corrector type steps is formulated for the sublaminate model and is used to interface with a nonlinear finite-element (FE). Off-axis creep compression and tension tests, with and without a circular hole, are performed for E-glass/vinylester and polyester pultruded plates to calibrate and predict the nonlinear viscoelastic response. The multiscale modeling approach shows good linear and nonlinear viscoelastic prediction compared with the experimental results. 2003 Elsevier Ltd. All rights reserved.
