A Multi-scale Framework for Thermo-viscoelastic Analysis of Fiber Metal Laminates

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Title: A Multi-scale Framework for Thermo-viscoelastic Analysis of Fiber Metal Laminates
Author: Sawant, Sourabh P.
Abstract: Fiber Metal Laminates (FML ) are hybrid composites with alternate layers of orthotropic fiber reinforced polymers (FRP ) and isotropic metal alloys . FML can exhibit a nonlinear thermo -viscoelastic behavior under the influence of external mechanical and non -mechanical stimuli . Such a behavior can be due to the stress and temperature dependent viscoelastic response in one or all of its constituents , namely , the fiber and matrix (within the FRP layers ) or the metal layers . To predict the overall thermoviscoelastic response of FML , it is necessary to incorporate different responses of the individual constituents through a suitable multi -scale framework . A multi -scale framework is developed to relate the constituent material responses to the structural response of FML . The multi -scale framework consists of a micromechanical model of unidirectional FRP for ply level homogenization . The upper (structural ) level uses a layered composite finite element (FE ) with multiple integration points through the thickness . The micromechanical model is implemented at these integration points . Another approach (alternative to use of layered composite element ) uses a sublaminate model to homogenize responses of the FRP and metal layers and integrate it to continuum 3D or shell elements within the FE code . Thermo -viscoelastic constitutive models of homogenous orthotropic materials are used at the lowest constituent level , i .e . , fiber , matrix , and metal in the framework . The nonlinear and time dependent response of the constituents requires the use of suitable correction algorithms (iterations ) at various levels in the multi -scale framework . The multi -scale framework can be efficiently used to analyze nonlinear thermo -viscoelastic responses of FML structural components . The multi -scale framework is also beneficial for designing FML materials and structures since different FML performances can be first simulated by varying constituent properties and microstructural arrangements .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2008 -12 -224
Date: 2010-01-14

Citation

A Multi-scale Framework for Thermo-viscoelastic Analysis of Fiber Metal Laminates. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2008 -12 -224 .

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