000004776 001__ 4776
000004776 005__ 20141119144552.0
000004776 04107 $$aeng
000004776 046__ $$k2002-06-02
000004776 100__ $$aMuliana, Anastasia
000004776 24500 $$aTHREE-DIMENSIONAL MICROMECHANICAL FRAMEWORK FOR THE NONLINEAR VISCOELASTIC ANALYSIS OF PULTRUDED COMPOSITES

000004776 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004776 260__ $$bColumbia University in the City of New York
000004776 506__ $$arestricted
000004776 520__ $$2eng$$aThis study introduces a new three-dimensional (3D) micromechanical modeling approach for the nonlinear viscoelastic response of pultruded composites. The pultruded fiber reinforced plastic (FRP) composites under consideration include combinations of roving and continuous filament mat (CFM) reinforcements. The proposed framework can be easily integrated with a finite element (FE) software for the analysis of pultruded structures. The proposed 3D framework consists of three nested and independent models for the roving layers, CFM layers, and a sublaminate model used to generate the overall 3D effective continuum response. The roving layer consists of unidirectional fibers embedded in the matrix; it is idealized as doubly periodic array of fiber with rectangular cross sections. The CFM layer consists of long, swirl, and in-plane randomly oriented filaments. This system is idealized using the average response of two alternating layers with limiting fiber orientations. A 3D nonlinear multi-axial viscoelastic constitutive behavior is formulated using Schapery's integral form. This model is implemented only for the isotropic matrix at the lower level of the nested modeling framework. The fiber medium is considered as transversely isotropic and linear elastic. Stress-update algorithms are needed at all levels of the framework in order to satisfy the nonlinear constitutive and micromechanical relations between the average stresses and strains in the subcells. New iterative numerical algorithms with predictor- corrector type steps are derived to achieve the correct stress and strain states. Experimental tests are performed to calibrate and predict the nonlinear viscoelastic response. These tests include creep and recovery at different loading levels. 

000004776 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004776 653__ $$a

000004776 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004776 720__ $$aMuliana, Anastasia$$iHaj-Ali, Rami
000004776 8560_ $$ffischerc@itam.cas.cz
000004776 8564_ $$s441291$$uhttp://invenio.itam.cas.cz/record/4776/files/323.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004776 962__ $$r4594
000004776 980__ $$aPAPER