COMPRESSION CREEP RUPTURE OF ANE-GLASS/VINYL ESTER COMPOSITE:ANALYTICAL MODELING

摘要

The growing use of polymer matrix composites in civil infrastructure, marine andrnmilitary applications provides the impetus for developing mechanical models to describerntheir response under combined mechanical loading and fire. Although much research hasrnbeen performed to improve the flammability, fire resistance, and elevated temperaturernperformance of these composite systems, an understanding of the structural responsernunder fire loading conditions is still incomplete. The main goal of the modeling effortrnunder way at Virginia Tech is to develop analytical models and finite element methodsrnand tools to predict limit state variables such as deflection, local compression failure duernto micro-buckling, residual strength as a function of the thermo - mechanical evolution ofrnmaterial properties, and times to failure. Given the importance of compressive loading atrnelevated temperatures in the structural fire response of these structures, we focus on:rn(a) Characterization of the nonlinear viscoelastic response of the E-glass/vinylrnester composite at and above the glass transition temperature.rn(b) Description of the laminate compression mechanics as a function of stress andrntemperature including viscoelasticity.rn(c) Integrating the modeling results into a classical lamination theory (CLT) andrnfinite element (FE) code.rnTo date the first two objectives have been completed along with a CLT implementation;rnhowever, the FE code development is still underway.