In the present work, large deformation rate-dependent constitutive behavior of isotactic polypropylene is studied via an experimentally validated macroscale model. To analyze nonlinear response material, mechanical tests are conducted at room temperature and a phenomenological model proposed to describe viscoplastic yielding damage semicrystalline polymer. The based on finite elastic-viscoplast...

Abstract The concrete open-web sandwich slab is composed of the vierendeel girders intersecting each other. girder are upper rib, lower rib and shear key. mainly bear axial force, keys force. A double scalar elastic damage constitutive model considering was derived to accurately simulate mechanical property key in which one reflected volume damage, other damage. study, uniaxial tension compress...

Recent experiments on entangled polymer solutions may indicate a constitutive instability, and have led some to question the validity of existing constitutive models. We use a modern constitutive model, the Rolie-Poly model plus a solvent viscosity, and show that (i) this simple class of models captures instability, (ii) shear banding phenomena is observable for weakly stable fluids in flow geo...