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...

In the present work, a set of physically-based failure criteria are applied to cross-ply Non-Crimp Fabric (NCF) composite. The proposed account for stitch reinforcement and induced in- out-of-plane fibre misalignment. A distinction between matrix failures in tension compression is introduced, while in-plane shear non-linear response directly incorporated model as well. constitutive associated w...

The present paper presents an investigation and analysis study of the effect head shapes impactor on damages observed during low-velocity impact T700/Epoxy composite laminate. Two types impactors were investigated: hemispherical flat-face. A new criterion based LARC05 damage model was linked as a LARC_VUMAT subroutine to simulate explore effects form shape through three-dimensional finite eleme...

In this paper, we have modified the stress integration scheme proposed by Choi and Yoon [1]; which is based on numerical approximation of yield function gradients, to implement in finite element code ABAQUS three elastic isotropic, plastic anisotropic constitutive models with yielding described Yld2004-18p [2], CPB06ex2 [3] Yld2011-27p [4] criteria, respectively. We developed both VUMAT UMAT su...

Understanding the effect of thermomechanical loads during finish cutting processes, in our case hard milling, on surface integrity workpiece is crucial for creation defined quality characteristics high-performance components. Compared to computationally generated modifications by simulation, measurement-based determination material can only be carried out selectively and a point-by-point basis....