Prediction of plastic strain accumulation in continuous fiber reinforced laminates by a constitutive ply model

Abstract

The present paper is concerned with the prediction of plastic ply strains which accumulate in continuous fiber reinforced laminates with polymeric matrix materials. The study is based on a constitutive model which is implemented within the Finite Element Method. Plastic strains are expected to evolve when the ply is subjected to a pronounced shear load and/or to pronounced transverse compression. Two plasticity mechanisms are modeled at ply level under plane stress assumption (i.e. for thin shells and plates). They either concern the evolution of plastic shear strains or the evolution of plastic normal strains. The proposed plasticity model is combined with an existing ply level continuum damage model. The capabilities of the proposed model are assessed by comparing its predictions to experimental data from literature.Emphasis is placed on loading conditions which drive the evolution of plastic strains. Excellent correlation with experimental results is shown for proportional as well as for non-proportional ply loadings.

Continuum damage interactions between tension and compression in osteonal bone

“…Furthermore, micromechanics based approaches were used to model the closure of microcracks that appear as elliptic voids emerging in a matrix along predefined failure planes (Ladeveze, 1995;Guéry et al, 2008;Flatscher and Pettermann, 2011). In case of fibre reinforced composites different damage modes were associated with fibre and matrix damage (Schuecker and Pettermann, 2006;Maimí et al, 2007a,b;Flatscher et al, 2009;Flatscher and Pettermann, 2011). In case of bone tissue, a time dependent damage model was proposed for the tensile case in 1D (Fondrk et al, 1988).…”

Progressive failure analysis of carbon-fiber reinforced polymer (CFRP) laminates using combined material nonlinear elasticity and continuum damage mechanics based on treatment of coupon test

“…The nonlinearity of the shear modulus was described by showing the nonlinear shear response as a combination of the elastic and plastic response. [22][23][24] Papanicolaou et al 25 analyzed nonlinear viscoelasticity in the transverse direction of a unidirectional composite using Schapery's model 26,27 and a power law of viscoelastic compliance. Pettersson et al 28 tried to analyze nonlinear behavior by means of the viscoelastic response, which was complemented with the development of micro-damage as well as irreversible plastic strain, but without developing a material model.…”

Damage Analysis of 2D Woven Composite Laminates Containing an Open-Hole under Tensile Loadings

“…In recent years, more emphases mainly focus on the numerical investigation of composite with an open-hole. Flatscher, Schuecker and Pettermann [5][6][7][8] did the study of reinforced laminates' damage model and constitutive equation by finite element analysis. Lapczyk [9] established a damage model for predicting failure in fiber-reinforced materials.…”