Effective Elastoplastic Damage Mechanics for Fiber-reinforced Composites with Evolutionary Complete Fiber Debonding

a b s t r a c tBased on the micromechanics-based constitutive model, derived in our preceding work . A 3D-damage model for fiber-reinforced brittle composites with microcracks and imperfect , incorporating a multi-level damage model and a continuum damage model, the overall elastic behavior and damage evolution of laminated composite structures are studied in detail. The constitutive model is implemented into the finite element program ABAQUS using a user-subroutine UMAT to solve boundary value problems of the composite structures. The validity of the implemented constitutive model is assured by comparing the predicted stress-strain curves with experimental data available in literature under uniaxial tension with various fiber orientations. The results show that the proposed micromechanics-based constitutive model accurately predict the overall elastic-damage behavior of laminated composite structures having different material compositions, thicknesses and boundary conditions.

mentioning

confidence: 99%

Micromechanics-based elastic-damage analysis of laminated composite structures

Pyo¹,

Lee²

2009

“…(31) can be rephrased for the uniaxial loading case as (Ju and Zhang, 2001;Ju et al, 2006) Fð r 11 ; e p Þ ¼ ð1 À / 1 Þ ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi ðT 1 þ 2T 2 Þ q r 11 À ffiffiffi 2 3 r fr y þ hð e p Þ q g ð 34Þ…”

Section: Elastoplastic Stress-strain Relation Under Uniaxial Tensionmentioning

confidence: 99%

Elastoplastic modeling of circular fiber-reinforced ductile matrix composites considering a finite RVE

Kim

Lee

2010

a b s t r a c tA micromechanical elastoplastic damage model considering a finite RVE is proposed to predict the overall elastoplastic damage behavior of circular fiber-reinforced ductile (matrix) composites. The constitutive damage model proposed in our preceding work (Kim and Lee, 2009) considering a finite Eshelby's tensor Wang et al., 2005) is extended to accommodate the elastoplastic behavior of the composites. On the basis of the exterior-point Eshelby's tensor for circular inclusions and the ensemble-averaged effective yield criterion, a micromechanical framework for predicting the effective elastoplastic damage behavior of ductile composites is derived. A series of numerical simulations are carried out to illustrate stress-strain response of the proposed micromechanical framework and to examine the influence of a Weibull parameter on the elastoplastic behavior of the composites. Furthermore, comparisons between the present predictions and experimental data available in the literature are made to further assess the predictive capability of the proposed model.

“…Following the work of Ju and Chen (1994c), Lee (2000, 2001), Sun et al (2003), Ju et al (2006) and Ju and Ko (in press), a micromechanical framework, where an ensemble-averaged yield criterion is constructed for the entire composite and only the first-order effects are considered in the formulation of effective plastic response, is employed.…”

Section: Overviewmentioning

confidence: 99%

An elastoplastic multi-level damage model for ductile matrix composites considering evolutionary weakened interface

Lee

Pyo

2008

An elastoplastic multi-level damage model considering evolutionary weakened interface is developed in this work to predict the effective elastoplastic behavior and multi-level damage evolution in particle reinforced ductile matrix composites (PRDMCs). The elastoplastic multi-level damage model is micromechanically derived on the basis of the ensemble-volume averaging procedure and the first-order effects of eigenstrains. The Eshelby's tensor for an ellipsoidal inclusion with slightly weakened interface [Qu, J., 1993a. Eshelby tensor for an elastic inclusion with slightly weakened interfaces. Journal of Applied Mechanics 60 (4), 1048-1050; Qu, J., 1993b. The effect of slightly weakened interfaces on the overall elastic properties of composite materials. Mechanics of Materials, 14, 269-281] is adopted to model particles having mildly or severely weakened interface, and a multi-level damage model [Lee, H.K., Pyo, S.H., in press. Multi-level modeling of effective elastic behavior and progressive weakened interface in particulate composites. Composites Science and Technology] in accordance with the Weibull's probabilistic function is employed to describe the sequential, progressive weakened interface in the composites. Numerical examples corresponding to uniaxial, biaxial and triaxial tension loadings are solved to illustrate the potential of the proposed micromechanical framework. A series of parametric analysis are carried out to investigate the influence of model parameters on the progression of weakened interface in the composites. Furthermore, the present prediction is compared with available experimental data in the literature to verify the proposed elastoplastic multi-level damage model.