A damage constitutive model of progressive debonding in aligned discontinuous fiber composites

H. K. Lee; S. Simunovic

doi:10.1016/S0020-7683(00)00060-3

A damage constitutive model of progressive debonding in aligned discontinuous fiber composites

H. K. Lee, S. Simunovic

Multiscale Materials

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

A micromechanical damage constitutive model is presented to predict the overall elastoplastic behavior and damage evolution in aligned discontinous fiber polymer composites (AFPCs). In an attempt to estimate the overall elastoplastic-damage responses, an effective yield criterion is micromechanically derived based on the ensemble-volume averaging process and first-order (noninteracting) effects of eigenstrains stemming from the existence of (prolate) spheroidal fibers. The proposed effective yield criterion, in conjunction with the assumed overall associative plastic flow rule and hardening law, provides analytical foundation for the estimation of effective elastoplastic behavior of ductile matrix composites. Uniaxial elastoplastic stress-strain behavior of AFPCs is also investigated. An evolutionary interfacial debonding is subsequently employed in accordance with Weibull's probability function to characterize the varying probability of fiber debonding. Finally, the present damage model is compared with Halpin-Tsai's bounds for stiffness predictions and is applied to uniaxial loading to illustrate the damage behavior of AFPCs.

Original language	English
Pages (from-to)	875-895
Number of pages	21
Journal	International Journal of Solids and Structures
Volume	38
Issue number	5
DOIs	https://doi.org/10.1016/S0020-7683(00)00060-3
State	Published - 2001

Funding

This research was sponsored by the US Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, Lightweight Materials Program, under the contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corporation. The research was supported in part by an appointment to the Oak Ridge National Laboratory Postdoctoral Research Associates Program administered jointly by the Oak Ridge National Laboratory and the Oak Ridge Institute for Science and Education.

Funders	Funder number
Lockheed Martin Energy Research Corporation
Oak Ridge National Laboratory
Office of Transportation Technologies	DE-AC05-96OR22464
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory
Oak Ridge Institute for Science and Education

Keywords

Damage constitutive model
Elastoplastic behavior
Progressive debonding
Weibull's probability function

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10.1016/S0020-7683(00)00060-3

Cite this

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title = "A damage constitutive model of progressive debonding in aligned discontinuous fiber composites",

abstract = "A micromechanical damage constitutive model is presented to predict the overall elastoplastic behavior and damage evolution in aligned discontinous fiber polymer composites (AFPCs). In an attempt to estimate the overall elastoplastic-damage responses, an effective yield criterion is micromechanically derived based on the ensemble-volume averaging process and first-order (noninteracting) effects of eigenstrains stemming from the existence of (prolate) spheroidal fibers. The proposed effective yield criterion, in conjunction with the assumed overall associative plastic flow rule and hardening law, provides analytical foundation for the estimation of effective elastoplastic behavior of ductile matrix composites. Uniaxial elastoplastic stress-strain behavior of AFPCs is also investigated. An evolutionary interfacial debonding is subsequently employed in accordance with Weibull's probability function to characterize the varying probability of fiber debonding. Finally, the present damage model is compared with Halpin-Tsai's bounds for stiffness predictions and is applied to uniaxial loading to illustrate the damage behavior of AFPCs.",

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N2 - A micromechanical damage constitutive model is presented to predict the overall elastoplastic behavior and damage evolution in aligned discontinous fiber polymer composites (AFPCs). In an attempt to estimate the overall elastoplastic-damage responses, an effective yield criterion is micromechanically derived based on the ensemble-volume averaging process and first-order (noninteracting) effects of eigenstrains stemming from the existence of (prolate) spheroidal fibers. The proposed effective yield criterion, in conjunction with the assumed overall associative plastic flow rule and hardening law, provides analytical foundation for the estimation of effective elastoplastic behavior of ductile matrix composites. Uniaxial elastoplastic stress-strain behavior of AFPCs is also investigated. An evolutionary interfacial debonding is subsequently employed in accordance with Weibull's probability function to characterize the varying probability of fiber debonding. Finally, the present damage model is compared with Halpin-Tsai's bounds for stiffness predictions and is applied to uniaxial loading to illustrate the damage behavior of AFPCs.

AB - A micromechanical damage constitutive model is presented to predict the overall elastoplastic behavior and damage evolution in aligned discontinous fiber polymer composites (AFPCs). In an attempt to estimate the overall elastoplastic-damage responses, an effective yield criterion is micromechanically derived based on the ensemble-volume averaging process and first-order (noninteracting) effects of eigenstrains stemming from the existence of (prolate) spheroidal fibers. The proposed effective yield criterion, in conjunction with the assumed overall associative plastic flow rule and hardening law, provides analytical foundation for the estimation of effective elastoplastic behavior of ductile matrix composites. Uniaxial elastoplastic stress-strain behavior of AFPCs is also investigated. An evolutionary interfacial debonding is subsequently employed in accordance with Weibull's probability function to characterize the varying probability of fiber debonding. Finally, the present damage model is compared with Halpin-Tsai's bounds for stiffness predictions and is applied to uniaxial loading to illustrate the damage behavior of AFPCs.

KW - Damage constitutive model

KW - Elastoplastic behavior

KW - Progressive debonding

KW - Weibull's probability function

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A damage constitutive model of progressive debonding in aligned discontinuous fiber composites

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Keywords

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