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Title: An Elastic-Plastic Damage Model for Long-Fiber Thermoplastics

Abstract

This article proposes an elastic-plastic damage model that combines micromechanical modeling with continuum damage mechanics to predict the stress-strain response of injection-molded long-fiber thermoplastics. The model accounts for distributions of orientation and length of elastic fibers embedded in a thermoplastic matrix whose behavior is elastic-plastic and damageable. The elastic-plastic damage behavior of the matrix is described by the modified Ramberg-Osgood relation and the three-dimensional damage model in deformation assuming isotropic hardening. Fiber/matrix debonding is accounted for using a parameter that governs the fiber/matrix interface compliance. A linear relationship between this parameter and the matrix damage variable is assumed. First, the elastic-plastic damage behavior of the reference aligned-fiber composite containing the same fiber volume fraction and length distribution as the actual composite is computed using an incremental Eshelby-Mori-Tanaka mean field approach. The incremental response of the latter is then obtained from the solution for the aligned-fiber composite by averaging over all fiber orientations. The model is validated against the experimental stress-strain results obtained for long-glass-fiber/polypropylene specimens.

Authors:
;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
978526
Report Number(s):
PNNL-SA-62796
VT0505000; TRN: US201010%%6
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
International Journal of Damage Mechanics, 19(6):691-725
Additional Journal Information:
Journal Name: International Journal of Damage Mechanics, 19(6):691-725
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; THERMOPLASTICS; MATHEMATICAL MODELS; ELASTICITY; PLASTICITY; FIBERS; REINFORCED MATERIALS; DAMAGE; MATRIX MATERIALS; HARDENING; POLYPROPYLENE; Long-fiber thermoplastics, injection molding, fiber length distribution, fiber orientation, elastic-plastic, continuum damage, matrix cracking, fiber/matrix debonding, failure, strength.

Citation Formats

Nguyen, Ba Nghiep, and Kunc, Vlastimil. An Elastic-Plastic Damage Model for Long-Fiber Thermoplastics. United States: N. p., 2009. Web. doi:10.1177/1056789509338319.
Nguyen, Ba Nghiep, & Kunc, Vlastimil. An Elastic-Plastic Damage Model for Long-Fiber Thermoplastics. United States. https://doi.org/10.1177/1056789509338319
Nguyen, Ba Nghiep, and Kunc, Vlastimil. 2009. "An Elastic-Plastic Damage Model for Long-Fiber Thermoplastics". United States. https://doi.org/10.1177/1056789509338319.
@article{osti_978526,
title = {An Elastic-Plastic Damage Model for Long-Fiber Thermoplastics},
author = {Nguyen, Ba Nghiep and Kunc, Vlastimil},
abstractNote = {This article proposes an elastic-plastic damage model that combines micromechanical modeling with continuum damage mechanics to predict the stress-strain response of injection-molded long-fiber thermoplastics. The model accounts for distributions of orientation and length of elastic fibers embedded in a thermoplastic matrix whose behavior is elastic-plastic and damageable. The elastic-plastic damage behavior of the matrix is described by the modified Ramberg-Osgood relation and the three-dimensional damage model in deformation assuming isotropic hardening. Fiber/matrix debonding is accounted for using a parameter that governs the fiber/matrix interface compliance. A linear relationship between this parameter and the matrix damage variable is assumed. First, the elastic-plastic damage behavior of the reference aligned-fiber composite containing the same fiber volume fraction and length distribution as the actual composite is computed using an incremental Eshelby-Mori-Tanaka mean field approach. The incremental response of the latter is then obtained from the solution for the aligned-fiber composite by averaging over all fiber orientations. The model is validated against the experimental stress-strain results obtained for long-glass-fiber/polypropylene specimens.},
doi = {10.1177/1056789509338319},
url = {https://www.osti.gov/biblio/978526}, journal = {International Journal of Damage Mechanics, 19(6):691-725},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 11 00:00:00 EDT 2009},
month = {Tue Aug 11 00:00:00 EDT 2009}
}