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Title: Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics

Abstract

This paper proposes a model to predict the elastic-plastic response of injection-molded long-fiber thermoplastics (LFTs). The model accounts for elastic fibers embedded in a thermoplastic resin that exhibits the elastic-plastic behavior obeying the Ramberg-Osgood relation and J-2 deformation theory of plasticity. It also accounts for fiber length and orientation distributions in the composite formed by the injection-molding process. Fiber orientation was predicted using an anisotropic rotary diffusion model recently developed for LFTs. An incremental procedure using Eshelby's equivalent inclusion method and the Mori-Tanaka assumption is proposed to compute the overall stress increment resulting from an overall strain increment for an aligned-fiber composite that contains the same fiber volume fraction and length distribution as the actual composite. The incremental response of the latter is then obtained from the solution for the aligned-fiber composite by averaging over all fiber orientations. Failure during incremental loading is predicted using the Van Hattum-Bernado model. The model is validated against the experimental stress-strain results obtained for long-glass-fiber/polypropylene specimens.

Authors:
 [1];  [2];  [3];  [3];  [1]
  1. Pacific Northwest National Laboratory (PNNL)
  2. ORNL
  3. University of Illinois, Urbana-Champaign
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1093017
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Composite Materials
Additional Journal Information:
Journal Volume: 43; Journal Issue: 3
Country of Publication:
United States
Language:
English
Subject:
Long-fiber thermoplastics; injection molding; fiber length distribution; fiber orientation; elastic-plastic behavior; failure; strength

Citation Formats

Nguyen, Ba N., Kunc, Vlastimil, Phelps, Jay H, TuckerIII, Charles L., and Bapanapalli, Satish K. Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics. United States: N. p., 2009. Web.
Nguyen, Ba N., Kunc, Vlastimil, Phelps, Jay H, TuckerIII, Charles L., & Bapanapalli, Satish K. Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics. United States.
Nguyen, Ba N., Kunc, Vlastimil, Phelps, Jay H, TuckerIII, Charles L., and Bapanapalli, Satish K. 2009. "Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics". United States.
@article{osti_1093017,
title = {Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics},
author = {Nguyen, Ba N. and Kunc, Vlastimil and Phelps, Jay H and TuckerIII, Charles L. and Bapanapalli, Satish K},
abstractNote = {This paper proposes a model to predict the elastic-plastic response of injection-molded long-fiber thermoplastics (LFTs). The model accounts for elastic fibers embedded in a thermoplastic resin that exhibits the elastic-plastic behavior obeying the Ramberg-Osgood relation and J-2 deformation theory of plasticity. It also accounts for fiber length and orientation distributions in the composite formed by the injection-molding process. Fiber orientation was predicted using an anisotropic rotary diffusion model recently developed for LFTs. An incremental procedure using Eshelby's equivalent inclusion method and the Mori-Tanaka assumption is proposed to compute the overall stress increment resulting from an overall strain increment for an aligned-fiber composite that contains the same fiber volume fraction and length distribution as the actual composite. The incremental response of the latter is then obtained from the solution for the aligned-fiber composite by averaging over all fiber orientations. Failure during incremental loading is predicted using the Van Hattum-Bernado model. The model is validated against the experimental stress-strain results obtained for long-glass-fiber/polypropylene specimens.},
doi = {},
url = {https://www.osti.gov/biblio/1093017}, journal = {Journal of Composite Materials},
number = 3,
volume = 43,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2009},
month = {Thu Jan 01 00:00:00 EST 2009}
}