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

Nguyen, Ba Nghiep; Bapanapalli, Satish K; Kunc, Vlastimil; Phelps, Jay; Tucker, III, Charles L

doi:10.1177/0021998308099219

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

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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 the anisotropic rotary diffusion model recently developed by Phelps and Tucker for LFTs. An incremental procedure using the Eshelby’s equivalent inclusion method and the Mori-Tanaka model 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 later is then obtained from the solution for the aligned fiber composite that is averaged over all possible fiber orientations using the orientation averaging method. Failure during incremental loading is predicted using the Van Hattum-Bernado model. The elastic-plastic and strength prediction model for LFTs was validated against the experimental stress-strain results obtained for long glass fiber/polypropylene specimens.

Authors:: Nguyen, Ba Nghiep; Bapanapalli, Satish K; Kunc, Vlastimil; Phelps, Jay; Tucker, III, Charles L

Publication Date:: Mon Jan 26 00:00:00 EST 2009

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 947026

Report Number(s):: PNNL-SA-58610
VT0505000; TRN: US200904%%309

DOE Contract Number:: AC05-76RL01830

Resource Type:: Journal Article

Journal Name:: Journal of Composite Materials, 43(3):217-246

Additional Journal Information:: Journal Volume: 43; Journal Issue: 3

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; REINFORCED MATERIALS; FIBERS; ELASTICITY; PLASTICITY; STRAINS; THERMOPLASTICS; MATHEMATICAL MODELS; RESPONSE FUNCTIONS; ORIENTATION; Long-fiber thermoplastics, injection molding, fiber length distribution, fiber orientation, elastic-plastic behavior, failure, strength.

Citation Formats


                    Nguyen, Ba Nghiep, Bapanapalli, Satish K, Kunc, Vlastimil, Phelps, Jay, and Tucker, III, Charles L. Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics.  United States: N. p., 2009. 
        Web.  doi:10.1177/0021998308099219.

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                    Nguyen, Ba Nghiep, Bapanapalli, Satish K, Kunc, Vlastimil, Phelps, Jay, & Tucker, III, Charles L. Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics.  United States.  https://doi.org/10.1177/0021998308099219

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                    Nguyen, Ba Nghiep, Bapanapalli, Satish K, Kunc, Vlastimil, Phelps, Jay, and Tucker, III, Charles L. 2009.  
        "Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics".  United States.  https://doi.org/10.1177/0021998308099219.

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@article{osti_947026,

  title        = {Prediction of the Elastic-Plastic Stress/Strain Response for Injection-Molded Long-Fiber Thermoplastics},

  author       = {Nguyen, Ba Nghiep and Bapanapalli, Satish K and Kunc, Vlastimil and Phelps, Jay and Tucker, III, Charles L},

  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 the anisotropic rotary diffusion model recently developed by Phelps and Tucker for LFTs. An incremental procedure using the Eshelby’s equivalent inclusion method and the Mori-Tanaka model 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 later is then obtained from the solution for the aligned fiber composite that is averaged over all possible fiber orientations using the orientation averaging method. Failure during incremental loading is predicted using the Van Hattum-Bernado model. The elastic-plastic and strength prediction model for LFTs was validated against the experimental stress-strain results obtained for long glass fiber/polypropylene specimens.},

  doi          = {10.1177/0021998308099219},

  url          = {https://www.osti.gov/biblio/947026},
  journal      = {Journal of Composite Materials, 43(3):217-246},
number       = 3,

  volume       = 43,

  place        = {United States},

  year         = {Mon Jan 26 00:00:00 EST 2009},

  month        = {Mon Jan 26 00:00:00 EST 2009}

}

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