Reliability in the characterization of fiber length distributions of injection molded long carbon fiber composites

Sharma, Bhisham N.; Kijewski, Seth A.; Fifield, Leonard S.; Shin, Yongsoon; Tucker, Charles L.; Sangid, Michael D.

doi:10.1002/pc.24571

Reliability in the characterization of fiber length distributions of injection molded long carbon fiber composites

Journal Article · Thu Aug 10 00:00:00 EDT 2017 · Polymer Composites

DOI:https://doi.org/10.1002/pc.24571· OSTI ID:1496569

^[1]; Kijewski, Seth A. ^[1]; Fifield, Leonard S. ^[2]; Shin, Yongsoon ^[2]; ^[3]; ^[1]

School of Aeronautics and AstronauticsPurdue UniversityWest Lafayette Indiana47907
Pacific Northwest National LaboratoryRichland Washington99354
Department of Mechanical Science and EngineeringUniversity of Illinois at Urbana‐Champaign Urbana Illinois61801

The mechanical properties of a discontinuous fiber reinforced composite material are dependent on the length of the reinforcing fibers. Long-fiber thermoplastic (LFT) composites offer a compromise between ease of manufacture and mechanical properties for structural applications and are conventionally made using fibers that are initially 10–14 mm long. However, fiber attrition during the injection molding process significantly reduces the final fiber lengths in molded composite and produces a fiber length distribution (FLD), which depends on the processing parameters. Thus, accurate FLD measurements are important for reliable predictions of the composite properties. Here, we present a detailed methodology for experimentally measuring the FLD in LFT composites based on best practices. Possible biases occurring during the measurement process are discussed and their effect on the measured FLD and averaged fiber length values are evaluated. We then employ a Mori–Tanaka implementation of the Eshelby model to predict the elastic stiffness of the LFT composite and analyze the sensitivity of the stiffness values to the biases in the FLD measurements.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1496569

Report Number(s):: PNNL-SA-122679

Journal Information:: Polymer Composites, Journal Name: Polymer Composites Journal Issue: 12 Vol. 39; ISSN 0272-8397

Publisher:: Wiley

Country of Publication:: United States

Language:: English

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