Fiber orientation evaluation in reinforced composites using digital image correlation and thermal excitation

Ryan Spencer; Shailesh Alwekar; Eonyeon Jo; Ahmed Arabi Hassen; Seokpum Kim; Uday Vaidya

doi:10.1016/j.compositesb.2022.109713

Fiber orientation evaluation in reinforced composites using digital image correlation and thermal excitation

Ryan Spencer, Shailesh Alwekar, Eonyeon Jo, Ahmed Arabi Hassen, Seokpum Kim, Uday Vaidya

Composites Innovation

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11 Scopus citations

Abstract

A digital image correlation (DIC) nondestructive evaluation (NDE) method for determining fiber orientation in a composite material was developed. Fiber orientation is a crucial factor that influences the mechanical and thermal properties of fiber reinforced composites. By thermally exciting the composite surface, DIC measured the strain difference axial and transverse to the fiber axis to determine fiber orientation. A 2.7x increase in strain transverse to the fiber axis was observed compared to the longitudinal axis. The transverse direction experiences a larger strain of 0.00445 m/m due to the higher thermal expansion in the surrounding polymer matrix than the fiber direction which resists expansion and resulted a 0.00166 m/m strain. DIC provides a full-field qualitative measurement for fiber orientation while maintaining high resolution. This innovative method is in a preliminary stage and has been developed to fill the gap/limitations of complementary NDE methods.

Original language	English
Article number	109713
Journal	Composites Part B: Engineering
Volume	234
DOIs	https://doi.org/10.1016/j.compositesb.2022.109713
State	Published - Apr 1 2022

Funding

This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). This study was funded in part by the Office of Energy Efficiency and Renewable Energy , US Department of Energy under IACMI-The Composites Institute Award Number DE-EE0006926 . We thank the Institute of Advanced Composites Manufacturing Innovation (IACMI), Knoxville, TN, USA for partial support of this work, as well as the Manufacturing Demonstration Facility, Oak Ridge National Laboratory in Tennessee, USA for facilities and financial support. We thank Dr. Chad Duty for allowing access to his TMA equipment and Dr. Christopher Hershey for using his IR camera.

Funders	Funder number
Institute of Advanced Composites Manufacturing Innovation
Oak Ridge National Laboratory
U.S. Department of Energy	DE-EE0006926
Office of Energy Efficiency and Renewable Energy

Keywords

Coefficient of linear thermal expansion
Digital image correlation
Fiber orientation
Nondestructive evaluation
Thermoplastic composites

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10.1016/j.compositesb.2022.109713

Cite this

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title = "Fiber orientation evaluation in reinforced composites using digital image correlation and thermal excitation",

abstract = "A digital image correlation (DIC) nondestructive evaluation (NDE) method for determining fiber orientation in a composite material was developed. Fiber orientation is a crucial factor that influences the mechanical and thermal properties of fiber reinforced composites. By thermally exciting the composite surface, DIC measured the strain difference axial and transverse to the fiber axis to determine fiber orientation. A 2.7x increase in strain transverse to the fiber axis was observed compared to the longitudinal axis. The transverse direction experiences a larger strain of 0.00445 m/m due to the higher thermal expansion in the surrounding polymer matrix than the fiber direction which resists expansion and resulted a 0.00166 m/m strain. DIC provides a full-field qualitative measurement for fiber orientation while maintaining high resolution. This innovative method is in a preliminary stage and has been developed to fill the gap/limitations of complementary NDE methods.",

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AU - Vaidya, Uday

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Fiber orientation evaluation in reinforced composites using digital image correlation and thermal excitation

Abstract

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Keywords

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