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Research Papers

Measurements of Through-Thickness Young's Moduli of Fibrous Composite Laminates Using Nanoindentation

[+] Author and Article Information
L. Roy Xu

Department of Mechanical Engineering,
University of New Mexico,
Albuquerque, NM 87131
e-mail: luoyu.xu@yahoo.com

Ricardo Martinez

Department of Mechanical Engineering,
University of Texas,
El Paso, TX 79968
e-mail: ricardo_569@hotmail.com

Kai Zhao

Department of Mechanical Engineering,
University of Texas,
El Paso, TX 79968
e-mail: kaizhao127@gmail.com

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received October 23, 2018; final manuscript received January 30, 2019; published online March 11, 2019. Assoc. Editor: Vikas Tomar.

J. Eng. Mater. Technol 141(3), 031007 (Mar 11, 2019) (5 pages) Paper No: MATS-18-1291; doi: 10.1115/1.4042746 History: Received October 23, 2018; Accepted January 31, 2019

A new approach of measuring through-thickness Young's moduli of composite materials using nanoindentation was proposed. First, an approximate expression of the reduced modulus of nanoindentation was introduced for orthotropic composites. Second, spherical nanoindentation was conducted for an E-glass fiber/vinyl ester composite system, and measured Young's modulus was quite consistent with the previously reported value for a similar material system.

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Figures

Grahic Jump Location
Fig. 3

Typical elastic nanoindentation loading/unloading curves of a composite laminate

Grahic Jump Location
Fig. 2

Spherical nanoindentation along the thickness direction (z or 3-direction) of a woven-fabric composite laminate

Grahic Jump Location
Fig. 1

A typical load–displacement curve for a nanoindentation process

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