Campus Units

Aerospace Engineering, Center for Nondestructive Evaluation (CNDE)

Document Type

Article

Publication Version

Published Version

Publication Date

2016

Journal or Book Title

The Journal of the Acoustical Society of America

Volume

139

Issue

5

First Page

2310

Last Page

2319

DOI

10.1121/1.4946996

Abstract

This paper presents the study of influence of laminate sequence and fabric type on the baseline acoustic nonlinearity of fiber-reinforced composites. Nonlinearelastic wave techniques are increasingly becoming popular in detecting damage in composite materials. It was earlier observed by the authors that the non-classical nonlinear response of fiber-reinforced composite is influenced by the fiber orientation [Chakrapani, Barnard, and Dayal, J. Acoust. Soc. Am. 137(2), 617–624 (2015)]. The current study expands this effort to investigate the effect of laminate sequence and fabric type on the non-classical nonlinear response. Two hypotheses were developed using the previous results, and the theory of interlaminar stresses to investigate the influence of laminate sequence and fabric type. Each hypothesis was tested by capturing the nonlinear response by performing nonlinear resonance spectroscopy and measuring frequency shifts, loss factors, and higher harmonics. It was observed that the laminate sequence can either increase or decrease the nonlinear response based on the stacking sequence. Similarly, tests were performed to compare unidirectional fabric and woven fabric and it was observed that woven fabric exhibited a lower nonlinearresponse compared to the unidirectional fabric. Conjectures based on the matrix properties and interlaminar stresses were used in an attempt to explain the observed nonlinear responses for different configurations.

Comments

This article is published as Chakrapani, Sunil Kishore, Daniel J. Barnard, and Vinay Dayal. "Influence of laminate sequence and fabric type on the inherent acoustic nonlinearity in carbon fiber reinforced composites." The Journal of the Acoustical Society of America 139, no. 5 (2016): 2310-2319.
DOI: 10.1121/1.4946996. Posted with permission.

Copyright Owner

Acoustical Society of America

Language

en

File Format

application/pdf

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