In recent years, nonlinear vibro-acoustic methods have shown potential to identify defects which are difficult to detect using linear ultrasonic methods. However, these methods come with their own challenges such as frequency dependence, requirement for a high excitation amplitude, and difficulties in distinguishing nonlinearity from defect with nonlinearity from other sources to name a few. This paper aims to study the dependence of nonlinear vibro-acoustic methods for detection of delaminations inside a composite laminate, on the excitation methods and excitation frequencies. It is shown that nonlinear vibro-acoustic methods are highly frequency dependent and commonly used excitation signals which utilize particular values of excitation frequencies might not always lead to a clear distinction between intact and delaminated regions of the specimen. To overcome the frequency dependence, signals based on frequency sweep are used. Interpretation of output response to sweep signals to identify damage is demonstrated using an earlier available approach, and a simpler approach is proposed. It is demonstrated that the damage detection with sweep signal excitations is relatively less dependent on excitation frequency than the conventional excitation methods. The proposed interpretation technique is then applied to specimens with delamination of varying sizes and with delaminations at different depths inside the laminate to demonstrate its effectiveness.
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February 2019
Research-Article
Experimental Investigations Into Nonlinear Vibro-Acoustics for Detection of Delaminations in a Composite Laminate
Ashish Kumar Singh,
Ashish Kumar Singh
Department of Mechanical Engineering,
National University of Singapore,
9 Engineering Drive 1,
Singapore 117575
National University of Singapore,
9 Engineering Drive 1,
Singapore 117575
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Vincent B. C. Tan,
Vincent B. C. Tan
Department of Mechanical Engineering,
National University of Singapore,
Singapore 117575
e-mail: mpetanbc@nus.edu.sg
National University of Singapore,
9 Engineering Drive 1
, Singapore 117575
e-mail: mpetanbc@nus.edu.sg
Search for other works by this author on:
Tong Earn Tay,
Tong Earn Tay
Department of Mechanical Engineering,
National University of Singapore,
Singapore 117575
National University of Singapore,
9 Engineering Drive 1
, Singapore 117575
Search for other works by this author on:
Heow Pueh Lee
Heow Pueh Lee
Department of Mechanical Engineering,
National University of Singapore,
Singapore 117575
National University of Singapore,
9 Engineering Drive 1
, Singapore 117575
Search for other works by this author on:
Ashish Kumar Singh
Department of Mechanical Engineering,
National University of Singapore,
9 Engineering Drive 1,
Singapore 117575
National University of Singapore,
9 Engineering Drive 1,
Singapore 117575
Vincent B. C. Tan
Department of Mechanical Engineering,
National University of Singapore,
Singapore 117575
e-mail: mpetanbc@nus.edu.sg
National University of Singapore,
9 Engineering Drive 1
, Singapore 117575
e-mail: mpetanbc@nus.edu.sg
Tong Earn Tay
Department of Mechanical Engineering,
National University of Singapore,
Singapore 117575
National University of Singapore,
9 Engineering Drive 1
, Singapore 117575
Heow Pueh Lee
Department of Mechanical Engineering,
National University of Singapore,
Singapore 117575
National University of Singapore,
9 Engineering Drive 1
, Singapore 117575
1Corresponding author.
Manuscript received March 22, 2018; final manuscript received August 2, 2018; published online September 17, 2018. Assoc. Editor: Hoon Sohn.
ASME J Nondestructive Evaluation. Feb 2019, 2(1): 011002-011002-11 (11 pages)
Published Online: September 17, 2018
Article history
Received:
March 22, 2018
Revised:
August 2, 2018
Citation
Singh, A. K., Tan, V. B. C., Tay, T. E., and Lee, H. P. (September 17, 2018). "Experimental Investigations Into Nonlinear Vibro-Acoustics for Detection of Delaminations in a Composite Laminate." ASME. ASME J Nondestructive Evaluation. February 2019; 2(1): 011002–011002–11. https://doi.org/10.1115/1.4041122
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