Structural health monitoring (SHM) methods based on the cumulative second harmonic Lamb waves show attractive advantages. An ideal nonlinear parameter should allow precise characterization of the cumulative effects of the distributed nonlinear sources such as the material nonlinearity of a plate (MNP), in the presence of other unavoidable localized nonlinear components. While highlighting the deficiencies of the traditional nonlinear parameter (TNP) in the nonplanar cases, a refined nonlinear parameter (RNP) is proposed. Through compensations for the wave attenuation associated with the wave divergence, the new parameter entails a better characterization and differentiation of the cumulative MNP and other noncumulative localized nonlinear sources. Theoretical findings are ascertained by both finite element (FE) simulations and experiments, through tactically adjusting the dominance level of different nonlinear sources in the system. Results confirm the appealing features of the proposed RNP for SHM applications.
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February 2018
Research-Article
Characterization of Nonplanar Second Harmonic Lamb Waves With a Refined Nonlinear Parameter
Shengbo Shan,
Shengbo Shan
Department of Mechanical Engineering,
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: 15900207r@connect.polyu.hk
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: 15900207r@connect.polyu.hk
Search for other works by this author on:
Li Cheng,
Li Cheng
Department of Mechanical Engineering,
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: li.cheng@polyu.edu.hk
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: li.cheng@polyu.edu.hk
Search for other works by this author on:
Fuzhen Wen
Fuzhen Wen
Department of Mechanical Engineering,
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: fuzhen.wen@connect.polyu.hk
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: fuzhen.wen@connect.polyu.hk
Search for other works by this author on:
Shengbo Shan
Department of Mechanical Engineering,
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: 15900207r@connect.polyu.hk
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: 15900207r@connect.polyu.hk
Li Cheng
Department of Mechanical Engineering,
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: li.cheng@polyu.edu.hk
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: li.cheng@polyu.edu.hk
Fuzhen Wen
Department of Mechanical Engineering,
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: fuzhen.wen@connect.polyu.hk
The Hong Kong Polytechnic University,
11 Yuk Choi Road, PolyU,
Kowloon 999077, Hong Kong
e-mail: fuzhen.wen@connect.polyu.hk
1Corresponding author.
Manuscript received May 24, 2017; final manuscript received July 31, 2017; published online September 29, 2017. Assoc. Editor: Shiro Biwa.
ASME J Nondestructive Evaluation. Feb 2018, 1(1): 011004-011004-12 (12 pages)
Published Online: September 29, 2017
Article history
Received:
May 24, 2017
Revised:
July 31, 2017
Citation
Shan, S., Cheng, L., and Wen, F. (September 29, 2017). "Characterization of Nonplanar Second Harmonic Lamb Waves With a Refined Nonlinear Parameter." ASME. ASME J Nondestructive Evaluation. February 2018; 1(1): 011004–011004–12. https://doi.org/10.1115/1.4037516
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