scholarly journals Detection and monitoring of axial cracks on cylindrical structures using torsional wave generated by piezoelectric macro-fiber composite

2012 ◽  
Author(s):  
Lin Cui ◽  
Say Ian Lim ◽  
Miao Shi ◽  
Yu Liu ◽  
Chee Kiong Soh
Keyword(s):  
Fiber Composite ◽  
Torsional Wave ◽  
Cylindrical Structures ◽  
Macro Fiber Composite

Macro-Fiber Composite Actuators for Flow Control of a Variable Camber Airfoil

2010 ◽  
Vol 22 (1) ◽  
pp. 81-91 ◽  
Author(s):  
Onur Bilgen ◽  
Carlos De Marqui ◽  
Kevin B. Kochersberger ◽  
Daniel J. Inman
Keyword(s):  
Flow Control ◽  
Fiber Composite ◽  
Macro Fiber Composite

Analysis of Wrinkled Membranes Bounded With Macro-Fiber Composite (MFC) Actuators

2010 ◽  
Author(s):  
Alireza Doosthoseini ◽  
Armaghan Salehian ◽  
Matthew Daly
Keyword(s):  
Finite Element ◽  
Fiber Composite ◽  
The Other ◽  
Horizontal Direction ◽  
Finite Element Code ◽  
Rectangular Shape ◽  
Macro Fiber Composite

In this paper we focus on a study which involves quantifying the effects of Macro Fiber Composite (MFC) actuators on the pattern and magnitude of wrinkles in a membrane when exposed to various loadings. An ABAQUS finite element code is employed for this research. The membrane in this study has a rectangular shape which is clamped at one edge and is free to move in the horizontal direction at the other edge. MFC actuators are bounded to the membrane to make a bimorph configuration.

scholarly journals An Efficient Damage Quantification Method for Cylindrical Structures Enhanced by a Dry-Point-Contact Torsional-Wave Transducer

2022 ◽  
Vol 12 (2) ◽  
pp. 572
Author(s):  
Shengbo Shan ◽  
Yongdong Pan ◽  
Shengyu Xiao
Keyword(s):  
Point Contact ◽  
Low Frequency ◽  
Wave Interaction ◽  
Torsional Wave ◽  
Wave Reflections ◽  
Cylindrical Structures ◽  
Quantification Method ◽  
Damage Quantification ◽  
Torsional Waves ◽  
Theoretical Analyses

Quantification of damage sizes in cylindrical structures such as pipes and rods is of paramount importance in various industries. This work proposes an efficient damage quantification method by using a dry-point-contact (DPC) transducer based on the non-dispersive torsional waves in the low-frequency range. Theoretical analyses are first carried out to investigate the torsional wave interaction with different sizes of defects in cylindrical structures. A damage quantification algorithm is designed based on the wave reflections from the defect and end. Capitalizing on multiple excitations at different frequencies, the proposed algorithm constructs a damage image that identifies the geometric parameters of the defects. Numerical simulations are conducted to validate the characteristics of the theoretically-predicted wave-damage interaction analyses as well as the feasibility of the designed damage quantification method. Using the DPC transducer, experiments are efficiently carried out with a simple physical system. The captured responses are first assessed to confirm the capability of the DPC transducer for generating and sensing torsional waves. The sizes of the defects in two representative steel rods are then quantified with the proposed method. Both numerical and experimental results demonstrate the efficacy of the proposed damage quantification method. The understandings of the wave-damage interaction and the concept of the damage quantification algorithm lay out the foundation for engineering applications.

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