Design development of (Ba1-xCax)(Ti1-ySny)O3 lead-free piezo ceramic by two manufacturing methods of CSS and SPS, promising for delamination damage detection

1986 ◽

Vol 200 (2) ◽

pp. 135-147 ◽

Cited By ~ 1

Author(s):

M W J Etwell

Keyword(s):

Type Structure ◽

Electrical Engineer ◽

Design Development ◽

Electric Locomotive ◽

Design Features ◽

Main Design ◽

Modern Manufacturing ◽

Manufacturing Methods

This paper outlines the basic development background of the Class 58 locomotive and main design features, with areas of design development resulting from the introduction into service in 1983–85 of the first build of thirty-five locomotives and detail changes in design being applied to the second batch of fifteen locomotives authorized in 1984. This locomotive design developed from a joint exercise between British Rail Engineering Limited (BREL) and the then Chief Mechanical and Electrical Engineer (CM and EE), British Railways Board (BRB) in 1977 which resulted in BREL fully participating in the design development to utilize modern manufacturing methods. The Class 58 was designed by BR specifically for freight duties and is based on a strength underframe with bonnet-type structure and equipment in modular assemblies.

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Delamination damage detection of laminated composite beams using air-coupled ultrasonic transducers

Science China Physics Mechanics and Astronomy ◽

10.1007/s11433-013-5092-7 ◽

2013 ◽

Vol 56 (7) ◽

pp. 1269-1279 ◽

Cited By ~ 21

Author(s):

ZengHua Liu ◽

HongTao Yu ◽

CunFu He ◽

Bin Wu

Keyword(s):

Damage Detection ◽

Laminated Composite ◽

Composite Beams ◽

Ultrasonic Transducers ◽

Laminated Composite Beams ◽

Delamination Damage

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Nonlinear Ultrasonic Detection Method for Delamination Damage of Lined Anti-Corrosion Pipes Using PZT Transducers

Applied Sciences ◽

10.3390/app8112240 ◽

2018 ◽

Vol 8 (11) ◽

pp. 2240 ◽

Cited By ~ 15

Author(s):

Xiaobin Hong ◽

Yuan Liu ◽

Xiaohui Lin ◽

Zongqiang Luo ◽

Zhenwei He

Keyword(s):

Damage Detection ◽

Detection Method ◽

Wavelet Packet ◽

Nonlinear Coefficient ◽

Wavelet Packet Transform ◽

Third Order ◽

Ultrasonic Detection ◽

Hilbert Huang Transform ◽

Nonlinear Ultrasonic ◽

Delamination Damage

Lined anti-corrosion pipes are widely used in oil and gas, petrochemical, pharmaceutical industries. However, defects, especially delamination, may occur in the production and service of pipes which result in safety accidents. Based on nonlinear ultrasonic theory, this paper studied the delamination detection method using the nonlinear harmonics for lined anti-corrosion pipes. The response characteristics of the anti-corrosion pipe were obtained through a sweep sine response experiment and the preferred excitation frequency was determined. The Wavelet Packet transform and Hilbert–Huang transform is applied for signal process and feature extraction. Then, a series of experiments were carried out and the results were analyzed and discussed. The results showed that a second-order and third-order nonlinear coefficient increased with the delamination damage. The amplitude of second-harmonic is much stronger than the third-order one. The mean squared error of the nonlinear coefficient, which was processed by Wavelet Packet transform and Hilbert–Huang transform, is smaller than wavelet packet transform and Discrete Fourier transform or processed only Hilbert–Huang transform. The higher harmonics can describe the change of delamination damage, which means that the nonlinear ultrasonic detection method could use for damage detection of anti-corrosion pipe. The nonlinear higher-harmonic is sensitive to delamination damage. The nonlinear ultrasonic method has the potential for damage detection for lined anti-corrosion pipes.

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Damage Identification Using Lamb Waves

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.452-453.29 ◽

2010 ◽

Vol 452-453 ◽

pp. 29-32 ◽

Cited By ~ 6

Author(s):

Z. Sharif-Khodaei ◽

M.H. Aliabadi

Keyword(s):

Damage Detection ◽

Damage Identification ◽

Lamb Waves ◽

Piezoelectric Materials ◽

Smart Structures ◽

Composite Panels ◽

Sensors And Actuators ◽

Maintenance Activity ◽

Delamination Damage

The concept of damage detection using sensors in composite panels is of growing interest, due to the reduction in maintenance activity and increasing of the aircraft safety. Piezoelectric materials have been widely used to build a variety of transducers for activating and receiving Lamb waves which are used for delamination/damage detection. The aim of this paper is to use smart structures for detecting and locating damage in composite panels, by using piezoelectric patches as both sensors and actuators.

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Detection of Delamination Damage in a Composite Laminate Beam Utilising the Principle of Strain Compatibility

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.417-418.269 ◽

2009 ◽

Vol 417-418 ◽

pp. 269-272 ◽

Cited By ~ 3

Author(s):

Stuart Wildy ◽

Benjamin Cazzolato ◽

Andrei G. Kotousov

Keyword(s):

Experimental Investigation ◽

Damage Detection ◽

Structural Damage ◽

Future Research ◽

Laser Vibrometer ◽

Beam Structures ◽

Strain Compatibility ◽

Detection Techniques ◽

Monitoring Technologies ◽

Delamination Damage

This paper presents an experimental investigation of a new method for damage detection based on the most fundamental concept in continuum mechanics: strain compatibility. Compliance with this principle implies a deformed material is free from discontinuities, which are indicative of many types of structural damage. Therefore the principle of strain compatibility, in its ability to identify discontinuities, is very promising as a new foundation for future research into non-destructive evaluation and structural health monitoring technologies. The proposed method has many advantages compared to existing damage detection techniques, such as its invariance to material properties, type and intensity of loading, and the geometry of the structure. In this paper, a proposed formulation of the strain compatibility equation for beam structures, which is invariant to loading intensity, is presented. An experimental investigation of the proposed algorithm was conducted on a delaminated cantilever beam, utilising a PSV-3D scanning laser vibrometer. The experiment demonstrated that the strain compatibility technique can accurately locate delamination damage in composite beam structures.

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Damage Detection in Composite Structures With Wavenumber Array Data Processing

Volume 2: Mechanics and Behavior of Active Materials; Structural Health Monitoring; Bioinspired Smart Materials and Systems; Energy Harvesting ◽

10.1115/smasis2013-3288 ◽

2013 ◽

Author(s):

Zhenhua Tian ◽

Cara Leckey ◽

Lingyu Yu

Keyword(s):

Wave Propagation ◽

Data Processing ◽

Damage Detection ◽

Composite Structures ◽

Crack Detection ◽

Guided Wave ◽

Ultrasonic Waves ◽

Array Data ◽

Isotropic Materials ◽

Delamination Damage

Guided ultrasonic waves (GUW) have the potential to be an efficient and cost-effective method for rapid damage detection and quantification of large structures. Attractive features include sensitivity to a variety of damage types and the capability of traveling relatively long distances. They have proven to be an efficient approach for crack detection and localization in isotropic materials. However, techniques must be pushed beyond isotropic materials in order to be valid for composite aircraft components. This paper presents our study on GUW propagation and interaction with delamination damage in composite structures using wavenumber array data processing, together with advanced wave propagation simulations. Parallel elastodynamic finite integration technique (EFIT) is used for the example simulations. Multi-dimensional Fourier transform is used to convert time-space wavefield data into frequency-wavenumber domain. Wave propagation in the wavenumber-frequency domain shows clear distinction among the guided wave modes that are present. This allows for extracting a guided wave mode through filtering and reconstruction techniques. Presence of delamination causes spectral change accordingly. Results from 3D CFRP guided wave simulations with delamination damage in flat-plate specimens are used for wave interaction with structural defect study.

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