Online monitoring of delamination mechanisms in drilling of Mwcnts reinforced Gfrp nanocomposites by acoustic emission

2018 ◽  
Vol 5 (5) ◽  
pp. 13036-13047
Author(s):  
P. Kishore Kumar ◽  
P. Kuppan
Keyword(s):  
Acoustic Emission ◽  
Online Monitoring

scholarly journals Preliminary Development of Online Monitoring Acoustic Emission System for the Integrity of Research Reactor Components

2018 ◽  
Vol 962 ◽  
pp. 012064
Author(s):  
S Bakhri ◽  
E Sumarno ◽  
R Himawan ◽  
T Y Akbar ◽  
M. Subekti ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Research Reactor ◽  
Online Monitoring ◽  
Emission System

scholarly journals High-Speed Edge Trimming of CFRP and Online Monitoring of Performance of Router Tools Using Acoustic Emission

Materials ◽  
2016 ◽  
Vol 9 (10) ◽  
pp. 798 ◽  
Author(s):  
Rangasamy Prakash ◽  
Vijayan Krishnaraj ◽  
Redouane Zitoune ◽  
Jamal Sheikh-Ahmad
Keyword(s):  
Acoustic Emission ◽  
High Speed ◽  
Online Monitoring ◽  
Edge Trimming

Analysis of Emerging NDE Techniques: Methods for Evaluating and Implementing Continuous Online Monitoring

2009 ◽  
Author(s):  
Stephen E. Cumblidge ◽  
Steven R. Doctor ◽  
Leonard J. Bond ◽  
Tom T. Taylor ◽  
Timothy R. Lupold ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Online Monitoring ◽  
The United States ◽  
Corrosion Cracking ◽  
Review Section ◽  
The Past ◽  
Proactive Management ◽  
License Renewal

There are approximately 440 operating reactors in the global nuclear power plant (NPP) fleet with an average age greater than 20 years and original design lives of 30 or 40 years. The United States is currently implementing license extensions of 20 years on many plants, and consideration is now being given to the concept of “life-beyond-60”, license extension from 60 to 80 years and potentially longer. In almost all countries with NPPs, authorities are looking at some form of license renewal program. In support of NPP license renewal over the past decade, various national and international programs have been initiated. One of the goals of the program for the proactive management of materials degradation (PMMD) is to manage proactively the in-service degradation of metallic components in aging NPPs. As some forms of degradation, such as stress corrosion cracking, are characterized by a long initiation time followed by a rapid growth phase, new inspection or monitoring technologies may be required. New nondestructive evaluation (NDE) techniques that may be needed include techniques to find stress corrosion cracking (SCC) precursors, on-line monitoring techniques to detect cracks as they initiate and grow, as well as advances in NDE technologies. This paper reports on the first part of the development of a methodology to determine the effectiveness of these emerging NDE techniques for managing metallic degradation. This methodology will draw from experience derived from evaluating techniques that have “emerged” in the past. The methodology will follow five stages: a definition of inspection parameters, a technical evaluation, laboratory testing, round robin testing, and the design of a performance demonstration program. This methodology will document the path taken for previous techniques and set a standardized course for future NDE techniques. This paper then applies the expert review section of the methodology to the acoustic emission technique to evaluate the use of acoustic emission in performing continuous online monitoring of reactor components.

scholarly journals A Fast Beamforming Method to Localize an Acoustic Emission Source under Unknown Wave Speed

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 735 ◽  
Author(s):  
Junfei Tai ◽  
Tian He ◽  
Qiang Pan ◽  
Dayi Zhang ◽  
Xiaoran Wang
Keyword(s):  
Acoustic Emission ◽  
Large Scale ◽  
Wave Speed ◽  
Online Monitoring ◽  
Propagation Speed ◽  
Emission Source ◽  
Test Results ◽  
Acoustic Emission Source ◽  
Pencil Lead ◽  
Thin Walled

The beamforming method is capable of localizing the acoustic emission source in a large-scale structure but its accuracy relies strongly on the assumed propagation speed and it is quite time consuming to apply in online monitoring. This paper proposes a fast beamforming method to localize an acoustic emission source in a thin-walled structure with unknown wave speed. Firstly, the Bartlett beamforming method (BBM) is introduced into broadband Lamb wave signal processing to develop an L-shape array-based damage source localization method for a thin-walled structure. Secondly, the fast Bartlett beamforming method (FBBM) is proposed based on the characteristics of BBM. Finally, the pencil-lead break test is carried out to validate the proposed method. The test results show that the FBBM can accurately localize the damage source by any given probable wave speed much more rapidly than traditional delay-and-sum beamforming.

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