51227 Investigation of fracture processes in composites using X-ray computed tomography and acoustic emission method

1994 ◽  
Vol 27 (2) ◽  
pp. 106
Author(s):  
K. Hayashi ◽  
Y. Nagata ◽  
H. Yamaji ◽  
T. Ishida
Keyword(s):  
Computed Tomography ◽  
Acoustic Emission ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
X Ray ◽  
X Ray Computed ◽  
Fracture Processes

Use of acoustic emission and X-ray computed tomography for damage evaluation of freeze-thawed concrete

2010 ◽  
Vol 24 (12) ◽  
pp. 2347-2352 ◽  
Author(s):  
Tetsuya Suzuki ◽  
Hidehiko Ogata ◽  
Ryuichi Takada ◽  
Masao Aoki ◽  
Masayasu Ohtsu
Keyword(s):  
Computed Tomography ◽  
Acoustic Emission ◽  
Damage Evaluation ◽  
X Ray ◽  
X Ray Computed

scholarly journals Методи діагностування дефектів деталей авіаційних двигунів з композиційних матеріалів

2021 ◽  
pp. 102-109
Author(s):  
Володимир Олександрович Пальчиковський ◽  
Андрій Володимирович Морозов ◽  
Юрій Іванович Торба
Keyword(s):  
Acoustic Emission ◽  
Composite Materials ◽  
Defect Detection ◽  
Static Load ◽  
Thermal Testing ◽  
Local Defect ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Engine Operation ◽  
X Ray

The key priority in improving the technical and economic performance of gas turbine engines lays in the use of new composite materials. The use of composites in the components of critical load-carrying structures operating under static and dynamic loads during long service lives determines the need to predict the component lives. Also, in order to increase the safety of engine operation and improve the parts manufacturing process, timely defect detection in such structures is of great importance. This article is devoted to the detection of the composite parts defects and damages that occur at different stages of manufacturing and operation. The aim is to investigate the existing methods of non-destructive testing of composite materials, describe their functional concept, and determine the field of their application. The article considers acoustic, thermal, optical, and radiation testing methods. Among the acoustic methods, the phased array method is selected as the most informative and multipurpose. The acoustic emission method is also selected; it will allow real-time monitoring of defect growth during testing. Out of thermal methods, the vibrothermography method was selected as the most advanced among the thermographic sub-methods. It allows using the phenomenon of local defect resonance and thus ensures effective defect detection. Shearography is selected for investigation out of optical methods. The special aspects of the use of X-ray methods are considered through the example of X-ray computed tomography. It is concluded that the approach combining several methods can significantly increase the efficiency of defect detecting and help to assess their criticality. Active thermal testing is well suited for fast scanning of large-sized parts and searching for areas of defect accumulation. In the following, local methods, such as impedance, vibrothermography, or one of the ultrasonic, should be used. To measure deformations under static load, it is a good practice to use shearography. To identify progressive defects under static load, it makes sense to use the acoustic emission method.

scholarly journals A Comparative Study of Localized Corrosion and Stress Corrosion Cracking of 13Cr Martensitic Stainless Steel Using Acoustic Emission and X-ray Computed Tomography

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2569 ◽  
Author(s):  
Kaige Wu ◽  
Kaita Ito ◽  
Ippei Shinozaki ◽  
Pornthep Chivavibul ◽  
Manabu Enoki
Keyword(s):  
Computed Tomography ◽  
Stainless Steel ◽  
Acoustic Emission ◽  
Stress Corrosion ◽  
Martensitic Stainless Steel ◽  
Localized Corrosion ◽  
X Ray ◽  
X Ray Computed ◽  
Ae Signals

An accurate evaluation of stress corrosion cracking (SCC) in 13Cr martensitic stainless steel (MSS) is still missing due to the lack of an in-situ insight into the process evolution and full characterization of the corrosion morphology. In this work, two main regimes involved in the SCC progression, including localized corrosion and cracking, were comparatively studied using in-situ acoustic emission (AE) monitoring and three-dimensional (3D) X-ray computed tomography (XCT) scanning. The stress corrosion tests were conducted with u-bent smooth specimens subjected to a single droplet of 1 μL 1% neutral NaCl solution. Localized corrosion and cracking evolution were controlled in tempered and quenched steel specimens, respectively. From XCT scanning, localized corrosion was featured by an irregular corrosion pit with deposited corrosion products containing cracks. The single dominant SCC crack was observed to initiate from corrosion pit and propagate with a 3D tortuous and discontinuous morphology. AE signals were detected in both cases. Correlated with in-situ observations and clustering analysis, source identification of AE signals was proposed. AE signals during localized corrosion were assessed to be mainly from cracking within the deposited corrosion products. Comparatively, hydrogen-bubble evolution, plastic deformation, and crack-branches coalescence were proposed as the AE sources of cracking evolution.

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