The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Wei Zhao - One of the best experts on this subject based on the ideXlab platform.
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a new differential eddy current testing sensor used for detecting Crack Extension direction
Ndt & E International, 2011Co-Authors: Peng Xu, Songling Huang, Wei ZhaoAbstract:In this paper a new differential eddy current testing sensor is proposed which is composed of two planar circumferential gradient winding spiral coils. The eddy current testing sensor can detect out the existence of Crack in conductive material surface and furthermore the Crack Extension direction because of the circumferential gradient winding spiral structure of coil. We study the detection principle of Crack Extension direction and carry out experimental test. The test results show that the impedance of circumferential gradient winding coil mainly varies with Crack Extension direction and width. Based on impedance plane analysis we extract the features which can indicate the Crack characteristics and study on the inverse quantitative evaluation of Crack Extension direction and Crack width.
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A new differential eddy current testing sensor used for detecting Crack Extension direction
NDT and E International, 2011Co-Authors: Peng Xu, Songling Huang, Wei ZhaoAbstract:In this paper a new differential eddy current testing sensor is proposed which is composed of two planar circumferential gradient winding spiral coils. The eddy current testing sensor can detect out the existence of Crack in conductive material surface and furthermore the Crack Extension direction because of the circumferential gradient winding spiral structure of coil. We study the detection principle of Crack Extension direction and carry out experimental test. The test results show that the impedance of circumferential gradient winding coil mainly varies with Crack Extension direction and width. Based on impedance plane analysis we extract the features which can indicate the Crack characteristics and study on the inverse quantitative evaluation of Crack Extension direction and Crack width. © 2011 Elsevier Ltd. All rights reserved.
Peng Xu - One of the best experts on this subject based on the ideXlab platform.
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a new differential eddy current testing sensor used for detecting Crack Extension direction
Ndt & E International, 2011Co-Authors: Peng Xu, Songling Huang, Wei ZhaoAbstract:In this paper a new differential eddy current testing sensor is proposed which is composed of two planar circumferential gradient winding spiral coils. The eddy current testing sensor can detect out the existence of Crack in conductive material surface and furthermore the Crack Extension direction because of the circumferential gradient winding spiral structure of coil. We study the detection principle of Crack Extension direction and carry out experimental test. The test results show that the impedance of circumferential gradient winding coil mainly varies with Crack Extension direction and width. Based on impedance plane analysis we extract the features which can indicate the Crack characteristics and study on the inverse quantitative evaluation of Crack Extension direction and Crack width.
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A new differential eddy current testing sensor used for detecting Crack Extension direction
NDT and E International, 2011Co-Authors: Peng Xu, Songling Huang, Wei ZhaoAbstract:In this paper a new differential eddy current testing sensor is proposed which is composed of two planar circumferential gradient winding spiral coils. The eddy current testing sensor can detect out the existence of Crack in conductive material surface and furthermore the Crack Extension direction because of the circumferential gradient winding spiral structure of coil. We study the detection principle of Crack Extension direction and carry out experimental test. The test results show that the impedance of circumferential gradient winding coil mainly varies with Crack Extension direction and width. Based on impedance plane analysis we extract the features which can indicate the Crack characteristics and study on the inverse quantitative evaluation of Crack Extension direction and Crack width. © 2011 Elsevier Ltd. All rights reserved.
Songling Huang - One of the best experts on this subject based on the ideXlab platform.
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a new differential eddy current testing sensor used for detecting Crack Extension direction
Ndt & E International, 2011Co-Authors: Peng Xu, Songling Huang, Wei ZhaoAbstract:In this paper a new differential eddy current testing sensor is proposed which is composed of two planar circumferential gradient winding spiral coils. The eddy current testing sensor can detect out the existence of Crack in conductive material surface and furthermore the Crack Extension direction because of the circumferential gradient winding spiral structure of coil. We study the detection principle of Crack Extension direction and carry out experimental test. The test results show that the impedance of circumferential gradient winding coil mainly varies with Crack Extension direction and width. Based on impedance plane analysis we extract the features which can indicate the Crack characteristics and study on the inverse quantitative evaluation of Crack Extension direction and Crack width.
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A new differential eddy current testing sensor used for detecting Crack Extension direction
NDT and E International, 2011Co-Authors: Peng Xu, Songling Huang, Wei ZhaoAbstract:In this paper a new differential eddy current testing sensor is proposed which is composed of two planar circumferential gradient winding spiral coils. The eddy current testing sensor can detect out the existence of Crack in conductive material surface and furthermore the Crack Extension direction because of the circumferential gradient winding spiral structure of coil. We study the detection principle of Crack Extension direction and carry out experimental test. The test results show that the impedance of circumferential gradient winding coil mainly varies with Crack Extension direction and width. Based on impedance plane analysis we extract the features which can indicate the Crack characteristics and study on the inverse quantitative evaluation of Crack Extension direction and Crack width. © 2011 Elsevier Ltd. All rights reserved.
Taketoshi Nojima - One of the best experts on this subject based on the ideXlab platform.
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Pseudo Stable Phenomenon of Crack Extension in Three Point Bending Test for Soda-Lime Glass.
Journal of The Society of Materials Science Japan, 1996Co-Authors: Hidetoshi Kobayashi, Masashi Daimaruya, Taketoshi NojimaAbstract:Recently, a concept of pseudo stable phenomenon (PSP) was proposed by theoretical considerations.The PSP is a phenomenon that Crack Extension occurs before the load reaches the maximum, Pmax, and it appears in conventional fracture toughness tests for Crack-rate sensitive, perfectly brittle materials. The Crack Extension due to PSP depends on the initial Crack length, a0, the testing machine compliance, Λ*, and the Crack-rate sensitivity, m*, of Crack resistance force. In the theoretical considerations, a method of numerical simulation was proposed by Nojima and Nakai.In the present paper, a series of three point bending tests was carried out on soda-lime glass to examine the PSP experimentally. For the tests, a testing equipment with large machine compliance and specimens with different initial Crack lengths were used. The experimental data were compared with the results of numerical simulation. It was found by both experiments and numerical simulations that the amount of Crack Extension due to PSP becomes maximum when x0≈0.16 (x0=a0/W, W: specimen width) and that the fracture toughness obtained from Pmax, and x0 is always understimated.
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Stable Crack Extension of an Alumina Ceramic in Three Point Bending Test.
Journal of The Society of Materials Science Japan, 1993Co-Authors: Taketoshi Nojima, Osamu NakaiAbstract:Fracture toughness values of engineering ceramics are often obtained by conventional three point bending tests. In these tests, an initial Crack usually extends unstably, and therefore it is quite difficult and also labourious to determine R-curves on ceramics. In order to perform stable Crack Extension tests, the stable condition for the Crack Extension was studied in three point bending tests. The stable condition was depicted on EBΛ*-x diagram (E; Youngs modulus of the specimen, B; the thickness of the specimen, Λ*; the compliance of the testing machine and x; the non-dimensional Crack length). The diagram shows that the stable Crack Extension test can be performed when the value of EBΛ* is small.On the basis of the study, a Crack stabilizer was newly designed to achieve the small value of EBΛ*. By using the stabilizer, the stable Crack Extension tests were successfully performed in an alumina ceramic.
Osamu Nakai - One of the best experts on this subject based on the ideXlab platform.
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Stable Crack Extension of an Alumina Ceramic in Three Point Bending Test.
Journal of The Society of Materials Science Japan, 1993Co-Authors: Taketoshi Nojima, Osamu NakaiAbstract:Fracture toughness values of engineering ceramics are often obtained by conventional three point bending tests. In these tests, an initial Crack usually extends unstably, and therefore it is quite difficult and also labourious to determine R-curves on ceramics. In order to perform stable Crack Extension tests, the stable condition for the Crack Extension was studied in three point bending tests. The stable condition was depicted on EBΛ*-x diagram (E; Youngs modulus of the specimen, B; the thickness of the specimen, Λ*; the compliance of the testing machine and x; the non-dimensional Crack length). The diagram shows that the stable Crack Extension test can be performed when the value of EBΛ* is small.On the basis of the study, a Crack stabilizer was newly designed to achieve the small value of EBΛ*. By using the stabilizer, the stable Crack Extension tests were successfully performed in an alumina ceramic.
