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Ndt & E International
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Papers 3935
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#1Lin Li (DUT: Dalian University of Technology)H-Index: 1
#2Zhang Wei (DUT: Dalian University of Technology)
Last.Mingkai Lei (DUT: Dalian University of Technology)H-Index: 3
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Abstract Ultrasonic nondestructive characterization of multi-phase heterogeneous coatings is challenging due to the complex elastic spatial distribution. In this paper, a two-dimensional Random Multi-phase Medium Model (RMMM) for heterogeneous coatings containing solid-solid-gas three phases is developed, which is able to simulate the elastic spatial distribution of coatings by taking into account material microstructure. This model is then applied to correlate ultrasonic wave velocity and atten...
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#1Weibin Li (Ha Tai: Xiamen University)H-Index: 1
#2Chang Jiang (Ha Tai: Xiamen University)
Last.Mingxi Deng (Chongqing University)
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Abstract Low efficiency of energy transition is generally considered to be the only weakness of electromagnetic ultrasonic transducers (EMATs). Electromagnetic acoustic resonance (EMAR) technique has been successfully used to overcome this disadvantage with a combination of the EMATs with the ultrasonic resonant method. In this paper, a nonlinear EMAR technique has been proposed to evaluate the thermal damage of metallic materials, which combines the feature of EMAR with the merit of higher harm...
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#1Alan C. Kubrusly (PUC-Rio: Pontifical Catholic University of Rio de Janeiro)H-Index: 4
#2Jean Pierre von der Weid (PUC-Rio: Pontifical Catholic University of Rio de Janeiro)H-Index: 20
Last.Steve Dixon (Warw.: University of Warwick)H-Index: 26
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Abstract The interaction of the SH0, SH1, SH2 and SH3 guided wave modes on a metal plate with a thickness discontinuity is numerically and experimentally investigated. Two different geometries were evaluated, namely symmetric and non-symmetric discontinuities, relative to the plate longitudinal mid-plane. Experiments were performed with periodic permanent magnet array EMATs as transmitters and receivers. Mode separation in transmission and reception was experimentally and numerically performed b...
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#1Xiaosong Du (Iowa State University)H-Index: 3
#2Leifur Leifsson (Iowa State University)H-Index: 15
Abstract This work introduces multifidelity metamodeling for reliability analysis of nondestructive testing (NDT) systems. Specifically, the Cokriging metamodel is utilized to accelerate the uncertainty propagation within model-assisted probability of detection (MAPOD) analysis of ultrasonic testing (UT) systems. The Cokriging multifidelity metamodel fuses a limited amount of data obtained from high-fidelity (HF) physics-based UT models, which are accurate but time-consuming to evaluate, with a ...
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#1Yuanhang Chen (HIT: Harbin Institute of Technology)
#2Bo Chen (HIT: Harbin Institute of Technology)H-Index: 8
Last.Jicai Feng (HIT: Harbin Institute of Technology)H-Index: 30
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Abstract Diverse welding processes have been utilized in manufacturing industry for years. But up to date, welding quality still cannot be guaranteed, due to the lack of an efficient and on-line welding defects monitoring method, and this leads to increased manufacturing costs. In this paper, a method based on feature extraction and machine learning algorithm for on-line quality monitoring and defects classification was presented. Plasma radiation was captured by an optical fiber probe, and deli...
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#1Qin Luo (University of Electronic Science and Technology of China)
#2Bin Gao (University of Electronic Science and Technology of China)H-Index: 21
Last.Yang YangH-Index: 5
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Abstract Most common types of defects for composite are debond and delamination. It is difficult to detect the inner defects on a complex shaped specimen by using conventional optical thermography nondestructive testing (NDT) methods. In this paper, a hybrid of spatial and temporal deep learning architecture for automatic thermography defects detection is proposed. The integration of cross network learning strategy has the capability to significantly minimize the uneven illumination and enhance ...
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#1Chih-Peng Yu (NCHU: National Chung Hsing University)
Abstract Non-destructive testing (NDT) techniques with impact-type excitations are often used to assess the dimension data of buried piles because such methods are generally simple in theory and relatively cost-efficient. For the evaluation of pile lengths, the feasibility of an approach relies on whether the influence due to reflected signals from the pile ends can be effectively detected and quantified. Both wave propagation theories associated with the axial and flexural waves of a slender me...
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#1Yoshikazu Ohara (Tohoku University)H-Index: 14
#2Hiromichi Nakajima (Tohoku University)H-Index: 1
Last.Tsuyoshi Mihara (Tohoku University)H-Index: 13
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Abstract To achieve higher signal-to-noise ratios (SNRs) in imaging closed cracks in the vicinity of a surface, we propose a nonlinear surface-acoustic-wave phased array imaging method based on the fixed-voltage fundamental wave amplitude difference, which enables the inference of all the nonlinear components generated at cracks based on the energy movement between the fundamental and nonlinear components. After confirming its fundamental performance with a slit specimen, we applied it to two ki...
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#1Chia-Chia Chang (NCHU: National Chung Hsing University)
#2Chih-Peng Yu (NCHU: National Chung Hsing University)
Last.Yiching Lin (NCHU: National Chung Hsing University)H-Index: 12
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Abstract In an Impact-Echo (IE) test, the Fast Fourier transform (FFT) of the impacted surface responses reveals frequency peaks of major periodical events and can be used to determine depth information, such as the thickness of a target specimen and the depth of a delaminated crack. Since rebar interfaces also result in comparable spectral frequencies but with different depth characteristics, IE testers might have difficulty to determine whether a certain peak frequency is associated with a cra...
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#1Song DingH-Index: 1
#2Gui Yun Tian (Newcastle University)H-Index: 44
Last.Ruslee Sutthaweekul (Newcastle University)H-Index: 2
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Abstract Different features of Magnetic Barkhausen Noise (MBN) represent distinctive characteristics of material stress states, microstructures and domain wall (DW) behaviors. However, a group of features could be selected and fused for the evaluation of specific characters such as hardness and stress. This paper analyzes multiple features of MBN and their reflections on different material and health status influences and proposes a new feature selection and fusion method for hardness evaluation...
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Optics
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Electronic engineering
Nondestructive testing
Ultrasonic sensor