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Xiaochuan Jiang, Jun Wang, Ying Zhang and Shenxue Jiang
This paper reports on investigations of the air-coupled ultrasonic (ACU) method to detect common defects in solid timber panels made of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.). The ACU technology is a non-contact method for nondestructive tim...
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Arno Duijster, Arno Volker, Frenk Van den Berg and Carola Celada-Casero
The applicability of laser ultrasonics for the determination of grain size and phase composition in steels under different temperatures was investigated. This was done by obtaining the velocity and attenuation of propagating ultrasonic waves in a simulat...
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Chaolei Chen, Huaishu Hou, Mingxu Su, Shiwei Zhang, Chaofei Jiao and Zhifan Zhao
To conduct the ultrasonic weld inspection of polyethylene pipes, it is necessary to use low-frequency transducers due to the high sound energy attenuation of polyethylene. However, one of the challenges in this process is that the blind zone of the ultra...
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Kanji Ono
Ultrasonic attenuation coefficients of ceramic and inorganic materials were determined for the longitudinal and transverse wave modes. Sample materials included hard and soft ceramics, common ceramics, ceramic-matrix composites, mortars, silicate glasses...
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Alina Karki and Junru Wu
The relationship between ultrasonic parameters (attenuation coefficients and velocity) and bone porosity in bovine cancellous bone is explored to understand the possibility of fracture risk diagnosis associated with osteoporosis by applying ultrasound. I...
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Kanji Ono
This work determined the attenuation coefficients of Lamb waves of ten engineering materials and compared the results with calculated Lamb-wave attenuation coefficients, a?S and a?A. The Disperse program and a parametric method based on Disperse results ...
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Linsen Zhan, Biao Liu, Yi Zhang and Hailong Lu
Gas hydrates (GH) are well known to have an influential effect on the velocity and attenuation of gas hydrate-bearing sediments (GHBS). Based on rock physics modeling, sediment velocity has been extensively used to characterize the distribution of gas hy...
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Zhiqiang Han, Sookhyun Jeong, Jae-Won Jang, Jong Hun Woo and Daekyun Oh
Glass fiber-reinforced polymer (GFRP) ship structures have hull plate thicknesses of 10 mm or more and are fabricated using a higher proportion of resin matrix systems than E-glass fiber reinforcements. Therefore, GFRP is classified as a highly attenuati...
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Jea Seang Lim, Tae Sung Park, Yu Min Choi and Ik Keun Park
Composite materials have attracted significant attention with regard to the manufacturing of structures that require weight reduction, such as automobiles and aircraft, because they are more resistant to corrosion and fatigue than conventional metal mate...
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Hani Alhazmi and Rasim Guldiken
The propagation of surface acoustic waves over a solid plate is highly influenced by the presence of liquid media on the surface. At the solid?liquid interface, a leaky Rayleigh wave radiates energy into the liquid, causing a signification attenuation of...
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