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ULTRASONIC INFLUENCE OF POROSITY LEVEL ON CFRP COMPOSITE LAMINATES USING RAYLEIGH PROBE WAVES

Acta Mechanica Solida Sinica 2008年第4期21卷 298-307页

作者： Je-Woong Park Do-Jung Kim Kwang-Hee Im Sang-Kyu Park David K.Hsu Adam H.Kite Sun-Kyu Kim Kil-Sung Lee In-Young Yang Dept.of Naval Architecture and Ocean Eng. Chosun UniversityKwangju 501-759Korea Dept.of Automotive Eng. Woosuk UniversitySamrae-upWanju-kunChonbuk565-701Korea Center for Nondestructive Evaluation Iowa State UniversityAmesIowa 50011USA Division of Precision Mec.Eng. Chonbuk National UniversityJeonju 561-756Korea School of Mechanical Engineering Chosun UniversityKwangju 501-759Korea

It was found that a pitch-catch signal was more sensitive than normal incidence backwall echo of longitudinal wave to subtle flaw conditions in the composites （damages, fiber orientation, low level porosity, ply waviness, and cracks）. Both the strength and stiffness depend on the fiber orientation and porosity volume in the composites. The porosity content of a composite structure is critical to the strength and performance of the structure in general. The depth of the sampling volume where the pitch-catch signal came from was relatively shallow with the head- to-head miniature Rayleigh probes, but the depth can be increased by increasing the separation distance of the transmitting and receiving probes. Also, a method was utilized to determine the porosity content of a composite lay-up by processing micrograph images of the laminate. A free software package was utilized to process micrograph images of the test sample. The results from the image processing method were compared with existing data. Beam profile was characterized in unidirectional CFRP（carbon fiber reinforced plastics） using pitch-catch Rayleigh probes and the one-sided pitch-catch technique was utilized to produce C-scan images with the aid of the automatic scanner.

关键词： ply-layup orientation unidirectional CFRP beam profile pitch-catch contact mode,porosity level

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Ultrasonic Influence of Porosity Level on CFRP Composite Laminates Using Rayleigh Probe Waves

Ultrasonic Influence of Porosity Level on CFRP Composite Lam...

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The Eighth International Conference on Fundamentals of Fracture（ICFF VIII）

作者： Je-Woong Park Do-Jung Kim Kwang-Hee Im David K.Hsu Sun-Kyu Kim Kil-Sung Lee In-Young Yang Dept.of Naval Architecture and Ocean Eng. Chosun UniversityKwangju 501-759Korea Department of Automotive Eng. Woosuk UniversitySamrae-upWanju-kunChonbuk565-701Korea Center for Nondestructive Evaluation Iowa State UniversityAmesIowa 50011USA

It is found that a pitch-catch signal was more sensitive than normal incidence backwall echo of longitudinal wave to subtle flaw conditions in the composites(damages,fiber orientation,low level porosity,ply waviness,and cracks).The depth of the sampling volume where the pitch-catch signal came from was relatively shallow with the head-to-head miniature Rayleigh probes,but the depth can be increased by increasing the separation distance of the transmitting and

关键词： ply-layup orientation CFRP Peak-delay Measurement Method Contact Mode Porosity Level

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