| ULTRASONIC INFLUENCE OF POROSITY LEVEL ON CFRP COMPOSITE LAMINATES USING RAYLEIGH PROBE WAVES |
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| 作者单位： | Dept.of Naval Architecture and Ocean Eng.，Chosun University，Kwangju 501-759，Korea，Dept.of Automotive Eng.，Woosuk University，Samrae-up，Wanju-kun，Chonbuk，565-701，Korea，Center for Nondestructive Evaluation，Iowa State University，Ames，Iowa 50011，USA，Division of Precision Mec.Eng.，Chonbuk National University，Jeonju 561-756，Korea，School of Mechanical Engineering，Chosun University，Kwangju 501-759，Korea |
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| 基金项目： | Acknowledgement This work was supported by Chosun University, Gwangju, Korea, during the 2007 academic year. |
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| 摘 要： | 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.
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| 关 键 词： | 层间定向 CFRP 束梁剖面图 接触造型 |
| 收稿时间： | 24 June 2008 |
ULTRASONIC INFLUENCE OF POROSITY LEVEL ON CFRP COMPOSITE LAMINATES USING RAYLEIGH PROBE WAVES |
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| Authors: | Je-Woong Park Do-Jung Kim Kwang-Hee Im Sang-Kyu Park David KHsu Adam HKite Sun-Kyu Kim Kil-Sung Lee In-Young Yang |
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| Institution: | [1]Dept. of Naval Architecture and Ocean Eng., Chosun University, Kwangju 501-759, Korea [2]Dept. of Automotive Eng., Woosuk University, Samrae-up, Wanju-kun, Chonbuk, 565-701, Korea [3]Center for Nondestructive Evaluation, Iowa State University, Ames, Iowa 50011, USA [4]Division of Precision Mec. Eng., Chonbuk National University, Jeonju 561-756, Korea [5]School of Mechanical Engineering, Chosun University, Kwangju 501-759, Korea |
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| Abstract: | 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. |
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| Keywords: | ply-layup orientation unidirectional CFRP beam profile pitch-catch contact mode porosity level |
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