巻号一覧
38 巻 (2012)
- 6 号 p. 228-
- 5 号 p. 183-
- 4 号 p. 137-
- 3 号 p. 93-
- 2 号 p. 41-
- 1 号 p. 8-
38 巻, 5 号
選択された号の論文の4件中1～4を表示しています
- |<
- <
- 1
- >
- >|
研究論文
-
卜部 啓, 高坪 純治, 遠山 暢之, 津田 浩, 永井 英幹2012 年 38 巻 5 号 p. 183-192
発行日: 2012年
公開日: 2013/09/28
ジャーナル フリーA generation laser scanning method for visualizing ultrasound waves propagating on an object, such as composite structures, as an animation image had been developed. This method makes flaw inspections for objects to be visible, quick and easy to understand. In this research, we investigated to make the method completely contact-free by applying an air-coupled ultrasound transducer as a receiver, instead of a contact PZT transducer, and to apply it to flaw inspections of CFRP by visualizing Lamb wave propagations. First, relationships between signal amplitude and transmitting/receiving angle of air-coupled ultrasound transducers were investigated for CFRP plates with various fiber orientations. Then based on the results, the air-coupled transducer was applied as a receiver in the method, and several visualized images of A0 mode Lamb waves on CFRP with flaws, such as artificial delaminations or lack of fiber, were obtained without a contact of transducer. The flaws were successfully detected in the images. It was also shown that fiber orientation of CFRP affects the generation of Lamb wave by laser, and that single mode of Lamb waves can be visualized by adjusting receiving angle.抄録全体を表示PDF形式でダウンロード (5317K) -
石丸 和宏2012 年 38 巻 5 号 p. 193-199
発行日: 2012年
公開日: 2013/09/28
ジャーナル フリーThe purpose of this research is to investigate the effects of enforcing cover material of transverse isotropy on the dynamic response of the layered hollow cylinders. Based on the two dimensional theory of elasto-dynamics the method of eigenfunction expansions has been used to obtain exact solutions for this problem. Numerical calculations are made for the hollow cylinder composed of isotropic with the covering transverse isotropic material, and stresses variations at transient states of the cylinder are shown graphically. The present results can be applied for a reference to approximate solutions using numerical approaches such as the finite element method.抄録全体を表示PDF形式でダウンロード (1036K) -
平井 研一, 杵淵 紀世志, 紙田 徹2012 年 38 巻 5 号 p. 200-206
発行日: 2012年
公開日: 2013/09/28
ジャーナル フリーThis study focuses on the understanding and modeling of the physical phenomena occurring in the heated surface of Silica Phenolic (hereafter referred as SiFRP) under exposure to high temperature gases when applied to liquid rocket engine (LRE) combustor. Although the understanding and modeling of the phenomena is supposed to be essential in designing LRE combustor, the works done in this fields are seldom seen in open literatures. When we look at the inner surface of SiFRP combustor of LRE after ground firing tests, the signs of white streak, melting and recession are sometimes observed. In this research, the experimental characterization activities on the SiFRP surface phenomena are conducted, based on the various optical measurements (digital camera, SEM (scanning electron microscope), XRF (X-ray fluorescence), spectral reflectivity (wavelength: 400-700 nm)) for the heated samples, namely, the ones from arcjet heating tests under Air or N2 stream conditions or the ones from SiFRP combustor after LRE.抄録全体を表示PDF形式でダウンロード (6208K) -
高橋 市弥, 伊藤 悠策, 矢代 茂樹, 武田 真一, 岩堀 豊, 高坪 純治, 岡部 洋二, 武田 展雄2012 年 38 巻 5 号 p. 207-215
発行日: 2012年
公開日: 2013/09/28
ジャーナル フリーIn this study, a newly developed ultrasonic wave-visualization technique was applied to scarf-repaired CFRP laminate with the artificial defect and an actual scarf-repaired part. The technique enables to visualize ultrasonic wave propagation and to detect damages by using the wave-visualization technique. First, impact damages in the CFRP joint specimens simulating scarf repair was observed by ultrasonic inspection and cross-sectional microscopy after impact test. Secondly, CFRP scarf-joint specimen with the artificial defect was inspected by using the wave-visualization technique. As a result, scattering and velocity change of visualized ultrasonic wave were observed at the damage area in scarf-repaired composite. Finally, an impacted scarf-repaired specimen was inspected by using the wave-visualization technique. The damage area was detected by visualized ultrasonic wave propagation. These results demonstrate that the wave-visualization technique is quite useful in damage detection of scarf-repaired composites.抄録全体を表示PDF形式でダウンロード (5172K)
- |<
- <
- 1
- >
- >|