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Volume 20 (1994)
- Issue 6 Pages 215-
- Issue 5 Pages 173-
- Issue 4 Pages 131-
- Issue 3 Pages 91-
- Issue 2 Pages 57-
- Issue 1 Pages 1-
Volume 20, Issue 4
Displaying 1-7 of 7 articles from this issue
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Shigeru HASUMI1994 Volume 20 Issue 4 Pages 131-136
Published: August 15, 1994
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (2000K) -
M. SHIWA, N. TAKEDA, T. KISHI1994 Volume 20 Issue 4 Pages 137-143
Published: August 15, 1994
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSResponse properties of piezoelectric AE sensors (PZT) on CFRP laminate were evaluated by using simulate AE source. Sensitivity properties and frequency responses of the sensor for both quasi-longitudinal wave (QL) and quasi-transverse wave (QT) from pencil lead breaking source were analyzed as a function of the fiber orientation and detection direction of the sensor. The sensitivity of piezoelectric sensor were controlled by 1) the main displacement direction of QL and QT, 2) transmission ratio between fibers and/or matrix and PZT, 3) polling direction of the piezoelectric device and 4) piezoelectric constants. When the sensor mounted at the side of the plate transverse to the fiber orientation, QL could detect with high sensitivity. Its condition will be carried out high resolution source location. While, when the sensor mounted on the plate surface, QL could detect with high sensitivity. The frequency response of the sensor depended on 1) acoustic impedance matching between the fibers and/or the matrix and the PZT, 2) resonant frequency of structural dispersion in the plate and 3) resonant frequency of material dispersion in the plate.View full abstractDownload PDF (799K) -
J. FUJIMOTO, T. TAMURA, I. KIMPARA, T. TANIMOTO1994 Volume 20 Issue 4 Pages 144-153
Published: August 15, 1994
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSNew materials, that possess high damping capabilities and high strength properties, have been studied in carbon fiber reinforced plastics (CFRP). These materials are referred to in this article as CFRP/damping-material laminates. The CFRP/damping-material laminates investigated here are composed of a unidirectional carbon/epoxy prepreg sheet and a polyethylene based damping material sheet used as an interleaf. Cantilever beam tests revealed the high damping properties of these laminates. Loss factor values for these composites are 10 to 100 times as large as that for conventional CFRP. These values could be predicted by using the constrained layer damping theory, except for two specimens.View full abstractDownload PDF (2288K) -
J. FUJIMOTO, T. TAMURA, I. KIMPARA, T. TANIMOTO1994 Volume 20 Issue 4 Pages 154-161
Published: August 15, 1994
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDiscussed here are high damping structural materials in which damping materials are interlaminated with carbon fiber reinforced plastics (CFRP). Damping properties under longitudinal vibration were evaluated using [+θ/-θ] s angle-ply based laminates. Loss factor values for these laminates are 0.015-0.1, which are 2 to 20 times as large as that for conventional CFRP. Theoretical and FEM analysis were used to predict the damping properties. Good agreement was obtained between these predictions and the experimental results at low temperature range.View full abstractDownload PDF (792K) -
Yutaka MAEDA, Hitoshi KODAMA, Hisao KOBA, Takeo GOMI, Takaaki NAKAGAWA1994 Volume 20 Issue 4 Pages 162-164
Published: August 15, 1994
Released on J-STAGE: August 11, 2009
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Cao Minh THAI, Nobuo MASAKI, Mitsuhiko KOYAMA1994 Volume 20 Issue 4 Pages 165-167
Published: August 15, 1994
Released on J-STAGE: August 11, 2009
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Tsuneo TANAKA, Kensuke YAGI, Nobuo KOJIMA, Kozo KIMURA, Hideo KATSUMAT ...1994 Volume 20 Issue 4 Pages 168-169
Published: August 15, 1994
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (1118K)
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