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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 6
Displaying 1-4 of 4 articles from this issue
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Masataka NOSAKA1994 Volume 20 Issue 6 Pages 215-223
Published: November 15, 1994
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (8700K) -
R. TANAHASHI1994 Volume 20 Issue 6 Pages 224-230
Published: November 15, 1994
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSThe purpose of this research is to establish the method of theoretically simulating the vibration spectrum which is very important to the performance of skis. For a uniform rigidity beam having a rectangular section and composed of N different materials, an equation of vibration which includes shear and rotatory inertia is solved for a natural frequency approximation under the condition of both ends free. To prove the approximation close enough, experiments are conducted on a monolithic material beam, a closed shell structure beam in which a reinforcement member encloses a core and a sandwich structure beam, with various materials. The results of the experiment indicate that very close approximation exists between the experimental values and theoretical values, and that the vibration spectrum of a beam composed of different materials can be estimated theoretically by using the modulus of longitudinal elasticity, modulus of transverse elasticity, density and size. Thus, more precise optimization can be established by employing the vibration spectrum in addition to the conventional material and structure design which has been determined by considering only the flexural and torsional rigidity.View full abstractDownload PDF (3258K) -
H. INOUE, Y. MOCHIDA, J. YAMAGUCHI, T. YUGE1994 Volume 20 Issue 6 Pages 231-235
Published: November 15, 1994
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSOn cutting the model uni-directional glass fiber reinforced plastic (GFRP) materials, the cut surfaces are classified into two modes by relation between the direction of yarn and the cutting direction. One is the hollow caused by the over-cut fibers, the other is the fuzzing caused by the uncut fibers. It was found with scanning electron microscope observation that the hollows of cut surfaces are caused by the bending fracture of fibers. Therefore the over-cut phenomenon of fibers was analyzed with the beam bending theory. This analysis was conducted as a problem of the cantilever beam acting the distributed load on elastic foundation. From this analysis, the position of maximum bending moment would occur deeper parts of the cut surfaces. The results of this analysis showed a good agreement with that of the experiments.View full abstractDownload PDF (544K) -
T. AKATSU, S. KOKUBO, Y. FUKUDA, Y. TANABE, E. YASUDA1994 Volume 20 Issue 6 Pages 236-244
Published: November 15, 1994
Released on J-STAGE: February 08, 2010
JOURNAL FREE ACCESSWhisker orientation of an sic-whisker/Al2O3 composite fabricated by doctor blade molding was investigated. The orientation of whiskers in a green sheet became higher with increase in viscosity and shear strain rate of slurry. Because, in the slurry, whiskers were rotated by the moment due to the distribution of viscous resistance which increase with viscosity and shear strain rate of slurry. Shrinkage of the thickness of a green sheet was also affected by whisker orientation. Hot-pressed body with the same degree of whisker orientation as that of green sheet could be fabricated. However, the orientation of whisker was lower than that in hot-pressed SiC-whisker/Al2O3 composite after extrusion molding with high squeeze ratio.View full abstractDownload PDF (9763K)
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