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Volume 17 (1991)
- Issue 6 Pages 223-
- Issue 5 Pages 179-
- Issue 4 Pages 133-
- Issue 3 Pages 89-
- Issue 2 Pages 45-
- Issue 1 Pages 1-
Volume 17, Issue 2
Displaying 1-8 of 8 articles from this issue
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Tohru HIRANO, Kenji WAKASHIMA1991 Volume 17 Issue 2 Pages 45-52
Published: March 15, 1991
Released on J-STAGE: August 11, 2009
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Masaji HARAKAWA, Yasuaki ABE1991 Volume 17 Issue 2 Pages 52-57
Published: March 15, 1991
Released on J-STAGE: August 11, 2009
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T. FUKUDA, K. OSAKA, M. TANIGUCHI1991 Volume 17 Issue 2 Pages 58-65
Published: March 15, 1991
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSIn the present study, the mechanical property degradation due to fatigue damage in glassfiber reinforced plastics (GFRP) has been evaluated by acoustic emission (AR) techniques. Degradation of strength and stiffness of GFRP laminates subjected to cyclic bending loads was evaluated by measurement of the AE behaviors under the static bending loads. In the ex-periments, three levels of amplitude of applied stress and two kinds of load cycles whose ratios to the fatigue life were 0.6 and 0.8 were adopted for giving the specimens fatigue damage. Under six kinds of cyclic loading conditions the relationship between the AR parameters and the degradation of strength and stiffness was obtained. From the results the followings were made clear. The total AE ringdown counts increased with the degradation of strength and stiffness. The relationship between the total AE ringdown counts and the residual strength suggested that the fatigue damage could be different in spite of the same residual strength. Many AR event counts above 80 dB in amplitude were observed in specimens subjected to the cyclic loadings. The ratio of the AE event counts above 80 dB amplitude to the total AR event counts well indicated the degradation of strength and stiffness due to fatigue damage.View full abstractDownload PDF (2591K) -
C. MASUDA, Y. TANAKA, M. YAMAMOTO, M. FUKAZAWA1991 Volume 17 Issue 2 Pages 66-73
Published: March 15, 1991
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSEffect of the volume fraction on the fatigue strength was studied for three commercially fabricated aluminum matrix composites containing SiC whiskers (SiCw) and SiC particles (SiCp). The fatigue strength of SiCw/A2024 composite increased with the increase of the volume fraction of SiC whiskers, while the fatigue strength of SiCp/A356 composite showed maximum at a volume fraction of 10%. The fractography revealed that the fatigue crack would initiate at many voids situated near the specimen surface (fish eye failure) for 20%-SiCp/A356. It is suggested that the fatigue strength decreases due to the fish eye failure for 20%-SiCp/A356 composite. It is pointed out that the fish eye failure would prevent to improve the fatigue strength for SiC particulate reinforced aluminum composites.View full abstractDownload PDF (4515K) -
H. KASUYA1991 Volume 17 Issue 2 Pages 74-79
Published: March 15, 1991
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSIn general, laminated composite cylindrical shells exhibit the effect of lamination constitution due to the anisotropy and the unsymmetry of lamination. In the present paper, the buckling problems of carbon fiber/epoxy (CFRP) cross-ply and angle-ply laminated cylindrical shells under torsion are considered. That is, the effects of stacking sequence, number of layers, lamination angle, buckling modes and dimension of cylinders, on the buckling stresses are analysed by use of the equilibrium equation based on the Donnell-type expressions.View full abstractDownload PDF (539K) -
K. FUJITA, Y. SAWADA, K. HONJO1991 Volume 17 Issue 2 Pages 80-84
Published: March 15, 1991
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSVarious barrier coatings were deposited on PAN-based high strength type carbon fibers from vapor phase. The coatings were carbon layer (C) or various double layers consisting of a carbon under-layer and a ceramic over layer (denoted by C/TiC, C/TiN, C/SiC). After Ti-B m, ixture was coated on the fibers, molten aluminum alloy was infiltrated to prepare CFRAI wire. These wires were heated at 500°C for 3 days in a vacuum. Tensile strength of the wire, tensile strength of the filament in the wire, filament pull-out length at tensile fracture surface and the amount of formed aluminum carbide were measured. Among these coatings, C and C/TiC had low effect as a reaction barrier between fiber and aluminum, while the interfacial bonding strength between the coated carbon fiber and aluminum increased by the heat treatment. Though C/SiC and C/TiN had high effect to reduce the reaction, the interfacial bonding strength decreased by the heat treatment. Totally judging, C/SiC was the best among these barrier coatings.View full abstractDownload PDF (634K) -
[in Japanese]1991 Volume 17 Issue 2 Pages 87
Published: March 15, 1991
Released on J-STAGE: August 11, 2009
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[in Japanese]1991 Volume 17 Issue 2 Pages 87a
Published: March 15, 1991
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (155K)
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