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Volume 30, Issue 1
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[in Japanese]2004 Volume 30 Issue 1 Pages 1-2
Published: January 15, 2004
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (1776K) -
Yujiro NISHI2004 Volume 30 Issue 1 Pages 3-9
Published: January 15, 2004
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (6003K) -
Takanori FUKUSHIMA2004 Volume 30 Issue 1 Pages 10-15
Published: January 15, 2004
Released on J-STAGE: August 11, 2009
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Study on Initial Failure in Tension of Glass Woven Fabric/Epoxy Composite with Functional InterphaseKenichi SUGIMOTO, Toshiko OSADA, Nobuyoshi KAJIOKA, Asami NAKAI, Hiroy ...2004 Volume 30 Issue 1 Pages 16-23
Published: January 15, 2004
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSRecently the term of interphase is recognized and mainly used instead of the term of interface because the interphase should be considered not only for two dimensional boundary plane between fiber and matrix but also the three dimensional volume containing the region of matrix resin modified by silane coupling agent. In this paper, the functional interphase as a new concept of composites interphase was suggested. It is expected that the functional interphase could improve the performance of composites and add the farther function such as strengthening, toughening and so on. In this study the static tensile properties and initial failure behavior of glass woven fabric/epoxy composite plate with flexible interphase were investigated. The modulus and the strength were kept the same in any thickness of flexible interphase. The thickness of flexible interphase was well controlled by changing the concentration of flexible resin to the chemical solvent of acetone. The first and second Knee Points were identified by least squires method on tensile stress-strain curves. The Knee Point stress was maximized at 1.0 wt.% and decreased with increase in concentration. Accordingly the optimum concentration, namely optimum thickness exists to improve the initial failing stress.View full abstractDownload PDF (7662K) -
Kentaro IWASHITA, Zhishen WU, Takashi ISHIKAWA, Yasumasa HAMAGUCHI, To ...2004 Volume 30 Issue 1 Pages 24-32
Published: January 15, 2004
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSThe purpose of this study is to improve the examining and understanding of the bonding behavior of fiber reinforced polymer (FRP) sheets bonded to concrete blocks and steel plates under fatigue loading. First, a series of experimental investigations is summarized in the paper. The fatigue behavior of bonding surface between FRP sheets and concrete is finally characterized by the conducted P-S-N diagram representing the relationship among the probability of FRP debonding (P), the bond stress amplitudes (S), and the number of cycles (N) at debonding on a semilogarithmic scale. The different debonding modes for various fracturing surface are also investigated and evaluated.View full abstractDownload PDF (8954K) -
Shifumi AIZAWA, Toshio OGASAWARA, Takeshi OGAWA2004 Volume 30 Issue 1 Pages 33-40
Published: January 15, 2004
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSThis paper addressed a new sensitive strain monitoring system in SiC fiber reinforced plastic composite in comparison with that of in carbon fiber reinforcement. Carbon fibers in CFRP can be used as sensors to detect fiber elongation and fiber breaks for the electrical resistance changes. However, in low strain range (<1%), the electrical resistance change derived from fiber breaks is relatively less than expected that from fiber elongation because of the electrical conduction between neighboring fibers. In this study, surface oxidized SiC fibers were applied to prevent the electrical conduction between neighboring fibers. Model specimens were made by embedding as-received or oxidized SiC fibers into epoxy resin, and the electrical resistance changes were measured under tensile tests. As a result, electrical resistance of an oxidized SiC fiber composite increased remarkably with increasing strain as compared to an as-received SiC fiber composite. Cumulative fracture probabilities of oxidized fibers embedded in the model specimens were predicted from measured electrical resistance change, and the strength distributions were analyzed based on Weibull statistics. The effect of effective gage length on electrical resistance behaviors was discussed using the experimental result on single fiber fragmentation tests.View full abstractDownload PDF (8066K)
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