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Volume 33, Issue 1
Displaying 1-7 of 7 articles from this issue
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[in Japanese]2007 Volume 33 Issue 1 Pages 1-2
Published: January 15, 2007
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (1719K) -
Chiaki SATO2007 Volume 33 Issue 1 Pages 3-5
Published: January 15, 2007
Released on J-STAGE: August 11, 2009
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EnJie LU, Naoya KURAHASHI, Qing-Qing NI, Toshiyuki KOZU, Ken KURASHIKI ...2007 Volume 33 Issue 1 Pages 6-13
Published: January 15, 2007
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSMembrane materials with silica nano-hybrid polyurethane resin (PU) and glass fabric (GF) were developed and their weather resistance was investigated. The materials were examined with damage under both high temperature and UV exposure. As a result, the polyurethane resin was easily damaged in the high temperature heat deterioration or UV deterioration process. However, it is confirmed that the hybridization of nano-silica particle by sol-gel method has greatly improved both heat deterioration resistance and UV deterioration resistance. It was also indicted that an effective improvement of weather resistance can be obtained by both increasing the content of silica and changing a molecular structure. The materials hybridized with silica not only improved the storage modulus and the heat resistance but also broadened the applicability in the dynamic viscoelasticity characteristics. In addition, the developed materials would be made with an excellent high temperature characteristics and possibility to be enough for a membrane material by adjusting the content of silica or the molecular structure.View full abstractDownload PDF (7158K) -
Hiroki INOUE, Keiji OGI, Tetsuro SHIRAISHI2007 Volume 33 Issue 1 Pages 14-20
Published: January 15, 2007
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSThis paper describes effect of temperature on the resistance and piezoresistance behavior in a carbon fiber reinforced plastics (CFRP) unidirectional (UD) laminate under tensile loading. Resistance change of on- and off-axis specimens was examined during tensile loading at various temperatures. It was observed that the initial gage factor (IGF) shows temperature dependence for all the off-axis angles with the maximum at the angle of 12 degrees for all temperatures. Tempera-ture dependence of IGF was mainly attributed to temperature-dependent piezoresistivity and compliance. The resistivity decreased with increasing temperature for all the off-axis angles. This negative temperature coefficient of the UD laminate is ascribed to the temperature dependence of resistance of carbon fiber and the contact resistance between fibers.View full abstractDownload PDF (4433K) -
Kazuki SAKAMOTO, Satoshi KOBAYASHI2007 Volume 33 Issue 1 Pages 21-29
Published: January 15, 2007
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSBioactive ceramics/PLLA composites have been expected as a material for the fracture fixations which have more biocompatibility than monolithic PLLA. In this study, β-TCP/PLLA composites containing three different β-TCP contents (4.8, 9.5, 14.3 wt%) were prepared by injection molding. The bending strength of composites decreased and the bending modules of those increased with increasing β-TCP contents. The effect of β-TCP content on the tensile strength and modulus also to does the same tendency of that on bending properties. Nevertheless, the tensile strength was half of bending strength. The results of fracture surface observation showed that the fracture of the composites was initiated by debonding between β-TCP agglomeration and PLLA. In addition, predictions of he tensile stress-strain curves based on the damage mechanics considering the sift of neutral plane were in good agreement with the experimental results.View full abstractDownload PDF (9123K) -
Yoji OKABE, Shu MINAKUCHI, Nobuo SHIRAISHI, Ken MURAKAMI, Nobuo TAKEDA2007 Volume 33 Issue 1 Pages 30-37
Published: January 15, 2007
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSIn this research, optical fiber sensors and shape memory alloys (SMA) were incorporated into sandwich panels for development of a smart honeycomb structure with damage detection and shape recovery functions. First, small-diameter fiber Bragg grating (FBG) sensors were embedded in the adhesive layer between a CFRP facesheet and an aluminum honeycomb core. From the change in the reflection spectrum of the FBG sensors, the debonding between the facesheet and the core and the deformation of the facesheet due to impact loading could be well detected. Then, the authors developed the SMA honeycomb core and bonded the CFRP facesheets to the core. When an impact load was applied to the panel, the cell walls of the core were buckled and the facesheet was bent. However, after the panel was heated over the reverse transformation temperature of the SMA, the core buckling disappeared and the deflection of the facesheet was relieved. Hence the bending stiffness of the panel could be recovered.View full abstractDownload PDF (7977K) -
[in Japanese]2007 Volume 33 Issue 1 Pages 39
Published: January 15, 2007
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (126K)
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