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Volume 23, Issue 1
Displaying 1-6 of 6 articles from this issue
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[in Japanese]1997 Volume 23 Issue 1 Pages 1-2
Published: January 15, 1997
Released on J-STAGE: August 11, 2009
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Shintaro KITADE1997 Volume 23 Issue 1 Pages 3-6
Published: January 15, 1997
Released on J-STAGE: August 11, 2009
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Sunao SUGIMOTO, Takashi ISHIKAWA1997 Volume 23 Issue 1 Pages 7-14
Published: January 15, 1997
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSInfrared stress measurement technique is applied for non-destructive evaluation of composites with advantage of in-situ and non-contact nature. Thermo-elastic constants of unidirectional carbon-epoxy (CFRP) needed for quantitative measurements are obtained by the infrared stress graphic system. The theoretical thermo-elastic constants are derived through the basic equations and compared with the experimental values. As a consequence, a reliability of the measured thermo-elastic constants is established and capability of this system for quantitative stress measurement is shown. It is also demonstrated that temperature dependency of a transverse coefficient of thermal expansion and a specific heat at constant stress of UD-CFRP cancel each other so as to decrease the temperature dependency of the thermo-elastic constant. This finding can be considered as an advantage of the infrared stress measurement for CFRP. In addition, other influential factors on the measurements are examined. In conclusion, basic knowledge and detailed technique for quantitative infrared stress measurements of CFRP are established.View full abstractDownload PDF (9776K) -
Katsutoshi YAMADA, Syouichi SEKIGUCHI, Tohru INOUE1997 Volume 23 Issue 1 Pages 15-25
Published: January 15, 1997
Released on J-STAGE: February 08, 2010
JOURNAL FREE ACCESSThe effect of the interfacial shear strength between the carbon fibers and the matrix of carbon fiber reinforced aluminium alloys (CFRM:two PAN based high modulus and a PAN based high strength CFs, Vf=70%) on the bending strength and the compressive strength has been studied. As the interfacial shear strength increases from a lower level of 5 MPa to a higher level of 25 MPa, the tensile strength of the CFRMs contains high modulus CFs decreases rapidly from a high level of 1, 300 MPa to a low level of 500 MPa. However, as the interfacial shear strengths is varied in this region, the compressive strength of the same CFRM increases sharply from a level of 400 MPa to a level of 1, 600 MPa. The compressive strengths of the CFRMs show a high, constant level of 1, 600 MPa in the range of interfacial shear strengths over 40 MPa. CFRMs with low interfacial shear strengths show fracture at the interface and compressive collapse in compression tests. As the interfacial shear strength of the CFRMs increases, fracture at the interface is reduced, and the probability of shear fracture increases. These changes increase the compressive strengths of the CFRMs. When the level of interfacial shear strength is over 40 MPa and the compressive strengths of the CFRMs exhibit an almost constant level of 1, 600 MPa, in this case the compressive specimens show complete shear fracture mode. The interfacial shear strength is considered to depend on the content of Al4C3 accumulated at the interface in the CFRMs.View full abstractDownload PDF (15742K) -
Hisayoshi IBA, Yutaka KAGAWA1997 Volume 23 Issue 1 Pages 26-30
Published: January 15, 1997
Released on J-STAGE: February 08, 2010
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Yasuhiro TOI, Hiroyuki NAKAMURA1997 Volume 23 Issue 1 Pages 31-38
Published: January 15, 1997
Released on J-STAGE: August 11, 2009
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