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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 3
Displaying 1-6 of 6 articles from this issue
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Toshiyuki HASHIDA, Hideaki TAKAHASHI1991 Volume 17 Issue 3 Pages 89-97
Published: May 15, 1991
Released on J-STAGE: August 11, 2009
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Katsuaki SUGANUMA1991 Volume 17 Issue 3 Pages 97-107
Published: May 15, 1991
Released on J-STAGE: August 11, 2009
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Z. MAEKAWA, H. HAMADA, S. ISHIBASHI1991 Volume 17 Issue 3 Pages 108-117
Published: May 15, 1991
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSA nonlinear behavior between tensile stress and tensile strain for carbon fiber and its composites is pointed out. In carbon fiber and its unidirectional composites, an increase of stiffness with increasing strain level is observed. Tensile elastic modulus is defined as a gradient of stress versus strain ; tangent modulus, secant modulus and chord modulus have been used. The value of the elastic modulus is varied related with method of evaluation and the range of applied strain. Therefore it is necessary to define the method of evaluation of the elastic modulus. In this paper, three kinds of method for the elastic modulus evaluation is exam-ined. As a results, initial tangent modulus is the best because of its universality. If evaluation of tangent modulus is difficult, chord modulus is desirable because of its smaller error with the evaluation. It is also required for the chord modulus that the strain range applied is declared.View full abstractDownload PDF (2932K) -
H. SEKINE, S. KAMIYA, T. SASAKI1991 Volume 17 Issue 3 Pages 118-124
Published: May 15, 1991
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDamage extension behavior at the notch tip in a short fiber reinforced SMC composite is experimentally examined from the view point of the release of elastic strain energy which is supposed to control the microcrack extension in brittle fiber-brittle matrix composites. We carried out experiments on the transparent nonfiller SMC composite which enabled us to see clearly the microcracks in the damage region, and we realized that almost all the microcracks were debondings of strands. Damage initiates at the early stage of loading and afterwards extends rapidly with the sudden increment of AE signals, which corresponds to the beginning of fiber breakage at the notch tip. However, the amount of released elastic strain energy appears to be roughly proportional to the accumulated AE energy and also to the area of damage region, and these linear relationships are not affected by the beginning of the fiber breakage. These facts lead us to the conclusion that the release of elastic strain energy during the whole fracture process of the SMC composite is owing mostly to the debondings of strands.View full abstractDownload PDF (8363K) -
Masuji UEMURA1991 Volume 17 Issue 3 Pages 125-128
Published: May 15, 1991
Released on J-STAGE: August 11, 2009
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[in Japanese]1991 Volume 17 Issue 3 Pages 130
Published: May 15, 1991
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSDownload PDF (154K)
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