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Volume 14 (1988)
- Issue 6 Pages 211-
- Issue 5 Pages 173-
- Issue 4 Pages 131-
- Issue 3 Pages 91-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
Volume 14, Issue 2
Displaying 1-6 of 6 articles from this issue
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Tetsuya TATEISHI1988 Volume 14 Issue 2 Pages 49-56
Published: March 15, 1988
Released on J-STAGE: August 11, 2009
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Mitsunori MIKI, Yoshisada MUROTSU1988 Volume 14 Issue 2 Pages 56-62
Published: March 15, 1988
Released on J-STAGE: August 11, 2009
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M. SHIWA, M. ENOKI, T. KISHI1988 Volume 14 Issue 2 Pages 63-72
Published: March 15, 1988
Released on J-STAGE: February 08, 2010
JOURNAL FREE ACCESSThe present paper purposes a new factor of Acoustic Emission (AE) to estimate the damage of factor in fiberglass-epoxy composites. Both notched and unnotched specimens were prepared for the tests. AE signal was monitored during the tensile, the loading-holding, and the unloading-reloading testings on this material. History of amplitude or energy distribution of AE showed that the factor process during the tensile testing is dependent upon the specimen geometry. Although the source locations of the events during the tensile testing were widely distributed over the specimen, the damage area leading to final failure could be clearly located by the cumulative AE energy. In the loading-holding testing specimens were subjected to similar loading procedure to that of the ASME standard (Section 5, 11). The ratio (H=Nl/Nn) of event counts during holding (Nn) and during loading was shown to be a good indicator to predict the ultimate stress. Kaiser Effect Ratio (Felicity Ratio) was carefully studied during the sequential loading and unloading cycles. It is concluded that the ratio (Damage Factor, (DF=Eu/El) of event counts during unloading (Eu) to that during loading (El) is to be a good indicator to predict the generated micro crack from AE results and SEM observations.View full abstractDownload PDF (12014K) -
H, HATTA1988 Volume 14 Issue 2 Pages 73-80
Published: March 15, 1988
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSFiber orientation distribution and the maximum volume fraction of three dimensional fabric composites have been studied systematically. The fiber structures which could be fabricated were shown to be derived from the polyhedra that completely filled up the three dimensional space. Then, an analytical study was carried out to clarify the relationship between the fiber construction and the composite properties, i.e. elastic moduli and thermal expansion coefficients, based on the previously proposed analytical model. Although the complete isotropy of the moduli was obtainable theoretically by adequately placing 6 fiber orientation axes, it was difficult to fabricate the preform by this number of fiber axes. Among the practicable preforms, that with 7 fiber orientation axes was shown to be most useful for tailoring the thermomechanical properties because it could afford to yield wide spectrum of properties ranging from strong anisotropy to near isotropy.View full abstractDownload PDF (7296K) -
Zenichiro MAEKAWA1988 Volume 14 Issue 2 Pages 81-86
Published: March 15, 1988
Released on J-STAGE: August 11, 2009
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1988 Volume 14 Issue 2 Pages 87-88
Published: March 15, 1988
Released on J-STAGE: February 08, 2010
JOURNAL FREE ACCESSDownload PDF (293K)
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