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Volume 26 (2000)
- Issue 6 Pages 203-
- Issue 5 Pages 163-
- Issue 4 Pages 121-
- Issue 3 Pages 83-
- Issue 2 Pages 37-
- Issue 1 Pages 1-
Volume 26, Issue 5
Displaying 1-5 of 5 articles from this issue
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Yoshiharu YASUI2000 Volume 26 Issue 5 Pages 163-170
Published: September 15, 2000
Released on J-STAGE: August 11, 2009
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Naoki TAKANO, Kenjiro TERADA, Masaru ZAKO, Tomomi YOSHIOKA2000 Volume 26 Issue 5 Pages 171-178
Published: September 15, 2000
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSThe liquid composite molding process involves the coupling between the mechanical behaviors of solids and fluids. To simulate such a process, the evaluation of the permeability is indispensable, while most of previous researches are based on the experimental approach. On the other hand, this paper adopts the mathematical theory of homogenization, which is suitable to numerical analysis. After describing the formulation of the homogenization for solid-fluid mixture, the permeabilities of typical textile composites have been evaluated with the help of the finite element method. Due to the micro-macro features of the method, the consideration of the complex microstructures of knit, woven and “Kumi” cloth has led to not only the three-dimensionally anisotropic permeabilities, but also the characteristic microscopic velocity distribution of the fluids.View full abstractDownload PDF (7429K) -
Naoya SAITO, Mikio TAKEMOTO, Hiroaki SUZUKI, Kanji ONO2000 Volume 26 Issue 5 Pages 179-186
Published: September 15, 2000
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSUtilizing the waveform simulation method of bulkwave Acoustic Emission (AE) signals, dynamics (kinetics and kinematics) and progression of microfractures in an unidirectional C/C composite were studied. Frequency and orientation dependence of longitudinal (P-) wave velocity and attenuation were measured utilizing a laser ultrasonic system. Fracture dynamics were studied by the P-waveform simulation so that the computed P-wave amplitude and rise time best matches the monitored values. Here, both the response delay and the attenuation were taken into account. Progression of four fracture types, i.e., matrix crack (Type-1), fiber and inter-laminar debonding (Type-2 and -3) and fiber disbonding (Type-4) during four-point bending were revealed. A sudden propagation of large inter-laminar delamination occurred after the succession of small matrix cracks and inter-laminar debondings.View full abstractDownload PDF (4722K) -
Akira TODOROKI, Masafumi SASAI2000 Volume 26 Issue 5 Pages 187-197
Published: September 15, 2000
Released on J-STAGE: August 11, 2009
JOURNAL FREE ACCESSStacking sequence optimizations in composite plates are combinatorial problems often handled by genetic algorithms (GA). However the GAs often require large computational cost for evaluation of each individual. In order to overcome this problem, the present paper proposes the use of lamination parameters in an approach to the optimization process with the GAs. The optimization process requires precise approximation of design space using response surfaces to obtain the optimal result. However, stacking sequence optimizations are discrete problems, and it is difficult to find the optimality of the result on the lamination parameter space. For zooming response surfaces, we require the test method for the optimality. In the present study, adjacent laminates to the obtained optimal result are introduced on the lamination parameter space, and the optimality test method is proposed. The test method is applied to the buckling load maximization problem of a laminated composite plate, and the effectiveness is confirmed by the example.View full abstractDownload PDF (1343K) -
Hirofumi HARADA2000 Volume 26 Issue 5 Pages 198-200
Published: September 15, 2000
Released on J-STAGE: August 11, 2009
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