Journal of the Japan Society for Composite Materials

Optimizations of Stacking Sequence and Number of Plies for Laminated Cylinders Using GA with Intron Genes

Akira TODOROKI, Masafumi SASAI

2001 Volume 27 Issue 4 Pages 181-187
Published: July 15, 2001
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.27.181

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For the method to optimize stacking sequences and number of plies of composites, the present paper proposes a new intron method. The intron method is developed from the recessive gene like repair method that is employed for implements of stacking-sequence constraints without causing decrease of the design reliability of GA. The intron method is attempted for the optimizations of laminated cylinders to maximize the buckling load and to minimize the number of plies. As a result, the intron method successfully obtained the real optimal stacking sequences and the number of plies without decrease of design reliabilities.

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Fiber Reinforced Composites with a New Heat-Resistant Polymer Matrix Containing Silicon

Masayoshi ITOH, Koji INOUE, Norio HIRAYAMA, Masaki SUGIMOTO, Tadao SEG ...

2001 Volume 27 Issue 4 Pages 188-193
Published: July 15, 2001
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.27.188

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FRPs, reinforced with carbon fiber, SiC fiber and glass fiber, were prepared by using a new thermosetting polymer containing silicon, poly[(phenylsilylene) ethynylene-1, 3-phenyleneethynylene], as a matrix and the characteristics of the FRPs were investigated. The fobrication process has some advantages, such as no need of solvent, no by-products, and low curing temperature (150-210°C). For the FRPs, high heat-, burn- and radiation-resistant properties were obtained. Bending strengths (110-140 MPa) as well as moduli (30 GPa) at room temperature, 200°C, and 400°C were observed to be almost equal respectively, and no change even at 100 MGy of irradiation. Dynamic viscoelasticity and creep of the FRPs were also measured and compared with those of the FRP with polyimide matrix.

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Diagnosis Method for Detection of Delamination of CFRP by Electric Resistance Change

Comparison of Response Surfaces and Artificial Neural Networks

Atsushi IWASAKI, Akira TODOROKI

2001 Volume 27 Issue 4 Pages 194-200
Published: July 15, 2001
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.27.194

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The present study employs an electric resistance change method for identifications of delamination cracks. For the method, diagnostic tools for the inverse problems to identify the delamination crack location and size from the electric resistance changes are discussed. FEM analyses are conducted to obtain electric resistance changes due to delamination crack creations with fiveelectrode type specimens. By comparisons of the estimations with the Artificial Neural Networks (ANNs) and with the response surfaces (RS), a better diagnostic tool is discussed in detail. As a result, because of overlearning of neural network, the presumed error of new data with ANNs is large, and the RS using quadratic polynomials is a better tool than ANNs for identifications of delamination crack location and size using electric resistance change.

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Compression Modulus and Master Curves of Dynamic Viscoelastic Parameters in Hard Polyurethane Foams

Hiromasa ADACHI, Teruo HASEGAWA

2001 Volume 27 Issue 4 Pages 201-206
Published: July 15, 2001
Released on J-STAGE: August 11, 2009

DOIhttps://doi.org/10.6089/jscm.27.201

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