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Volume 39 (2013)
- Issue 6 Pages 212-
- Issue 5 Pages 167-
- Issue 4 Pages 127-
- Issue 3 Pages 89-
- Issue 2 Pages 49-
- Issue 1 Pages 10-
Volume 39, Issue 1
Displaying 1-4 of 4 articles from this issue
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Research paper
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Akira TODOROKI2013 Volume 39 Issue 1 Pages 10-15
Published: 2013
Released on J-STAGE: March 28, 2014
JOURNAL FREE ACCESSWhen an alternating current is applied to a conductive slab, the induced current impedes the electric current and this causes skin effect for all conductive materials. For laminated Carbon Fiber Reinforced Plastics (CFRP), however, the skin-effect depth is not evaluated. In the present study, therefore, Maxwell’s equations are analytically solved, and the skin-effect depth of unidirectional CFRP is derived first. Using the result, skin-effect is analyzed for the laminated CFRP. As a result, the skin-effect depth is derived for the laminated CFRP, and the effect is compared with the newly defined skin-effect of direct current caused by strong anisotropic conductance. For the highly toughened CFRP that has resin rich layers, the skin-effect of the direct current is more important than that of alternating current.View full abstractDownload PDF (542K) -
Yasuhiro TANABE, Masayoshi YAMADA, Nobusuke KOBAYASHI, Narumichi SATO, ...2013 Volume 39 Issue 1 Pages 16-23
Published: 2013
Released on J-STAGE: March 28, 2014
JOURNAL FREE ACCESSCarbon fiber reinforced plastic (CFRP) is widely used in making structural components of aircraft because of its high specific strength and high specific elasticity. Since aircrafts are inevitable risks from foreign object damage (FOD), it is important to understand the effects of elements, i.e., fiber, matrix resin and interface, in CFRP on the impact phenomena of CFRP by projectile’s impact. In this study, we conducted impact tests and investigated the effects of the elements on its impact phenomena and dissipated energy by using three-dimensional (3D) measurements in the deformation process under high-velocity projectile impact. It was estimated that deformation of CFRP was dissipated more than 30％, ever 70％ in a greater case, of the kinetic energy of a projectile. It was also revealed that the CFRP, consisting of carbon fiber with high-strength and large-failure-strain and deformable resin, could dissipate large kinetic energy of a projectile.View full abstractDownload PDF (1672K) -
Hideaki KATOGI, Yoshinobu SHIMAMURA, Keiichiro TOHGO, Tomoyuki FUJII, ...2013 Volume 39 Issue 1 Pages 24-30
Published: 2013
Released on J-STAGE: March 28, 2014
JOURNAL FREE ACCESSNatural fiber reinforced composites are carbon neutral materials and expected to be the alternative of GFRP. In this study, the effects of matrix properties on fatigue strength of unidirectional jute spun yarn reinforced biodegradable plastics were investigated. PLA and PBS were used for matrix. PLA is brittle, but widely used for matrix of green composites. PBS has much higher ductility than that of PLA and then would be expected to have higher fatigue strength when PBS is subjected to the same strain amplitude as PLA. Fatigue tests were conducted under conditions that the maximum stress was set to 40%–90% of the tensile strength and the stress ratio was set to 0.1. The results revealed, as anticipated, that Jute/PBS composite had higher fatigue strength than Jute/PLA composite.View full abstractDownload PDF (1924K) -
Tomohiro YOKOZEKI, Yayoi KOBAYASHI, Takahira AOKI, Daishiro YOSHIDA, T ...2013 Volume 39 Issue 1 Pages 31-35
Published: 2013
Released on J-STAGE: March 28, 2014
JOURNAL FREE ACCESSThis paper introduces Porous Mold Process (PMP) as a reliable low-cost manufacturing process of fiber-reinforced composites. PMP using porous aluminum is applied to the vacuum-assisted resin transfer molding (VaRTM) process of carbon fiber reinforced plastics (CFRP). Experimental evaluation on resin infusion behavior and quality and mechanical properties of the cured plates is performed with varying the dimensions of the plates. The results show that quality and mechanical properties of the cured plates using PMP are satisfactory, stable, and almost independent of plate dimensions. It is concluded that PMP provides a reliable and knowhow-less resin infusion process of composite materials.View full abstractDownload PDF (1128K)
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