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Nakada M.,Kanazawa Institute of Technology | Ozaki H.,Tsudakoma Corporation | Miyano Y.,Kanazawa Institute of Technology
Conference Proceedings of the Society for Experimental Mechanics Series | Year: 2016

This study was concerned with the effect of stamping condition on age deformation after stamping for textile carbon fiber reinforced Polycarbonate (CF/PC) laminates. The textile CF/PC laminates were stamped to hat shape under various stamping temperatures. The specimens were held at several exposure temperatures into the constant temperature chamber after stamping process and the variations of hat angle against exposure time were measured. As results, it is cleared that the age deformation is suppressed with increasing stamping temperature. The variation of hat angle as the long-term dimensional stability can be predicted from the measured data at elevated temperatures based on the time-temperature superposition principle which is held for the viscoelasticity of matrix polycarbonate. © The Society for Experimental Mechanics, Inc. 2016.


Ozaki H.,Tsudakoma Corporation | Ozaki H.,Kanazawa Institute of Technology | Nakada M.,Kanazawa Institute of Technology | Uzawa K.,Kanazawa Institute of Technology | Miyano Y.,Kanazawa Institute of Technology
Journal of Reinforced Plastics and Composites | Year: 2014

The effects of molding conditions on the flexural strength of textile carbon fiber reinforced polycarbonate laminates were assessed. Choosing the temperature and pressure conditions appropriately during hot-press molding using carbon fiber textile layers and polycarbonate films can produce void-free, high interfacial adhesion in textile carbon fiber reinforced polycarbonate laminates. Those characteristics were confirmed from observing the cross-sections of carbon fiber reinforced polycarbonate laminates and measuring the interlaminar shear strength. A suitable molding condition can raise the flexural strength of carbon fiber reinforced polycarbonate laminates to a level predicted from the measured flexural strength of textile carbon fiber/epoxy laminates by assuming carbon fiber micro-buckling in the compression side of specimens. © The Author(s) 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.


Ozaki H.,Tsudakoma Corporation | Ozaki H.,Kanazawa Institute of Technology | Nakada M.,Kanazawa Institute of Technology | Uzawa K.,Kanazawa Institute of Technology | Miyano Y.,Kanazawa Institute of Technology
Journal of Reinforced Plastics and Composites | Year: 2015

This study examines the effect of stamping condition on age deformation after stamping of textile carbon fiber reinforced polycarbonate laminates. The laminates were stamped to a hat shape at various stamping temperatures between the glass transition temperature Tg and the melting temperature Tm of polycarbonate. Then the age deformation, which is the hat angle variation, was measured. Results show that the age deformation occurs at the stamping temperature in the vicinity of Tg. The age deformation is suppressed when the stamping temperature is sufficiently higher than Tg. Furthermore, the long-term age deformation as the dimensional stability was predicted from the measured deformation at elevated temperature based on the time-temperature superposition principle for the viscoelasticity of the polycarbonate matrix. © The Author(s) 2014.


Ozaki H.,Tsudakoma Corporation | Ozaki H.,Kanazawa Institute of Technology | Saito H.,Kanazawa Institute of Technology | Nakada M.,Kanazawa Institute of Technology | Miyano Y.,Kanazawa Institute of Technology
Journal of Reinforced Plastics and Composites | Year: 2015

This study prepared textile carbon fiber reinforced polycarbonate laminates of three kinds molded with different conditions and carbon fiber reinforced epoxy laminates consisting of the same carbon fiber textile. Drop-weight impact tests were conducted for these four laminates with three levels of impact energies. The residual flexural strengths were measured after impact. Results show that the residual flexural strengths for all laminates decrease clearly with increasing impact energy. The flexural strengths of these laminates without impact damage have mutually different values. Furthermore, the laminates exhibit a decreasing ratio of residual flexural strength by impact damage with mutually differing values. The reasons were examined through observations conducted using ultrasonic flaw detection and digital microscope. © The Author(s) 2015 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.


Ozaki H.,Tsudakoma Corporation | Nakada M.,Kanazawa Institute of Technology | Uzawa K.,Kanazawa Institute of Technology | Miyano Y.,Kanazawa Institute of Technology
Proceedings of the American Society for Composites - 29th Technical Conference, ASC 2014; 16th US-Japan Conference on Composite Materials; ASTM-D30 Meeting | Year: 2014

This study is concerned with the effect of molding condition on the flexural strength of textile carbon fiber reinforced polycarbonate (CF/PC) laminates. The void free and high interfacial adhesion in textile CF/PC laminates were realized by choosing appropriately the temperature and pressure conditions during hot-press molding by using carbon textile layers and PC films. The void free and high interfacial adhesion were confirmed by observing cross-section of CF/PC laminates and measuring interlaminar shear strength. By choosing suitable molding condition, the flexural strength of CF/PC laminates reached to that predicted from the measured flexural strength of textile CF/Epoxy laminates by assuming the micro-buckling of carbon fibers in the compression side of specimens.


Kanamaru Y.,Kanazawa University | Asakawa N.,Kanazawa University | Okada M.,Kanazawa University | Nakayabu T.,Kanazawa University | And 6 more authors.
Proceedings of the 6th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2011 | Year: 2011

On a machine tool, geometric deviations (positional and angular deviation) occur according to the movement of table, column, and so on. On the other hand, a laser measurement system has become popular, since it performs highly accurate measurement of the each geometric deviation except for roll deviation. In this paper, we focus on the improvement of measurement sensitivity of roll. The system consists of a bi-prism, a double-path optical heterodyne laser interferometer and a V-shaped reflector which composed of two plane mirrors. For improvement of measurement sensitivity, reflexive reflecting prisms are attached on the rear-side of the interferometer to make number of laser paths increase comparing with the conventional system. From the experimental results, it is confirmed that measurement sensitivity is increased in proportion to the number of laser paths.


Patent
Kyoto Institute of Technology and TSUDAKOMA Corporation | Date: 2012-10-01

According to the present invention, a carbon-fiber preform for a carbon-fiber-reinforced plastic is formed from mutually intersecting warp and weft each of which including a carbon-fiber multifilament yarn. At least one of layer surfaces has fluff formed by cutting some of filaments of the carbon-fiber multifilament yarn, and a total fluff length of fluff formed on the warp and a total fluff length of fluff formed on the weft are not equal. The present invention provides a CFRP in which the delamination strength (interlaminar shear strength) is improved and that has a high strength.


Patent
Tsudakoma Corporation and Kyoto Institute of Technology | Date: 2014-10-01

According to the present invention, a carbon-fiber preform for a carbon-fiber-reinforced plastic is formed from mutually intersecting warp and weft each of which including a carbon-fiber multifilament yarn. At least one of layer surfaces has fluff formed by cutting some of filaments of the carbon-fiber multifilament yarn, and a total fluff length of fluff formed on the warp and a total fluff length of fluff formed on the weft are not equal. The present invention provides a CFRP in which the delamination strength (interlaminar shear strength) is improved and that has a high strength.


Izawa M.,Tokyo Institute of Technology | Dotani T.,Tokyo Institute of Technology | Dotani T.,Japan Aerospace Exploration Agency | Fujinaga T.,Tsudakoma Corporation | And 3 more authors.
Publications of the Astronomical Society of Japan | Year: 2015

A largely extended X-ray emission was discovered around the pulsar PSRJ1357-6429 with the Suzaku deep observations. The pulsar, whose characteristic age is 7.3kyr, is located within the TeV γ-ray source HESSJ1356-645. The extended emission is found to have a 1σ X-ray size of ∼4", or ∼3pc at 2.4 kpc, with a small offset from the pulsar. Its X-ray spectrum is well reproduced by a simple power-law model with a photon index of 1.70 -0.06 +0.07. No significant spatial variation was found for the X-ray photon index as a function of distance from the pulsar. We conclude that the extended emission is associated to the pulsar wind nebula (PWN) of PSRJ1357-6429. This is a new sample of largely extended nebulae around middle-aged pulsars. We discuss the evolution of this PWN according to the relic PWN scenario. © 2015 The Author 2015.

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