Ihi Corporation

Akinori Tsuda

Koichi Inagaki

Hiroaki Hatanaka

Yuichi Yamaguchi

Hiroki Kawai

Hiroyuki Hishida

Akiyoshi Sato

Shinji Muto

Provided are a method and device for detecting arrangement disorder of fibers in a conductive composite material. A coil () is disposed at a position at which the coil () faces the conductive composite material, and thereby a current can be applied to the conductive composite material. Thus, work or the like for attaching electrodes to the conductive composite material is not required. As a result, the arrangement disorder of the fibers in the conductive composite material can easily be detected. A method for detecting meandering of fibers in a conductive composite material includes a step of disposing a magnetic field sensor () at a position at which the magnetic field sensor () faces a surface (Sa) of the conductive composite material such that a direction (D) of a magnetosensitive axis is horizontal with the surface (Sa) and is parallel to coil faces (). Therefore, the magnetic field sensor () measures a magnetic field, and thereby a portion at which the arrangement disorder of the fibers in the conductive composite material is present can be detected.

Method for detecting arrangement disorder of fibers in conductive composite material, and device for detecting arrangement disorder of fibers in conductive composite material

Provided is a method for inspecting an electroconductive composite material including disposing a detection magnetic field measurement unit, disposing a correction magnetic field measurement unit, applying a current, acquiring a detection magnetic field strength, acquiring a correction magnetic field strength, and detecting a portion in which arrangement of carbon fibers is disordered. The operation includes calculating a correction coefficient using the correction magnetic field strength and correcting the detection magnetic field strength using the correction coefficient.

Method for inspecting electroconductive composite material and device for inspecting electroconductive composite material

A pair of electrodes is connected to a test specimen in order to apply an electric current to the test specimen in the direction of a conductive fiber of each conductive fiber woven fabric of a plurality of prepregs as targets for verification of the presence or absence of waviness, among a plurality of prepregs constituting the test specimen composed of a conductive composite material, and then a magnetic field sensor is relatively scanned over the test specimen, while applying an electric current between the pair of electrodes, to determine a portion of the test specimen where a magnetic field variation is detected by the scanning of the magnetic field sensor as a portion where waviness of the conductive fibers of the conductive fiber woven fabric of the plurality of prepregs as targets for verification of the presence or absence of waviness is present. Thus, it is possible to grasp, for example, the condition of fibers of the conductive composite material in the test specimen as a whole.

Fiber waviness detection method and apparatus for conductive composite materials

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Koto-ku, Japan

Akinori Tsuda