Mitsubishi Heavy Industries Limited

Takahito Shimomukai

Seiji Kobayashi

Mitsuyoshi Uematsu

Hiroshi Takemoto

Noriya Hayashi

Yuji Maruyama

Junko Watanabe

Naoya Iwata

Jumpei Komoto

Ultrasonic flaw detection uses a phased-array ultrasonic-flaw-detection probe. The flaw detection probe is placed such that the center of curvature of the flaw detection probe coincides with a reference center of curvature of a subject. The flaw detection probe is translated along a scan direction. The flaw detection probe emits an ultrasonic beam such that the position upon which the ultrasonic beam converges coincides with the center of curvature of the curve of the outline of the cross section of the subject at the scan position, receives the resulting reflected beam, and estimates the length of a flaw in the circumferential direction of the subject. In addition, the estimated length of the flaw is corrected using a correction coefficient corresponding to the distance between the center of curvature of the reference scan position and the center of curvature of the scan position in the thickness direction of the subject.

Ultrasonic flaw detection device, ultrasonic flaw detection method, and ultrasonic flaw detection program

An ultrasonic testing device performs flaw detection on a stringer having an inner circumferential surface of a substantially rectangular shape closed in a transverse section. The ultrasonic testing device includes: a shoe configured to be in contact with a corner of the inner circumferential surface of the stringer; an ultrasonic array configured to be fixed to the shoe to define, together with the shoe and the corner a medium space in which a contact medium used for propagating an ultrasonic wave is enclosed, and configured to transmit an ultrasonic wave to the corner and receive a reflected ultrasonic wave; and a forcing unit configured to be in contact with a corner and push the shoe against the corner.

Ultrasonic testing device and testing method

In an artificial defect materialof an FRP structure, a heat-resistant high-linear-expansion materialarranged between the layers thermally expands in case of high-temperature shaping of the FRP structure, so that a predetermined shape is shaped between a plurality of layers of the fiber reinforcing base materialand the materialthermally shrinks at the room temperature after the shaping, so that a space is formed due to the shrinkage difference from the fiber reinforcing base materials. The materialhas a linear expansion coefficient larger than that of the FRP structure by a predetermined value or more, and has the shape keeping property and the heat resistance to endure the shaping temperature.

Artificial defect material and manufacturing method of FRP structure

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Tokyo, Japan

Takahito Shimomukai