Kobe Steel, Ltd.

Tatsuhiko Kabutomori

Mariko Matsuda

Hiroyuki Takamatsu

Toshihide Fukui

Hitomi Adachi

Ryota Yakura

A measurement system according to an aspect of the present invention enables measurement of an intensity distribution of diffracted X-rays obtained by irradiating a fillet portion of a metallic structure with X-rays, the metallic structure comprising: an axis portion; and a flange portion protruding radially from the axis portion, wherein the metallic structure comprises the fillet portion in a connection portion between the axis portion and the flange portion, the measurement system including: a diffracted X-rays measurement device provided with an irradiation unit that irradiates the fillet portion with X-rays; and a positioning device that positions the diffracted X-rays measurement device with respect to the fillet portion, in which the positioning device including: a moving mechanism that moves three-dimensionally the diffracted X-rays measurement device relative to the fillet portion; and a rotation mechanism that rotates the diffracted X-rays measurement device in such a direction that an angle of incidence of the X-rays with respect to the fillet portion is changed.

Measurement system and measurement method

A method measuring a residual stress of a fillet portion, where an angle of incidence of X-rays denoted by Ψ [°], a fillet radius denoted by R [mm], a fillet angle denoted by θ [°], a vertical width of a housing of an X-ray stress measuring apparatus denoted by W [mm], a width of a detection region of a two-dimensional detector denoted by D [mm], a complementary angle of a Bragg angle denoted by η [°], and an interval between a flange portion and an imaginary straight line which passes through a fillet center and is parallel to the flange portion denoted by a [mm], formula 1 is satisfied; when Ψ≥0, an irradiation distance L [mm] of the X-rays, the irradiation distance L satisfies formula 2; and when Ψ<0, the irradiation distance L satisfies formula 3.  1

Method for measuring residual stress

A method for measuring the stress of a concave section of a test subject which comprises a metal and has a surface and a concave section, the method including: a detection step for detecting, using a two-dimensional detector, a diffraction ring of diffracted X-rays which is formed by causing X-rays to be incident on the concave section and to be diffracted by the concave section; and a calculation step for calculating the stress of the concave section on the basis of the detection results during the detection step. Therein, the detection step involves causing X-rays to be incident on each of a plurality of sites inside the concave section of the test subject, and detecting, using a two-dimensional detector, the diffraction ring formed by the diffraction of the X-rays by the concave section.

Method for measuring stress

A method that measures stress of a test subject including a metal includes: detecting, using a two-dimensional detector, a diffraction ring of diffracted X-rays which is formed by causing X-rays from an irradiation unit to be incident on the test subject and to be diffracted by the test subject; and calculating the stress of the test subject based on detection results during the detection step. Therein, the detection step involves causing X-rays from the irradiation unit to be incident on each of a plurality of sites on the test subject with the irradiation unit angled relative to the test subject in a manner such that the angle of incidence on the test subject is within the range of 5-20&#xb0;, inclusive, and detecting, using a two-dimensional detector, the diffraction ring formed by the diffraction of the X-rays by the test subject.

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Takasago, Japan

Tatsuhiko Kabutomori