STAIN GAUGE FOR STRESS INTENSITY FACTOR MEASUREMENT AND CALCULATION METHOD OF STRESS INTENSITY FACTOR

• Main Authors: YAMAJI SHUSAKU, KUROSAKI SHIGERU, KOBARI RYO
• Format: Patent
• Language: English; Japanese
• Published: 30.07.2015
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a strain gauge for stress intensity factor measurement which dispenses with complicated crack length measurement work, and facilitates measurement and calculation, and a calculation method of a stress intensity factor.SOLUTION: A strain gauge for stress intensity factor measurement has a reference axis which radially extends as an axial center O, a first radial axis OR which linearly extends orthogonal to the reference axis OX, a second radial axis OR which linearly extends orthogonal to the reference axis OX in its exactly-opposite direction, and fan-shaped four regions which are surrounded by a first circular part C1, a second circular part C2, a third circular part C3 and a fourth circular part C4 which are different in radii from the reference axis OX. First to fourth gauge grid parts G1 to G4 are pasted to the fan-shaped four regions. The strain gauge for stress intensity factor measurement is pasted to an object to be measured by making an axial center O coincide with a crack tip generated at the object to be measured, and making a direction of a cracked part and the reference axis OX coincide with each other. 【課題】 煩雑なき裂長さ測定作業が不要で、測定および計算を簡易にした応力拡大係数測定用ひずみゲージおよび応力拡大係数算出方法を提供する。【解決手段】 軸中心Ｏとして放射状に伸びる基準軸ＯＸと、基準軸ＯＸと直交して直線で延びる第１の放射軸ＯＲ１と、その正反対方向に基準軸ＯＸと直交して直線で延びる第２の放射軸ＯＲ２と、基準軸ＯＸからの半径が異なる第１の円弧部Ｃ１と第２の円弧部Ｃ２と第３の円弧部Ｃ３と第４の円弧部Ｃ４とで囲まれた扇型の４つの領域を有する。上記扇型の４つの領域には、第１〜第４のゲージグリッド部Ｇ１〜Ｇ４を備える。被測定対象に生じたき裂先端部に軸中心Ｏを合致させ且つ、き裂部の方向と基準軸ＯＸとを合致させて応力拡大係数測定用ひずみゲージを貼り付ける。【選択図】 図１