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Influence of crack initiation, propagation and coalescence on load in fatigue test at elevated temperature

高温疲労試験におけるき裂の発生・進展・結合と荷重への影響

Bubphachot, B.*; 渡部 修*; 川崎 信史 ; 笠原 直人

Bubphachot, B.*; Watanabe, Osamu*; Kawasaki, Nobuchika; Kasahara, Naoto

有孔平板の高温疲労におけるき裂の発生と進展がCCDカメラにより観察された。試験片はSUS304製であり、55$$^{circ}$$Cの疲労試験を実施した。なお、有孔平板は孔径をパラメータとして製作している。き裂に発生を観察するため、各サイクルの画像データが取得された。試験結果は、応力再配分軌跡法(SRL法)とノイバー則によって比較検討された。

Crack initiation and propagation were observed on perforated plates at elevated temperature by the CCD video camera. The test specimens are made of SUS304 stainless steel, and temperature is kept to be 550$$^{circ}$$C, and the geometry of the perforated plate specimens are changed by diameter size of the hole. The photographs of all cycles were recorded to obtain number of cycle of crack initiation (${it N$_{c}$}$). The results were compared with predictions by the stress redistribution locus (SRL) method and the Neuber's rule's method.

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