OS0311 AE法を用いた減肉を有するエルボ配管の低サイクル疲労におけるき裂の進展過程の解析(OS3-3 AE・超音波・赤外線,OS-3 非破壊評価と構造モニタリング1)

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  • OS0311 Crack propagation analysis by means of AE method under low cycle fatigue of elbow pipe having local wall thinning

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This paper describes Acoustic Emission (AE) measurement used to assess the fatigue life and failure mode of piping with local wall thinning subjected to seismic loading. Local wall thinning by erosion/corrosion was simulated by machined pipe wall tinning. Low cycle fatigue tests for the pipes were then carried out. Furthermore, AE method during low cycle fatigue tests was employed to evaluate the crack initiation and propagation. As a result, AE was detected when the tensile stress applied to the tip of the crack, and was drastically incased at the fatigue life cycle. Based on Miner's law, authors discussed about AE behaviors due to fatigue damage.

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