21311 サーメットの微視破壊過程における微視損傷のAE法による検出(材料強度と構造設(1),OS.5 材料強度と構造設計)

概要

論文の詳細を見る
The 4-point bending tests were carried out and microfracture process in cermet was characterized by acoustic emission (AE) technique. During the test, rapid increase in cumulative AE energy prior to the final fracture was observed, which could be related with the maincrack formation using AE source location. Furthermore, AE wavelet analysis was performed to characterize the signals and the results suggested that there were two types of AE; one is the burst-type signal with high frequency and the other is continuous-type signal with low frequency. Considering their natures, the former could be related with microcrack nucleation or propagation, and later with plastic deformation of binder phase. In addition, the relationship between the critical stress for maincrack formation and preexisting-defect size was investigated, and it was found that the crack initiated from the defect at the rapid increasing point of cumulative AE energy.
2009-03-05