1443 AE原波形解析を用いたセラミックスの微視破壊過程の解明(S07-1 セラミックスおよびセラミックス系複合材料I,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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Fracture toughness tests of notched bending specimens of alumina ceramics were carried out in air and water. During the test, stable crack propagation was observed, and AE signals emitted from microcracking were detected by piezoelectric transducers. Then AE source function which describes the nature of microcrack nucleation was also determined by inverse calculation using detected signal. Sizes and nucleation velocities of individual microcracks could be determined from the source functions. For tests in air, radius was 7.1-42.6μm, while it was 8.1-43.5μm in water. Cumulative AE event was less in water than in air. Fracture resistance was also lower in water than in air. In addition, The size of coalescing cracks observed on fracture surface by SEM was in good agreement with the result of AE source characterization.
一般社団法人日本機械学会の論文
2008-08-02