Simulation of AE Generation Behavior in 2-Dimensional Polycrystals by Using the Body Force Method

• KIM Byung-Nam

  Department of Mechanical Engineering, Tokyo Metropolitan University

• NAITOH Hidehumi

  Graduate Student, Tokyo Metropolitan University

• WAKAYAMA Shuichi

  Department of Mechanical Engineering, Tokyo Metropolitan University

抄録

AE (Acoustic Emission) generation behavior during microfracture process of 2-dimensional alumina polycrystals is simulated along with its characteristic parameters, by assuming that a microfracture corresponds to an AE event. The microfracture process is simulated by using the body force method. Various AE generation behaviors are predicted as a function of the grain boundary toughness (K_<cb>), the grain size and the distribution state of residual stresses due to crystalline anisotropy. The predicted AE events have a tendency to occur at higher stress with increasing K_<cb> and with decreasing grain size. By the fracture-mechanical calculation of the crack opening volume, the relative variation of AE amplitude is also simulated. The actual AE measurements are tarried out in vacuum for two kinds of alumina with different grain size, and compared with the simulated results. The cumulative AE event curve for 11.5 μm grain size shows good agreement with the simulation when the K_<cb> is 0.35 times the grain toughness (K_<cg>), and that for 28.2 μm shows good agreement with the simulation at K_<cb> = 0.45K_<cg>. The results of AE location for both the simulation and the measurement show the similar characteristics of the scattered distribution over the stressed fields.

収録刊行物

• JSME international journal. Ser. A, Mechanics and material engineering

  JSME international journal. Ser. A, Mechanics and material engineering 39 (4), 633-639, 1995-10-01

  一般社団法人日本機械学会

キーワード

• Acoustic Emission
• Fracture Toughness
• Ceramics
• Grain Size
• Body Force Method
• Polycrystal
• Microfracture
• Grain Boundary
• Crack Opening Volume

詳細情報

• CRID: 1570854177181095168
• NII論文ID: 110002964507
• NII書誌ID: AA10888746
• ISSN: 09148809
• 本文言語コード: en
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