日本金属学会誌

J. Japan Inst. Metals, Vol. 48, No. 3 (1984),
pp. 248-255

A Study on Transient Behavior of Fiber Fracture in Cu-W Composites by means of Acoustic Emission Source Characterization

Takanori Ohira1, Teruo Kishi1, Hirohito Miyashita2, Yutaka Kagawa3 and Eiichi Nakata4

1Faculty of Engineering, The University of Tokyo, Tokyo
2Graduate Student, Waseda University, Tokyo. Present address: Nippon Mining Co., Ltd., Kurami, Kanagawa
3The Castings Research Laboratory, Waseda University, Tokyo
4School of Science and Engineering, Waseda University, Tokyo

Abstract:

Acoustic emission source characterization was applied to the study of fiber fracture processes in Cu-W composites. The source function was formulated as the time history of the product of cross section area, Δ A, distance between fracture surfaces, φ (t) and elastic modulus of tungsten fiber, from which φ (t) was determined since Δ A and elastic modulus could be regarded as constants. Using this method, it was shown that φ (t) reached its final value φ 0 of 29~61 μm within 1.1~2.1 μs after fiber fracture, and φ 0 agreed well with that from direct observation. Furthermore the initial velocity of fractured fiber φ (0)/2 was remarkably consistent with that calculated from the one-dimensional elastic fracture model of tungsten fiber.


(Received 1983/09/19)

Keywords:

fiber reinforced composites, acoustic emission source characterization, copper matrix, tungsten fiber


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