Non-destructive characterisation of alumina/aluminium titanate composites using a micromechanical model and ultrasonic determinations: Part II. Evaluation of microcracking
作者： M.G. Hernández , S. Bueno , T. Sánchez , J.J. Anaya , C. Baudín
DOI: 10.1016/J.CERAMINT.2006.09.007
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摘要: Abstract A method for non-destructive detection of microcracks in ceramic composites is described. The involves the combination ultrasound characterisation with application a three-phase micromechanical model, which considers cracks and pores as void constituents. Four alumina-aluminium titanate materials different levels microcracking, from no (monophase alumina) to severely cracked (alumina + 40 vol.% aluminium titanate) including an alumina + 10 vol.% material incipient microcracking have been developed test validity method. Specimens fabricated by colloidal processing longitudinal transverse velocities determined ultrasonic pulse-echo transmission ultrasound-immersion techniques, employing digital signal processing. It has demonstrated that it possible differentiate between microcracks, both modelled constituents, terms aspect ratio.
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