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The Signal Characteristics from Crack of Brittle Materials by Vickers Load  

Nam, Ki-Woo (Division of Materials Science and Engineering Pukyong National University)
Kim, Hyun-Soo (Division of Materials Science and Engineering Pukyong National University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.22, no.2, 2002 , pp. 125-131 More about this Journal
Abstract
we analyzed acoustic emission signals obtained from three kinds of brittle materials under compression load by Vickers hardness tester. The results obtained can be summarized as follows; The signal in each material could be divided into three signal based on the properties of load. All specimens were not detected acoustic emission signals in stage II which was load constant region., and were detected in stage I and stage III. Glass was detected high amplitude signals in stage III. $Al_2O_3\;and\;Al_2O_3/Sic$ were detected high amplitude signals in stage I.
Keywords
median crack; brittle materials; a acoustic emission; microcrack; signal characteristic;
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