科研之友
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摘要
This paper conducts a preliminary study on the characteristic precursors of strong fractures occurred in the process before failure of brittle material specimens based on experimental results. First, strong fracture is defined by sudden variation of strain at some points and limited amplitude of wave recorded at some stations, and then the precursory characteristics are summarized before several strong fractures for various samples during two ways of loading, one kind of precursors is related to strain variation at specific points and the character of strain field, and another is the variation of acoustic emission features including AEs rate, b-value, spectrum and the variation of distribution of microcracks with time and space. In addition there are sudden strain and electromagnetic disturbances. However these precursors do not necessarily all emerge or at the same time, and nor they could be observed at all points and in any direction before a strong fracture for various samples of different materials. It should also be pointed out that there are no systematic studies on the precursors of many strong fractures in the process before failure. These show the difficulties of studying the precursor of fracture. Nevertheless it could be more meaningful for earthquake prediction. We appeal to further study the precursor characteristics of strong fractures.
- 出版日期2011-9
- 单位云南省地震局
