Location of acoustic emission of ceramics fracturing

AE (acoustic emission) parameter analysis method is considered in the research on ceramics fracturing, but the position of cracks in ceramics is impossible to be located using the method. The initial value selection of Geiger algorithm is optimized. The algorithm is verified by 2-dimensional and 3-dimensional location experiments, and the location accuracy is analyzed according to the experimental results. The average location error of acoustic emission source on a 200 mm×200 mm2 flat plate is 1.641 mm, and that on a 50 mm×50 mm×100 mm cube is 3.47 mm. The reasons of the error mainly include the properties of material, the accuracy of acoustic emission testing system and the location algorithm. Lots of microcracks occur and grow in a typical brittle material, such as ceramics, during loading, resulting in acoustic emission (AE). Through the compression test and 3-dimensional locating detection of AD95(95%) alumina ceramic specimens, the acoustic emission characteristics are achieved and the positions of cracks are located by the optimized Geiger algorithm. The location result is in accordance with the actual fracture position, and the formation and propagation of cracks in ceramics can be analyzed by the method. ©, 2014, China Ordnance Society. All right reserved.