UNIVERSAL SPECIMEN FOR REGISTRATION OF ACOUSTIC-EMISSION IN MECHANICAL TESTS WITH CHANGE IN SIGN OF LOADING

We have developed a universal specimen construction allowing us to reg ister acoustic emission with different loading programs (tension, comp ression) without remounting the specimen. Extraneous acoustic noise wh ich inevitably arises in the bearing surface zone on loading the speci mens in the macroelastic region is eliminated as a result of changing the construction of the specimen and rigidly securing the threaded end s in the grips of the testing machine. We present the results of deter mination of the mechanical properties (sigma(i)(AE), sigma(max)(AE), s igma(0.2)) and examples of the acoustic emission diagrams obtained wit h different loading programs using specimens of this construction.