A study of the fracture of glasses, pyroceramics and their nanojoints using the method of acoustic emission

• DOI: 10.1007/s11223-007-0008-2
• Publication Date: 2007-04-04T16:44:39Z
• Authors: V. A. Strizhalo; Yu. V. Dobrovolskii; M. P. Zemtsov; V. P. Maslov; Yu. M. Rodichev; V. E. Bodunov
• Keywords: 01 natural sciences; 0104 chemical sciences

The optical systems operating under great ambient temperature drops use materials with special properties, e.g., with invariable geometric characteristics, such as Zerodur glass ceramic with zero coefficient of thermal expansion. Strong precision joints of parts are necessary elements of systems. Fracture processes in loaded materials are studied by the method of acoustic emission, which allows one to record the instant of crack initiation and to study crack development in a brittle material during loading. The evaluation of the strength of brittle optical materials and their nanojoints by the method of acoustic emission has been shown to have good prospects. It has been found that the number of acoustic emission pulses depends on specimen strength. In tests of nanojoints of pyroceramics, two characteristic fracture modes are possible: with crack propagation into the specimen material and without crack propagation beyond the seam limits. The method of acoustic emission assures reliable recording of these fracture modes.