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1 Bulletin of the Polish Academy of Sciences. Technical Sciences

1 1999

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Properties of Ceramics Derived from Direct Observations of Crack

Librant Z., Boniecki M., Gładki A., Daszkiewicz M., Galas J., Rećko W.

Bulletin of the Polish Academy of Sciences. Technical Sciences

1999

Vol. 47, nr 4

365-377

A device was designed and constructed for direct observations of crack growth from notch or form Vickers indent made on the beam bent in a typical testing machine. The device, consisting of horizontal light microscope coupled with CCD camera, is fitted to ZWICK 1446 testing machine by the system of elevator stages driven by stepping motors. This enables precise movements of objective in x, y, z-direction, for adjustment, focusing and tracking on the beam side and bottom surface where the crack propagates. Measuring and registration picture system (framegrabber) is coupled with load and strain system of testing machine and both systems are aided by computer. Optical and electronic magnification is about to 250x. For the case of crack propagated in single-edge notched beam, directly measured crack length was compared with crack length calculated from compliance measurements.