Abstract
This research presents a practicable method to investigate the characteristics of the microcrack growth in brittle materials. The crack length measurement method using an ion-sputtered film was applied to measure the length of the microcrack growing in soda-lime glass and alumina ceramics in four-point bending tests. Since the measurement system can measure the crack length at a sampling frequency of 125 kHz, the crack length was measured almost continually, and the relation-ship between the crack growth rate and the stress intensity factor was obtained in the whole regions from low crack growth rate to brittle fracture. If the relationship between crack growth rate and stress intensity factor follows the Paris law, the n values of the soda-lime glass and alumina ceramics are obtained in the region I and region II that are very important to the fatigue life estimation for these materials.
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