ABSTRACT
<p><b>OBJECTIVE</b>To evaluate the usage of moiré interferometre in porcelain-fused-metal interfacial fracture mechanics.</p><p><b>METHODS</b>Raster was produced on the surface of samples with different thickness of porcelain and metal in 5 groups. The stripes of u field and v field under different load were collected. Then the rupture tenacity Jc was calculated and the extensions of flaws were observed.</p><p><b>RESULTS</b>Stress concentration appeared around the flaws under load conditions. The stripe became denser under more load. The rupture tenacity Jc and the direction of flaw extension of each group were different.</p><p><b>CONCLUSION</b>Moiré interferometre can be used in the study of porcelain-fused-metal interfacial fracture mechanics and to prognosticate the direction of flaw extension.</p>