Residual stress determination on lithium disilicate glass-ceramic by nanoindentation

• Published in: Journal of non-crystalline solids Vol. 348; no. Complete; pp. 139 - 143
• Main Authors: Soares, P.C., Lepienski, C.M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15-11-2004; Elsevier
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fatigue, brittleness, fracture, and cracks; Materials science; Materials testing; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Methods of materials testing and analysis; Physics; 62.20.Mk; 81.05.Pj; G160; S410; Crystalline phase; Inorganic compounds; Crystallization; Nanoindentation; Glass; Measuring methods; Residual stresses; Lithium silicates; Crack propagation; Tensile stress; Stress determination; Stress effects; Glass ceramics
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2004.08.139

A recently developed method for measuring residual stresses around crystals embedded in the glass matrix, using nanoindentation with cube corner indenter, was used in a lithium disilicate glass-ceramic. We observed that there is a tangential tensile stress at the edge of the crystals that opens and propagates the crack in a direction normal to crystal surfaces. The residual stresses around the crystals are concentrated in the region at distances smaller than 100μm from the crystal surfaces. At greater distances the stresses are smaller. The limitations and improvements to the method are discussed.