Micro-Indentation Fracture Toughness Evaluation with a Novel Microscopy
Abstract:A novel microscopy is developed for evaluating the fracture toughness of thin ceramic sheets using the micro-indentation method. This microscopy overcomes the theoretical limit of measurement resolution associated with optical microscopes. Using a modified optical microscope, the crack lengths produced by micro-indentation on the surface of an as-fired ceramic sheet can now be measured. Experimental results on an 8 mol% yttria-stabilized zirconia ceramic substrate show that the accuracy of the fracture toughness evaluation is satisfactory. This micro-indentation fracture toughness evaluation method is efficient and economical for thin ceramic substrate surfaces, either polished or as-fired.
Document Type: Research Article
Affiliations: Department of Aerospace and Mechanical Engineering, The University of Arizona, Tucson, Arizona 85721
Publication date: 2005-06-01