Estimating Residual Stress Value by Vickers Indentation in Zirconia Ceramics
Tarou TOKUDA and Mitsuo KIDO
Abstract:For measuring the residual stress on ceramics, X-ray method is frequently used, but Vickers indentation method (ID method) is also as it can be applied easily. Recently, this method was adopted as a standard test method by the Society of Materials Science, Japan (JSMS-SD-4-01), but it is not recommended for materials that induced transformation occurs during processing. ID method can be applied on Al2O3 and Si3N ceramics, and the authors reported the precise test conditions for these materials. In this study, ID method was applied for estimating the residual stress on ZrO2 ceramics, which shows phase transforma-tion by stress. SiC was tested for reference. The residual stress value obtained by ID method on ZrO2 was close to the value by X-ray method, when the indentation load was 294N. For estimating the residual stress on ZrO2 by ID method, the influ-ence of the phase transformation by the indentation shall be added onto the original residual stress, when the indentation small. The influence became smaller when the indentation load was large. It was found that ID method is effective for esti-mating the residual stress on ZrO2 ceramics, if the applied indentation load is between 294N and 490N. Key Words:Ceramics, Residual stress, Fracture toughness, Vickers indentation, X-ray diffraction, ZrO2