Abstract
The aim of this study was to clarify the effects of micro surface defects introduced by the focused ion beam (FIB) technique on the fracture strength of ceramics. Three-point bending tests on alumina-silicon carbide (Al2O3/SiC) ceramic composites containing crack-like surface defects introduced by FIB were carried out. A surface defect with in the range 19 to 35 µm was introduced at the center of each specimen. Test results showed that the fracture strengths of the FIB-defect specimens depended on . The test results were evaluated using the evaluation equation of fracture strength based on the process zone size failure criterion and the parameter model. The experimental results indicate that FIB-induced defects can be used as small initial cracks for the fracture strength evaluation of ceramics. Moreover, the proposed equation was useful for the fracture strength evaluation of ceramics containing micro surface defects introduced by FIB.
Highlights
Ceramics have excellent mechanical, tribological, and thermal properties in comparison with metallic materials
The experimental results indicate that focused ion beam (FIB)-induced defects can be used as small initial cracks for the fracture strength evaluation of ceramics
The proposed equation was useful for the fracture strength evaluation of ceramics containing micro surface defects introduced by FIB
Summary
Tribological, and thermal properties in comparison with metallic materials. Ando et al proposed the process zone size failure criterion and reported that the fracture strength of ceramics containing small surface cracks could be evaluated by this criterion [7] This model can predict the fracture strength of a material having a semicircular crack introduced perpendicular to the tensile stress. We proposed a new evaluation equation for the fracture strength of ceramics combining the process zone size failure criterion and the area parameter model [11]. This equation is useful for the evaluation of fracture strength of ceramics having a surface crack with arbitrary shape and orientation introduced by the indentation method. Regarding the relationship between fracture strength and defect size, the consistencies of the test results and the values predicted by the proposed evaluation equation were verified
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