Abstract
In this article, a new method has been presented for the estimation of fracture toughness in brittle materials, which enjoys improved accuracy and reduced costs associated with fracture toughness testing procedure compared to similar previous methods, because a vast range of specimens with irregular cracks can be accommodated for testing. Micron-sized alumina powders containing 0.05 wt% magnesium oxide (MgO) nanoparticles were mixed and also together with 2.5 vol%, 5 vol%, 7.5 vol%, 10 vol%, and 15 vol% of silicon carbide (SiC) nanopowders separately. By making and testing various types of ceramics with different mechanical properties, and considering the irregular cracks around the indented area caused by Vickers diamond indenter, a semi-empirical fracture toughness equation has been obtained.
Highlights
Different methods have been devised for the measurement of fracture toughness in brittle materials
Fracture toughness values have been measured for four times in single-edge V-notched beam (SEVNB) and single-edge notch beam (SENB) methods, and three times in Chevron notch bar (CNB) method
Data corresponding to No 11 on the horizontal axis are fracture toughness values according to Eq (8), and the values listed in Table 5 for SENB and SEVNB methods are given in the end portion of the horizontal axis for different percentages of silicon carbide (SiC) nanopowder
Summary
Different methods have been devised for the measurement of fracture toughness in brittle materials. The idea of obtaining fracture toughness in brittle materials by evaluating the effect of indenter was first developed by Palmqvist [12]. By applying Vickers hardness-testing diamond in metal carbides, Palmqvist was able to establish a relationship between fracture process and other important parameters, such as hardness [14]. Many other researchers followed along and developed several relations for the estimation of this mechanical property [15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]. A method, which increases the accuracy and reduces the costs of performing fracture toughness test based on Vickers indenter, has been investigated. With numerous industrial applications, has been used as the main raw material together with 0.05 wt% of magnesium oxide (MgO) and various amounts of silicon carbide (SiC) nanopowder, which considerably changes its mechanical properties
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