Evaluation of Fracture Toughness Using Small Punch Test for Aluminum 6061-T6 Type-3 Cylinder Liner

Abstract

-Type-3 cylinder liner has a limitation of machining the standard specimen for fracture toughness test because it has approximately 5 mm in thickness as well as a curvature. Hence, it needs to be employed a miniature specimen test technique to evaluate fracture toughness of the cylinder liner.In this study, small punch (SP) test method was employed to evaluate fracture toughness of the cylinder liner. Load-displacement curve result measured from the SP test showed that the liner material was failed during membrane stretching in the general SP load-displacement curve. Additionally, it was shown that liner material was isotropic although the amount of plastic deformation was different depending on the direction due to manufacturing process characteristics. Fracture toughness,   , was evaluated using the SP test data. The value of fracture toughness obtained was 13.0 kJ/m 2 . This value was similar to that of the same kind of materials. Therefore, the fracture toughness evaluated using the SP test data was reasonable.