Abstract
The small punch testing technique under quasi-static loading was examined in the view of punch eccentricity role. It might arise especially when the ball is used as the penetrating tool, instead of hemispherical-ended punch. The austenitic stainless steel AISI 316L was chosen to execute several various “large scale” tests in order to calibrate the multi-linear stress–strain relationship along with the ductile fracture criterion KHPS. All the calibration procedure was performed without using the small punch testing. Then, the model was applied to small punch tests to observe the prediction ability when compared to real small punch experiments. Consequently, a numerical study was conducted to see the role of eccentricity in the case of 2 and 2.5 mm ball diameters used as the penetrating tool. The magnitude of eccentricity up to 0.3 mm was numerically tested. The results showed negligible role of eccentricity for 2 mm ball diameter and minor role for 2.5 mm diameter and studied material.
Highlights
The small sample techniques have been evolved since the second half of the twentieth century [1,2] along with the development of more accurate measuring systems, which are capable of assessment of such miniaturized testing
The punch eccentricity effect was numerically studied by means of the finite element method
The material behavior was only isotropic homogeneous with associated flow rule obeying von Mises plasticity, which is dependent on the second invariant of deviatoric stress tensor
Summary
The small sample techniques have been evolved since the second half of the twentieth century [1,2] along with the development of more accurate measuring systems, which are capable of assessment of such miniaturized testing. The penetration test has several embodiments: the Small Punch Test (SPT); shear punch test; and disc bend test [3,4,5] These have been studied by scanning electron microscopy to reveal the changes in microstructure [6]. There is a shortage of material usable for testing in energy industry applications such as the turbine rotors or cases, pressure vessels and piping, or various components subjected to radiation in the primary circuit within the nuclear power plants [8]. Those facts open wide possibilities in miniaturized testing
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