Abstract:
Small punch test is more and more used in the field of mechanical properties evaluation of nuclear materials because of the advantages of small sampleinduced radioactivity caused by the small size of the test sample required. In this paper, a set of small punch test device to directly measure the deformation of the sample using a grating ruler was designed, which has a significantly improved accuracy compared with the conventional device. Using this device, a small punch test was carried out on China A5083 steel with a fast neutron flux of 10×1019 cm-2(E≥1 MeV). The test method for preparation and testing of radioactive samples was explored and obtained. The relationship between the yield, tensile characteristic value and ductilebrittle transition temperature of the small punch of China A5083 steel material and the standard test was obtained.