An Assessment of the Elongation of Fractured Specimen Subjected to Tensile Testing Based on Small Punch Testing
小冲杆试验确定材料拉伸断后伸长率的研究

Small Punch Test(SPT) with miniature specimen is a new technique applied to non-destructive evaluation of material mechanical properties.SPT was performed for dozens of materials to investigate the relationship between the axial deflection δ of SPT specimen and the elongation A of the fractured specimen subjected to tensile testing.Experimental results show that there is not a linear relation between δ and A for tested dozens of materials.But according to the ultimate tensile strength and yield-strength ratio,above-mentioned materials can be divided into different groups.Then the axial deflection δ of SPT can be linearly correlated to the A of the fractured specimen subjected to tensile testing in each group respectively.For materials,whose ultimate tensile strength is less than 600MPa,two groups can be devided according to the yield-strength ratio 0.67.A linear empirical correlation formula was proposed for each of group.No obvious correlation was found for materials whose ultimate tensile strength is larger than 600MPa,due to data insufficiency.