Estimating uniaxial constitutive relationships of materials by using double-hardness indentation method

摘要

Based on elastoplastic finite element analyses, the relationships between the indentation energyratio and the plastic parameters of Hollomon constitutive model corresponding to the conicalindentation with included angles of 60u000e and 70.3u000e were proposed. Then, the equations of nominalhardness and Hollomon parameters with two angles were set up. A new way named double-hardnessindentation method be used to predict the uniaxial constitutive relationships of materials. Theconstitutive relationship could be obtained easily by double-hardness indentation method onlythrough local hardness of materials measured by two conical indentations. The new way can beapplied to get the mechanical properties of service component materials, welding area materialsand small sized materials. Considering double-hardness indentation, certifying experiments werecarried out for 304 stainless steels. The result showed that the uniaxial constitutive relationshippredicted by double-hardness indentation method is nearly consistent with test standard of uniaxialtensile result.