Constitutive equations for strain rate and temperature dependent mechanical behaviour of porous Ag-sintered joints in electronic packages

Sintering of silver attracts increasing attention in electronic packaging owing to superior bonding quality and high operation temperatures. However, the mechanical properties sintered joints strongly depend on fabrication parameters like sintering temperature, pressure or organic solvents paste. In consequence, characterization this material is a challenging task. present article, unified constitutive equations for plasticity creep are established. Thereby, particular interest devoted influence porosity properties. The assumptions model validated by tests carried out with samples prepared under constant conditions. fitted test results performed tension mode, shear mode conditions stress relaxation. This implemented commercial software ABAQUS through user subroutines UMAT VUMAT. conclusion, can be used as prerequisite reliability predictions Ag-sintered packages.