Study of plasticity damage mechanics constitutive model for SnAgCu solder joint

A thermodynamics-based damage mechanics rate dependent constitutive model is used to simulate experiments conducted on thin layer eutectic SnAgCu(SAC) solder joints. The non-damage constitutive is measured by bulk tensile test. The relationship between true stress and strain is σ=85.26ε0.3536. Damage evolution equation is proposed based Lemaitre ductile damage theory and the constant in the equation is measured by unloading elastic modulus method. The damage evolution equation is D=1.0689εP-0.0008. Simulation (using software Ansys 9.0) of shear test of solder joint between Cu sticks employing damage mechanics rate independent constitutive is uniform to practicable test.