Lead-Free Solder Cyclic Plasticity Characterization for Drop Test Simulations

Abstract

Mechanical behaviour of lead-free solder has been investigated experimentally and thereafter modelled analytically. Material test specimens subjected to uniaxial cyclic loadings at different strain rates exhibit noticeable properties: viscoplasticity, nonlinear mixed hardening within each cycle and hardening followed by softening between consecutive cycles. To accurately describe these behaviours, a modified Armstrong and Fredrick model was combined to the Perzyna viscoplastic evolution equation. The set of parameters was determined by both curve-fitting and use of analytical relations