COST MP0602 Expression of Interest

1
COST MP0602Expression of Interest

• Thermo-mechanical behavior of Pb-free solder
  joints scale, constraining microstructural
  effects

2
Approach
For 1 alloy substrate combination
Mechanical modelling ( FEM)
Macro mechanical model Elasto-VISCO-plasticity
damage failure
Direct inverse homogenization
Micro mechanical model Elasto-VISCO-plasticity
damage failure of phases / grains /
interfaces
3
Goals

• Full thermo-mechanical characterization
  modelling of HT Pb-free joints ( one alloy /
  substrate ) with respect to
• Size geometry (gt constraints)
• Thermo-mechanical history
• Microstructure
• Develop methods / models to
• Relate micro-structural changes with macro-level
  behaviour
• Characterize visco-plastic mechanical properties
  at the macro micro level
• Constitutive models of interfaces (IMC layer)

4
Expertise collaboration

• Expertise
• Numerical simulation in thermo-mechanics
• Constitutive modelling / homogenization
• Fracture mechanics fatigue
• Mechanical testing Optical strain measurement
  (DIC)
• Dynamic testing shock vibration
• Inverse num.-exp. characterization procedures
• Collaboration
• Need expertise in experimental / theoretical
  material science
• Alloy selection
• Phase diagram / modelling
• Diffusion processes microstructure analysis /
  prediction
• (Alloy preparation joint manufacturing)
• Any other contribution / collaboration is welcome