A nonlinear fracture mechanics approach to modeling fatigue crack growth in solder joints

D. Bhate, D. Chan, G. Subbarayan, L. Nguyen

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Predicting the fatigue life of solder interconnections is a challenge due to the complex nonlinear behavior of solder alloys and the importance of the load history. Long experience with Sn-Pb solder alloys together with empirical fatigue life models such as the Coffin-Manson rule have helped us identify reliable choices among package design alternatives. However, for the currently popular Pb-free choice of SnAgCu solder joints, designing accelerated thermal cycling tests and estimating the fatigue life are challenged by the significantly different creep behavior relative to Sn-Pb alloys. In this paper, a hybrid fatigue modeling approach inspired by nonlinear fracture mechanics is developed to predict the crack trajectory and fatigue life of a solder interconnection. The model is shown to be similar to well accepted cohesive zone models in its theoretical development and application and is anticipated to be computationally more efficient compared to cohesive zone models in a finite element setting. The approach goes beyond empirical modeling in accurately predicting crack trajectories and is validated against experiments performed on lead-free as well as Sn-Pb solder joint containing microelectronic packages. Material parameters relevant to the model are estimated via a coupled experimental and numerical technique.

Original languageEnglish (US)
Pages (from-to)210031-210039
Number of pages9
JournalJournal of Electronic Packaging, Transactions of the ASME
Issue number2
StatePublished - Jun 2008
Externally publishedYes


  • Acceleration factors
  • Cohesive zone modeling
  • Lead-free solder

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials
  • Computer Science Applications
  • Electrical and Electronic Engineering


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