Fatigue crack initiation in solder joints

Z. Zhang, Daping Yao, L. K. Shang

Research output: Contribution to journalArticlepeer-review


A backface strain technique is introduced to examine fatigue crack initiation in solder lap joints. The technique detects the fatigue crack initiation by monitoring the backface strain at the end of the overlap. Variation of the backface strain with the development of a crack was simulated by finite element method. The simulation indicated that the backface strahz at the end of the overlap reached a peak value when a fatigue crack initiated. Experimental verification was carried out in 63Sn-37Pb solder joints. The backface strain was recorded as a function of stress cycle to demonstrate the applicability of this technique. Experimental results showed that fatigue crack initiation took about half of the fatigue lifetime of the solder joints.

Original languageEnglish (US)
Pages (from-to)41-44
Number of pages4
JournalJournal of Electronic Packaging, Transactions of the ASME
Issue number2
StatePublished - Jun 1996
Externally publishedYes

ASJC Scopus subject areas

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


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