Deformation analysis of lap-shear testing of solder joints

Y. L. Shen, Nikhilesh Chawla, E. S. Ege, X. Deng

Research output: Contribution to journalArticle

67 Scopus citations

Abstract

A combined numerical and experimental study of lap-shear testing of solder joints was carried out. The primary objective was to provide a quantitative evaluation of shear deformation experienced by the solder. The numerical analysis was based on finite element modeling of deformation in the substrate-solder assembly. The calculated shear response, utilizing both the commonly adopted far-field measurements and the actual shear strain in solder, was found to differ significantly. The geometric and material parameters during lap shear were explored to provide physical insight into the problem. The nature of deformation of the substrate was seen to greatly influence the shear behavior of the solder. The "transmission" of shear strain into the solder is very ineffective when the solder is in the elastic state, resulting in smaller shear strains in the solder than the nominal values. This effect is also true even when the solder is deforming plastically. Experimental measurements of solder shear using direct optical measurements confirmed the numerical findings. Subtraction of the average deformation of the Cu substrate provides a reasonable, albeit not complete, approximation of the solder strain.

Original languageEnglish (US)
Pages (from-to)2633-2642
Number of pages10
JournalActa Materialia
Volume53
Issue number9
DOIs
StatePublished - May 1 2005

Keywords

  • Finite element analysis
  • Lap-shear testing
  • Mechanical properties
  • Solder

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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