Loading direction versus crack propagation path in a lead-free single solder joint sample

Feng Gao, Jianping Jing, Janine Johnson, Frank Z. Liang, Richard L. Williams, Jianmin Qu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this paper, single solder joints (SSJs) were subjected to moderate speed loading (5mm/sec) in different directions, from pure tensile, mixed mode to pure shear. Fracture surfaces from different loading directions were examined both experimentally and numerically. It is observed that intermetallic compound (IMC) is formed between the solder alloy and the Cu pad, and failure typically occurs at or near the solder/lMC/Cu interfaces on the board side. Pure tensile loading typically leads to interfacial fracture along the IMC/Cu interface. Mixed mode loading usually results in a mixture of interfacial and cohesive failure with crack propagating in a zigzag fashion between the solder/IMC interface and the solder alloy. Loading with higher shear component tends to result in more cohesive failure of the solder alloy near the solder/IMC interface. Under pure shear loading, failure is almost always cohesive within the solder alloy near the solder/IMC interface.

Original languageEnglish
Title of host publicationElectronics and Photonics
Pages145-152
Number of pages8
DOIs
StatePublished - 2009
Event2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008 - Boston, MA, United States
Duration: 31 Oct 20086 Nov 2008

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings
Volume6

Conference

Conference2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008
Country/TerritoryUnited States
CityBoston, MA
Period31/10/086/11/08

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