Alam, M.O., Lu, Hua ORCID: https://orcid.org/0000-0002-4392-6562, Bailey, Christopher ORCID: https://orcid.org/0000-0002-9438-3879 and Chan, Y.C. (2008) Fracture mechanics analysis of cracks in solder joint intermetallic compounds. In: 2nd Electronics System-Integration Technology Conference, 2008. ESTC 2008. Institute of Electrical and Electronics Engineers, Inc., Piscataway, NJ, USA, pp. 757-762. ISBN 978-1-4244-2813-7 (doi:10.1109/ESTC.2008.4684445)

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Abstract

The trend towards miniaturization of electronic products leads to the need for very small sized solder joints. Therefore, there is a higher reliability risk that too large a fraction of solder joints will transform into Intermetallic Compounds (IMCs) at the solder interface. In this paper, fracture mechanics study of the IMC layer for SnPb and Pb-free solder joints was carried out using finite element numerical computer modelling method. It is assumed that only one crack is present in the IMC layer. Linear Elastic Fracture Mechanics (LEFM) approach is used for parametric study of the Stress Intensity Factors (SIF, KI and KII), at the predefined crack in the IMC layer of solder butt joint tensile sample. Contrary to intuition, it is revealed that a thicker IMC layer in fact increases the reliability of solder joint for a cracked IMC. Value of KI and KII are found to decrease with the location of the crack further away from the solder interfaces while other parameters are constant. Solder thickness and strain rate were also found to have a significant influence on the SIF values. It has been found that soft solder matrix generates non-uniform plastic deformation across the solder-IMC interface near the crack tip that is responsible to obtain higher KI and KII.

Item Type:	Conference Proceedings
Title of Proceedings:	2nd Electronics System-Integration Technology Conference, 2008. ESTC 2008
Additional Information:	This paper was presented at 2nd Electronics System-Integration Technology Conference, 2008 (ESTC 2008), held from 1-4 September 2008, in Greenwich, London, UK. The event was organised by the Computational Mechanics and Reliability Group of the University of Greenwich and the UK and RI Chapter of IEEE Components, Packaging and Manufacturing Technology (CPMT) Society with additional input from the IEEE and iMAPS Europe and programme sponsorship from the Innovative Electronics Manufacturing Research Centre (IeMRC). ©2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
Uncontrolled Keywords:	solder joint, intermetallic compound, fracture mechanics
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering Q Science > QA Mathematics
Pre-2014 Departments:	School of Computing & Mathematical Sciences School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Mechanics & Reliability Group School of Computing & Mathematical Sciences > Department of Computer Systems Technology School of Computing & Mathematical Sciences > Department of Mathematical Sciences
Related URLs:	Publisher Organisation Organisation
Last Modified:	20 Mar 2019 11:54
URI:	http://gala.gre.ac.uk/id/eprint/1227

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