Skip navigation

Thermal-mechanical analysis of flexible substrates during lead-free solder reflow

Thermal-mechanical analysis of flexible substrates during lead-free solder reflow

Yin, Chunyan, Rizvi, M.J., Lu, Hua and Bailey, Christopher (2006) Thermal-mechanical analysis of flexible substrates during lead-free solder reflow. Proceedings of the 1st Electronics Systemintegration Technology Conference, 2006. IEEE, pp. 1007-1011. ISBN 1 4244 0552 1 (doi:10.1109/ESTC.2006.280134)

Full text not available from this repository.

Abstract

This paper presents modeling results about the performance of flexible substrates when subjected to higher lead-free reflow temperatures. Both adhesiveless and adhesive types of polyimide substrates were studied. Finite element (FE) models of flex substrates were built, two copper tracks located in the centre of the substrate was considered. The thermal induced shear stress in the flex substrate during the lead-free reflow process was studied and the effect of the design changes including the track thickness, flex thickness, and copper width were studied. For both types of flexes, the one of most important variables for minimizing damage to the substrate is the height of the copper tracks. The height of flex and the width of copper track show less impact. Beside of the geometry effects, the increase in reflow peak temperature can also result in a significant increase in the interfacial stress between the copper track and flex. Higher stresses were identified within the adhesive flex due to the big CTE mismatch between the copper and adhesive/dielectric

Item Type: Book Section
Additional Information: Paper originally presented at 1st Electronics Systemintegration Technology Conference, Dresden, Germany, 5-7 September 2006
Uncontrolled Keywords: flexible substrates, thermo-mechanical, lead free solder
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QA Mathematics
Pre-2014 Departments: School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis
School of Computing & Mathematical Sciences
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
School of Computing & Mathematical Sciences > Department of Computer Science
Related URLs:
Last Modified: 14 Oct 2016 09:02
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/1049

Actions (login required)

View Item View Item