Title: A study of mechanical and thermal properties of materials in electronic packaging: application of micro DIC

Authors: Dongsheng Zhang, Chenglin Lu, Peng Lu, Dwayne Arola

Addresses: Department of Mechanics, Shanghai University, Shanghai 200444, PR China. ' Shanghai Institute of Applied Mathematics and Mechanics, Shanghai 200072, PR China. ' Shanghai Marin Diesel Engine Research Institute, Shanghai 200090, PR China. ' Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD 21250, USA

Abstract: The mechanical and thermal properties of materials used in electronic packaging are of significant importance. This paper presents a novel application of Digital Image Correlation (DIC) to characterise the properties of polymeric films and solder joints used in electronic packaging. A miniature loading frame and a thermal chamber were designed to load the film and solder samples, respectively. The mechanical properties (Elastic Modulus and Poisson|s ratio) of the polymeric film were estimated under uniaxial tension, while the thermal expansion of a solder ball was evaluated in a temperature chamber. Digital images of the samples were documented with a microscopic imaging system and DIC was used to evaluate the in-plane deformation. An algorithm that combined the subpixel technique, displacement fitting and correction of lens aberration was developed to improve the precision of the measurements. Results show that micro DIC is an easy-to-use technique and has strong potential as a characterisation methodology for materials and structures in electronic packaging.

Keywords: micro DIC; digital image correlation; mechanical properties; thermal properties; polymeric films; solder joints; electronic packaging.

DOI: 10.1504/IJMPT.2009.022413

International Journal of Materials and Product Technology, 2009 Vol.34 No.1/2, pp.200 - 213

Published online: 04 Jan 2009 *

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