This paper is part of an ongoing effort to develop a test methodology to examine the durability of surface mount interconnects under impact loading conditions. Literature indicates that as the drop height is increased, there is a transition in the failure site from the ductile solder to the brittle intermetallic. Not much work has been done to understand this phenomenon. This study considers damage accumulated in the interconnects in terms of the local strain in the printed wiring assembly (PWA), local strain rate and component acceleration. The advantage is that the results are less dependant on structure and loading, because damage is quantified in terms of specimen response rather than the loading. A simple test specimen is fabricated to concentrate the study on interconnect failure mechanisms. An instrumented, repeatable test setup is developed to conduct high speed bend tests and drop tests on the specimen. All tests are replicated twice for proof of consistency of the test data. The paper presents the results of the high speed bend tests. As expected, the durability of the specimen decreases monotonically with PWA strain. On the other hand, the durability first increases and then decreases as the PWA strain rate increases. Failure analysis shows a transition in the failure site from solder to intermetallic. It is hypothesized that for a given package design, the rate dependent material properties determine the partitioning of the strain energy of deformation. Yield stress of the solder and fracture toughness of the intermetallic are identified as the key parameters. More tests are needed to understand this rate dependent strain energy partitioning. The end goal is to develop a consistent, accurate and generic methodology for ranking the impact durability of different surface mount interconnects technologies.
Skip Nav Destination
ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference
July 17–22, 2005
San Francisco, California, USA
Conference Sponsors:
- Heat Transfer Division and Electronic and Photonic Packaging Division
ISBN:
0-7918-4200-2
PROCEEDINGS PAPER
Failure Site Transition During Drop Testing of Printed Wiring Assemblies Available to Purchase
J. Varghese,
J. Varghese
University of Maryland, College Park, MD
Search for other works by this author on:
A. Dasgupta
A. Dasgupta
University of Maryland, College Park, MD
Search for other works by this author on:
J. Varghese
University of Maryland, College Park, MD
A. Dasgupta
University of Maryland, College Park, MD
Paper No:
IPACK2005-73014, pp. 845-848; 4 pages
Published Online:
March 4, 2009
Citation
Varghese, J, & Dasgupta, A. "Failure Site Transition During Drop Testing of Printed Wiring Assemblies." Proceedings of the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems collocated with the ASME 2005 Heat Transfer Summer Conference. Advances in Electronic Packaging, Parts A, B, and C. San Francisco, California, USA. July 17–22, 2005. pp. 845-848. ASME. https://doi.org/10.1115/IPACK2005-73014
Download citation file:
8
Views
Related Proceedings Papers
Evaluation of Surface Finish on Build Up Substrate
InterPACK2003
Related Articles
Cracking of the Intermetallic Compound Layer in Solder Joints Under Drop Impact Loading
J. Electron. Packag (September,2011)
Behavior of Lead-Free Solder Under Thermomechanical Loading
J. Electron. Packag (September,2004)
Failure Analysis of Halogen-Free Printed Circuit Board Assembly Under Board-Level Drop Test
J. Electron. Packag (March,2012)
Related Chapters
Impact Testing
A Quick Guide to API 510 Certified Pressure Vessel Inspector Syllabus
Subsection NE — Class MC Components
Companion Guide to the ASME Boiler and Pressure Vessel Code, Volume 1, Third Edition
Subsection NE—Class MC Components
Companion Guide to the ASME Boiler & Pressure Vessel Code, Volume 1, Second Edition