Journal of SMT Article
DEVELOPMENT AND APPLICATION OF A PRESS-PIN/PTH RELIABILITY MODEL
Company: Hewlett Packard Company
Date Published: 7/1/2002 Volume: 15-3
Many researchers have been studying mechanical and electrical reliability of PP/PTH interconnection [1,2,3]. The research tools varied from experimental testing to finite element (FE) numerical model development [3,4,5]. Most of the published literature on PP/PTH studies uses two-dimensional (2D) FE models that are limited and simplified, not fully capturing the interaction physics . Developing a three-dimensional (3D) model could be more accurate in predicting their interactions and reliability, as the PP/PTH assembly is inherently 3D in nature .
A team composed of Georgia Institute of Technology and Hewlett Packard Company personnel has developed a 3D FE model of the PP/PTH assembly as a joint venture over the past few years. In this work, a combined numerical and experimental program addresses some of the design challenges including complex geometry, PTH sizes, and material non-linearities. Analytically, a parametric model was developed in ANSYS. Experimentally, two different types of pins have been assessed for reliability under three different PTH surface finishes and three different drilled-hole-sizes (DHS).
This model can be used to make design decisions involving:
This paper will explain, in detail, construction of the 3D PP/PTH model, the model physics, experimental validations conducted, and the results obtained. And finally, it will describe the ongoing and future work planed to make the model more useful.
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