Journal of SMT Article

DEVELOPMENT AND APPLICATION OF A PRESS-PIN/PTH RELIABILITY MODEL

Author: A. Kulkarni et al.
Company: Hewlett Packard Company
Date Published: 7/1/2002   Volume: 15-3

Abstract: Press-pin/plated-trough-hole (PP/PTH) technology has been utilized in the electronic systems for more than 25 years [1]. It replaces traditional through-hole wave soldering for board attachments and is widely used in the connector industry.

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 [6]. 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 [6].

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:

  • Simulating and predicting insertion/extraction forces for the PP in the PTH.
  • Predicting and visualizing the damage to PTH walls due to the compliant pin interactions.
  • Predicting thermo-mechanical reliability of PP/PTH assembly.
  • 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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