In this paper the impact of the state of barrel-laminate adhesion on the PTH and via stresses is investigated. A representative PTH and a representative blind via in a printed wiring board are used as demonstration vehicles. Transient heat conduction and nonlinear elastic-plastic-contact finite element analyses are carried out on PTHs and vias under the extreme conditions of perfect and zero barrel-laminate adhesion. In general, the maximum equivalent plastic strains in PTHs and vias with strong barrel-laminate adhesion are not large enough to fracture the plating. Fracture is possible at or near the innerplane junction when barrel-laminate adhesion is lost. The possibility of plating fracture in a blind via is strongly dependent on the tolerances in manufacturing process parameters such as drill depth and laminate thickness.
The Impact of Interfacial Adhesion on PTH and Via Stress State
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Subbarayan, G., Ramakrishna, K., and Sammakia, B. G. (December 1, 1997). "The Impact of Interfacial Adhesion on PTH and Via Stress State." ASME. J. Electron. Packag. December 1997; 119(4): 260–267. https://doi.org/10.1115/1.2792247
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