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SMTnet Express, December 27, 2019, Subscribers: 33,251, Companies: 10,949, Users: 25,451

Technical Library

A Life Prediction Model of Multilayered PTH Based on Fatigue Mechanism

Credits: Beihang University

PTH plays a critical role in PCB reliability. Thermal fatigue deformation of the PTH material is regarded as the primary factor affecting the lifetime of electrical devices. Numerous research efforts have focused on the failure mechanism model of PTH. However, most of the existing models were based on the one-dimensional structure hypothesis without taking the multilayered structure and external pad into consideration.

In this paper, the constitutive relation of multilayered PTH is developed to establish the stress equation, and finite element analysis (FEA) is performed to locate the maximum stress and simulate the influence of the material properties. Finally, thermal cycle tests are conducted to verify the accuracy of the life prediction results. This model could be used in fatigue failure portable diagnosis and for life prediction of multilayered PCB.

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