Fatigue failures are known to occur in leads of insertionmount components, when electronic printed circuit assemblies are subjected to severe vibration loads.  As a result, the reliability of through-hole-interconnections is reduced.  Fatigue life of leads in a through-hole package is a complex function of constitutive properties, architecture and geometry of the package, and vibration loads applied to it.  Therefore, a general and a concise method can be utilized to estimate the fatigue life of leaded through-hole components is not only desired, but also crucial.  The main objective of the present study is to formulate a mode, based on energy principles, to analyze fatigue endurance of leads in a through-hole package.  The hole is to formulate a design tool, which can be used to examine the influence of material and geometric variables on fatigue life of leads in through-hole electronic packages.
 

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