In the present paper we describe and demonstrate a computationally efficient technique for analyzing fracture mechanics problems in mixed linear - nonlinear systems. The technique combines the methodology of Rybicki and Kanninen for calculation of the energy release rate in fracture processes with a decomposition based analysis procedure recently proposed by Sub baryon and coworkers. The methodology will enable quick design desicions during the package developmental stages without significant loss of accuracy. The developed procedure is demonstrated on a hypothetical 5x5 array package. It is shown that on this representative package nearly 30% time savings (or a 150 % speedup) can be acheived in estimating the energy release rate at an accuracy loss of only 6.2%. Prior research has shown that the analysis time is nearly independent of package size indicating nu-bounder speed-ups for larger package sizes.
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