This work focuses on the interpretation of experimental results obtained from fracture toughness tests conducted for a typical metal/polymer bimaterial interface similar to those encountered in electronic packaging applications. Test specimenswith pre-implanted interfacial cracks were subjected to a series of fracture toughness tests. Interfacial fracture toughness is interpreted from the experimental results as the critical energy release rate (G{sub}c) at the instant of crack advance. Thevalues of G{sub}c from the experiments are determined using direct data reduction methods assuming linear elastic material behavior. These G{sub}c values are compared to critical energy release rate values predicted by closed-form analyses of the tests,and to critical J-integral values obtained from finite-element analyses of the test specimen geometries. The closed-form analyses assume linear elastic material behavior, while the finite-element analyses assume both linear elastic as well aselastic-plastic material behaviors.
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