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Cohesive Zone Model Applied to Creep Crack Initiation at an Interface Edge between Submicron Thick Films

Department of Mechanical Engineering and Sciences Kyoto University, Kyoto 606-8501, Japan

^* To whom correspondence should be addressed.

	Abstract

A crack initiates at an interface edge between submicron thick films and leads to the malfunction of microelectronic devices. In this study, the cohesive zone model method with a cohesive law based on the damage mechanics concept is developed to simulate the creep crack initiation at an interface edge between tin and silicon films. Experiments on delamination at the Sn/Si interface using a micro-cantilever bend specimen were conducted. The cohesive law is applied to the elements in the UEL user subroutine in the finite element code ABAQUS. The parameters characterizing the cohesive law are calibrated by fitting displacement-time curves obtained by experiments and FEM simulations. It is revealed that the order of stress singularity increases with time and has a significant jump in its value at the crack initiation.

Key Words: cohesive zone model, crack initiation, creep, thin film, interface strength.

First published on April 23, 2009
International Journal of Damage Mechanics 2009, doi:10.1177/1056789509103651


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