Statistical analysis of multiple cracking phenomenon of a SiOx thin film on a polymer substrate

The progress of multiple cracking in a silicon oxide (SiOx) film deposited onto a polyethylene terephthalate substrate was analyzed using Monte Carlo simulation. The finite-element analysis, assuming elastoplastic behavior of the polymer substrate, was conducted to calculate the stress distributions in film fragments and was used in the simulation. The Weibull parameters o f the film were determined from the scatter of crack onset strain. The simu lation predicted successfully the crack density and the distribution of fra gment lengths during the progress of multiple cracking. The validity of the shear lag analysis based on the unique stress criterion in a previous stud y was also evaluated. (C) 2001 American Institute of Physics.