Publication

Analysis of the initial fragmentation stage of oxide coatings on polymer substrates under biaxial tension

Yves Leterrier
2003
Journal Articles

Abstract

Crack patterns of 100-nm thick silicon oxide coatings on poly(ethylene terephthalate), polypropylene and polyamide films are analyzed under equibiaxial stress loading. The loading is achieved by means of a bulging cell mounted under an optical microscope with stepwise pressurization of film specimens. The evolution of the coating fragment area distribution in the early stages of the fragmentation process is modeled using Weibull statistics to describe the coating strength. Fragment areas are found to follow the exponential distribution at low strains close to the cracking onset. With the increase of equibiaxial strain, the distribution changes reflecting stress transfer and crack propagation features.

Official source

https://infoscience.epfl.ch/entities/publication/fd4600fb-5e8c-454a-8b31-8e94fd33b5d0

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Yves Leterrier
2003
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/fd4600fb-5e8c-454a-8b31-8e94fd33b5d0

About this result

Related concepts (32)

Normal distribution

In statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is The parameter is the mean or expectation of the distribution (and also its median and mode), while the parameter is its standard deviation. The variance of the distribution is . A random variable with a Gaussian distribution is said to be normally distributed, and is called a normal deviate.

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In probability theory and statistics, the exponential distribution or negative exponential distribution is the probability distribution of the time between events in a Poisson point process, i.e., a process in which events occur continuously and independently at a constant average rate. It is a particular case of the gamma distribution. It is the continuous analogue of the geometric distribution, and it has the key property of being memoryless. In addition to being used for the analysis of Poisson point processes it is found in various other contexts.

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