Abstract

A full field method for visualizing strain fields around a crack tip under large strains is developed. Digital image correlation is used to compute strains and displacements incrementally between consecutive images in a process of large deformations. Values of strain and displacements for these consecutive deformations are added such that convergence of the DIC algorithm is assured. The method is used to investigate the strain distribution in a globally homogeneously strained particulate composite (solid propellant) as well as in a zone close to (∼2 mm) the crack tip in such a material by using a microscope. It is found that maximal strain variations deviate by as much as a factor of three from the average strain ; additionally, observations on the interaction of strain inhomogeneities with the tip of a macroscopic crack are discussed.

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