Abstract
The crack-tip displacement field of a central cracked plate of finite size is herein examined to determine the nature of the stress field singularity in cracked-body geometries of this kind. Two algorithms, based on a modified theory of Linear Elastic Fracture Mechanics (LEFM), are constructed for this case for use with Moiré displacement data taken in the neighbourhood of the crack tip of some specimens of this type subjected to various uniform uniaxial strain applied perpendicularly to the line of the crack. It is found that the dominant displacement field exponent confirms the results of recent studies that the classical LEFM square-root stress singularity derived for an idealized infinite body may become invalid when applied to bodies of finite size as a result of free edge or surface effects.
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