Abstract
Unidirectional tensile tests of PMMA square hole specimens result in mixed mode crack initiation at the square hole corners, highlighted by inclined cracks with respect to the V-notch bisector. Generalized stress intensity factors (GSIF) of the opening and shear modes at a V-notch are derived experimentally in a direct manner from digital image correlation (DIC) displacement and strain fields by means of a path independent integral. With increasing square hole side, the opening mode GSIF increases whereas the shear mode one decreases so that the mode mixity globally decreases, together with the crack deflection with respect to the V-notch bisector. GSIFs predictions obtained by means of finite element calculations are in good agreement with those determined experimentally.
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