Abstract
Fracture of components and structures are usually produced by the propagation of fatigue cracks. A fatigue crack can be stopped by a decrease of the notch sharpness and by residual compressive stresses at the crack tip. Many methods can be used to arrest the crack propagation, but one of the simplest ones is to drill a hole at the crack tip or at a convenient distance ahead of the expected crack growth path. In the expanded hole method, the crack arrest is obtained by expanding a hole at the crack tip, so as to produce a compressive residual stress field, reducing the effective stress around the crack tip. In the present work the results of neutron diffraction experiments, carried out at the D1A diffractometer of ILL-Grenoble, for the evaluation of the residual stress field in precracked steel submitted to the hole expansion method are presented. The results are compared to calculations and discussed.
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