Abstract
An analysis is carried out of the crack tip stress intensity factor existing around the front of a semi-elliptical surface flaw, when it is propelled by a Hertzian indentation test. The influence of crack size, position, ellipticity and orientation on stress intensity factors and strain energy release rate is investigated. It is shown that generally a surface flaw will “run around” to form a shallow ring crack before propagating inwards into the material.
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