Abstract
The mechanical behaviour of short surface cracks is investigated and analysed with respect to its importance for fatigue crack growth. The elastic stress field and the plastic deformation are computed by means of the Boundary Element Method. The influence of material parameters, crack length and loading conditions on the crack tip deformation are investigated. The results are compared to the usual long crack equations based on Linear Elastic Fracture Mechanics (LEFM) and conditions are identified when LEFM becomes non-conservative. A yield stress reduction method is proposed to modify the LEFM equations for such cases in order to obtain reasonable and always conservative predictions for the crack tip deformation.
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