Abstract
This paper describes a methodology used to compute stress intensity factor values along the curved front of a fatigue crack inside a nodular cast iron. An artificial defect is introduced at the surface of a small sample. The initiation and growth of a fatigue crack from this defect during constant amplitude cycling is monitored in situ by laboratory X-ray tomography. The method for processing the 3D images in order to compute SIF values is described in detail. The results obtained show variations of the stress intensity factor values along the crack front.
Highlights
In the last decade, in the transport industry, a large research effort has been devoted to the reduction of the structural weight of vehicles in order to Preprint submitted to International Journal of Fatigue reduce fuel consumption and comply with tougher environmental regulation
In the field of cyclic mechanical behaviour, the Paris law established in the sixties is widely used to model fatigue life of components based on propagation laws
The initiation and growth of a fatigue crack from this defect during constant amplitude cycling is monitored in situ by laboratory x-ray tomography
Summary
In the transport industry, a large research effort has been devoted to the reduction of the structural weight of vehicles in order to Preprint submitted to International Journal of Fatigue reduce fuel consumption and comply with tougher environmental regulation This has lead to a more severe use of materials which are submitted to higher mechanical loads than in the past. In the field of cyclic mechanical behaviour (fatigue), the Paris law established in the sixties is widely used to model fatigue life of components based on propagation laws Such laws are established with standard test procedures which monitor crack propagation rates of a relatively long (generally a few millimetres) through crack which front is assumed to be straight. While the size issue can be addressed via the similarity principle (up to some extent, see for example (author?) [1] for a discussion on that topic), the effect of the 3D shape of the crack and the variation of stress intensity factor values that it implies is generally neglected
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