Noise-robust Stress Intensity Factor Determination from Kinematic Field Measurements

Abstract : Stress Intensity Factors are often estimated numerically from a given displacement field through an interaction integral formalism. The latter method makes use of a weight, the virtual crack extension field, which is under-constrained by first principles. Requiring a least noise sensitivity allows one to compute the optimal virtual crack extension. Mode I and mode II specialized fields are obtained and particularized for a given displacement functional basis. The method is applied to an experimental case study of a crack in a silicon carbide sample, whose displacement field is obtained by a digital image correlation technique. The optimization leads to a very significant uncertainty reduction up to a factor 100 of the non-optimized formulation. The proposed scheme reveals additional performances with respect to the integral domain choice and assumed crack tip geometry, which are shown to have a reduced influence.
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Submitted on : Friday, January 11, 2008 - 2:39:14 PM
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Julien Réthoré, Stéphane Roux, François Hild. Noise-robust Stress Intensity Factor Determination from Kinematic Field Measurements. Engineering Fracture Mechanics, Elsevier, 2008, 75 (13), pp.3763-3781. ⟨10.1016/j.engfracmech.2007.04.018⟩. ⟨hal-00200631⟩

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