Crack Path Analysis Technical Brief
Abstract: The objective of this work revolves around a need for an accurate numerical simulation method that computes the stress intensity factors (SIF) along a predicted crack propagation path for planar two dimensional bodies. In response to this need, ESRD has developed an automated procedure in StressCheck®, a p-version finite element analysis (FEA) tool, that computes through-crack stress intensity factors for mode I and mode II along a predicted crack propagation path. This functionality is applicable to planar analysis (2D plate with in-plane loading). The trajectory of the crack is determined by a relationship between mode I and mode II SIF’s (K1 and K2) and is shown to be very accurate.
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“A screening of existent commercial and non-commercial tools was carried out in respect to their fracture mechanics capabilities, their design abilities, implementation as well as their complexity. Although, there are many software possibilities, only those within the reach of the author were evaluated. This resulted in the selection of the commercial tool StressCheck®. The assessment of crack propagation on compact tension and two stringer specimens governed by the Paris and Forman regimes was satisfactory compared with experimental results using the material data from simple standard specimens.”
Lloren Llopart Prieto (EADS)Doctoral Thesis, "Modelling and analysis of crack turning on aeronautical structures"