The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
Jose R. Galvele - One of the best experts on this subject based on the ideXlab platform.
-
Anodic rate-controlling steps in transgranular stress corrosion Cracking of α-brass in NaNO2 solutions
Corrosion Science, 2003Co-Authors: M. G. Alvarez, C. Manfredi, M. Giordano, Jose R. GalveleAbstract:Abstract The stress corrosion Cracking susceptibility of yellow brass in 1.0 M NaNO2 solutions was studied. Crack velocities, predicted from fast strain rate experiments were compared with those Measured in slow strain rate tests. Transgranular Crack velocities of ca. 1.1 x 106 ms1 were Measured. Crack velocity was found to be strongly potential dependent, and controlled by an anodic reaction. The fastest Crack velocity shown by the system was that allowed by the anodic reaction on the freshly exposed metal. A description of the Crack propagation process is given, harmonizing the anodic rate control found in the present paper with the Crack-arrest markings reported by other authors for transgranular stress corrosion Cracking.
L Iannucci - One of the best experts on this subject based on the ideXlab platform.
-
measurement of the in situ ply fracture toughness associated with mode i fibre tensile failure in frp part i data reduction
Composites Science and Technology, 2010Co-Authors: M J Laffan, S T Pinho, P Robinson, L IannucciAbstract:The fracture toughness associated with fibre tensile failure was Measured for a T300/920 laminated carbon/epoxy material system using the compact tension specimen configuration. Six methods of data reduction were investigated for calculation of the toughness with the aim of finding the best technique, in terms of reproducibility of results and simplicity. The calculated fracture toughnesses were found to correlate well, though varying amounts of scatter were produced by each method. An optimum method was proposed that does not rely on the use of an optically Measured Crack length.
Claus-peter Bork - One of the best experts on this subject based on the ideXlab platform.
-
Advanced life prediction by microstructural simulation of short Cracks in a low carbon steel
International Journal of Fatigue, 2006Co-Authors: Joachim Hünecke, Dieter Schöne, Dietmar Klingbeil, Claus-peter BorkAbstract:This paper deals with life prediction by observation and simulation of short fatigue Cracks in cyclically loaded smooth and notched specimens made of 0.15 wt-% carbon steel SAE1017. The Measured Crack behaviour was simulated in a microstructural environment. Reference tests under constant amplitude loading allowed to determine model parameters and hence a reasonable life prediction by simulation resulted even for service loading. Short Crack behaviour was a measurable property for damage also to compare smooth and notched specimens.
Véronique Doquet - One of the best experts on this subject based on the ideXlab platform.
-
Mixed mode II and III fatigue Crack growth in a rail steel
International Journal of Fatigue, 2018Co-Authors: Thomas Bonniot, Véronique Doquet, Si Hai MaiAbstract:Abstract Rolling contact fatigue Cracks in rails undergo non-proportional mixed-mode I + II + III, in variable proportions along their front. In order to determine the Crack growth thresholds and kinetics in mixed-mode II/III, asymmetric four point bending tests are run on a rail steel with different angles between the Crack front and the shearing load, so as to vary the mode mixity ratio. For sufficiently high loading ranges, these tests give rise to coplanar shear-mode Crack growth. The effective stress intensity factors (SIFs) are derived by an inverse method from the Measured Crack face relative displacements. It appears to be 10–70% lower than the nominal SIFs and to allow a reasonable correlation of the Measured Crack growth rates. The local application, ahead of the Crack front, of shear-driven or tension-driven fatigue damage models – after 3D elastic-plastic computations of local stress and strain ranges – allows a successful prediction of Crack fronts paths and growth rates.
-
Derivation of effective stress intensity factors from Measured Crack face displacements
Engineering Fracture Mechanics, 2009Co-Authors: G. Bertolino, Véronique DoquetAbstract:Abstract When a Crack is subjected to cyclic shear-mode loading, Crack faces interference wedge the Crack open and reduce the effective ΔKII. The methods proposed in the literature to prevent it or to derive the effective ΔKI and ΔKII are discussed. It is shown that when Crack tip plasticity becomes important it tends to make displacements larger than those predicted by LEFM and to “hide” friction effects. Finite element simulations combining friction and plasticity can separate these two effects, but the analysis of force-sliding displacement loops derived from displacement field measurements based on image correlation is a more straightforward and efficient method.
R. Montes-iturrizaga - One of the best experts on this subject based on the ideXlab platform.
-
A Bayesian Model for the Probability Distribution of Fatigue Damage in Tubular Joints
Journal of Offshore Mechanics and Arctic Engineering, 2004Co-Authors: Ernesto Heredia-zavoni, R. Montes-iturrizagaAbstract:A Bayesian framework is used for updating the probability distributions of the parameters of a fracture mechanics model and of Crack size in tubular joints using information from inspection reports of fixed offshore structures. An error model, defined as the logarithmic difference between Measured Crack size during inspection and Crack size predicted by the fracture mechanics model, is assumed to have a normal distribution with known mean and uncertain variance. The distribution of the error variance is modeled by a conjugate distribution for samples of normal variables with known mean and uncertain variance. Based on these assumptions, an analytical model is obtained using a Bayesian approach for the updated distributions of the parameters of the fracture mechanics model and of Crack size based. The capabilities of the model are illustrated by means of examples using the Paris-Erdogan formulation for Crack growth. The examples illustrate the effects of inspection times, Measured Crack size, and the distribution of stress ranges on the updated density functions of Crack size, time varying reliability and expected cost of failure.