The Experts below are selected from a list of 213 Experts worldwide ranked by ideXlab platform
Sergio Cicero - One of the best experts on this subject based on the ideXlab platform.
-
Fracture Assessment of notched short glass fibre reinforced polyamide 6: An approach from Failure Assessment Diagrams and the theory of critical distances
Composites Part B: Engineering, 2017Co-Authors: F.t. Ibáñez-gutiérrez, Sergio CiceroAbstract:Abstract This paper provides a structural integrity Assessment methodology for the analysis of notched short glass fibre reinforced polyamide 6 (SGFR-PA6). The proposal combines the use of Failure Assessment Diagrams for the fracture Assessment and the application of the Theory of Critical Distances for the estimation of the apparent fracture toughness. The assumption that notches behave as cracks may be over conservative, so that the proposal here is to convert the notched situation into an equivalent cracked situation in which the material develops a higher fracture resistance. The methodology has been applied to 125 fracture specimens, combining five different fibre contents and five different notch radii. The results obtained validate the proposed Assessment methodology, with a clear reduction of the conservatism obtained when the notch effect is not considered.
-
Structural integrity analysis of notched ferritic steels operating within their ductile-to-brittle transition zone: An approach from Failure Assessment Diagrams and the Notch Master Curve
Engineering Failure Analysis, 2015Co-Authors: Sergio Cicero, T. Garcia, V. MadrazoAbstract:Abstract This paper provides a structural integrity Assessment methodology for the analysis of ferritic steels containing notch-type defects and operating within their ductile-to-brittle transition zone. The methodology, based on the use of Failure Assessment Diagrams and the novel concept of the Notch Master Curve, has been applied to 323 experimental results performed on four different steels (S275JR, S355J2, S460M and S690Q), six different notch radii (from 0 mm up to 2.0 mm), two different types of specimens (CT and SENB), and three different temperatures within the corresponding ductile-to-brittle transition zone. The results validate the proposed Assessment methodology.
-
Structural Integrity Assessment of Notched Components Using the Master Curve Methodology and Failure Assessment Diagrams
Volume 3: Design and Analysis, 2015Co-Authors: T. Garcia, Sergio Cicero, V. MadrazoAbstract:This paper proposes a methodology for the structural integrity Assessment of notched components. It combines Failure Assessment Diagrams and a notch analysis approach based on the application of the Master Curve methodology for the prediction of the apparent fracture toughness of ferritic-pearlitic steels in notched conditions. This approach considers a new parameter named the notch reference temperature (T0N), which is different from the reference temperature (T0) obtained in cracked specimens and varies with the notch radius. With this purpose, the methodology has been applied to a set of fracture tests on steel S275JR, with notch radii ranging from 0 mm (crack-type defects) up to 2.0 mm and testing temperatures from −120°C up to 40°C. The methodology improves significantly the results obtained under the assumption that notches behave as cracks.© 2015 ASME
-
On the Assessment of U-shaped notches using Failure Assessment Diagrams and the Line Method: Experimental overview and validation
Theoretical and Applied Fracture Mechanics, 2015Co-Authors: Sergio Cicero, V. Madrazo, T. GarciaAbstract:Abstract This paper analyses the structural integrity of components containing U-shaped notches by combining Failure Assessment Diagrams and the Line Method correction for notch effects. With this objective, the experimental results obtained in 555 fracture tests are homogeneously evaluated in the same Failure Assessment Diagram, with and without applying the Line Method notch corrections, and covering a wide range of materials such as PMMA, Al7075-T651, four different structural steels (S275JR, S355J2, S460M and S690Q) tested at different temperatures from the Lower Shelf up to the ductile-to-brittle transition zone, and two rocks (granite and limestone). It is demonstrated that the proposed methodology generally produces significant reductions in the conservatism associated to notch effects, yet providing safe predictions.
-
Assessment of notched structural steel components using Failure Assessment Diagrams and the theory of critical distances
Engineering Failure Analysis, 2014Co-Authors: V. Madrazo, Sergio Cicero, T. GarciaAbstract:Abstract When the structural integrity of notched components is analysed, it is generally assumed that notches behave as cracks, something which generally provides overconservative results. The proposal of this paper consists, on the one hand, in the application of the theory of critical distances for the estimation of the notch fracture toughness and, therefore, for the conversion of the notched situation into an equivalent cracked situation in which the material develops a higher fracture resistance. On the other hand, once the notch fracture toughness has been defined, the Assessment is performed using the Failure Assessment diagram methodology, and assuming that the notch effect on the limit load is negligible. The methodology has been applied to 336 CT notched fracture specimens made of two different structural steels, covering temperatures from the corresponding lower shelf up to the upper shelf, providing satisfactory results and a noticeable reduction in the overconservatism derived from the analyses in which the notch effect is not considered.
F.t. Ibáñez-gutiérrez - One of the best experts on this subject based on the ideXlab platform.
-
Fracture Assessment of notched short glass fibre reinforced polyamide 6: An approach from Failure Assessment Diagrams and the theory of critical distances
Composites Part B: Engineering, 2017Co-Authors: F.t. Ibáñez-gutiérrez, Sergio CiceroAbstract:Abstract This paper provides a structural integrity Assessment methodology for the analysis of notched short glass fibre reinforced polyamide 6 (SGFR-PA6). The proposal combines the use of Failure Assessment Diagrams for the fracture Assessment and the application of the Theory of Critical Distances for the estimation of the apparent fracture toughness. The assumption that notches behave as cracks may be over conservative, so that the proposal here is to convert the notched situation into an equivalent cracked situation in which the material develops a higher fracture resistance. The methodology has been applied to 125 fracture specimens, combining five different fibre contents and five different notch radii. The results obtained validate the proposed Assessment methodology, with a clear reduction of the conservatism obtained when the notch effect is not considered.
B. Nageswara Rao - One of the best experts on this subject based on the ideXlab platform.
-
Generation and validation of Failure Assessment diagram for notched strength prediction of solid propellant tensile specimens
Materials Science and Technology, 2005Co-Authors: A. Subhananda Rao, G. Venkata Rao, B. Nageswara RaoAbstract:Failure Assessment Diagrams are generated utilising the well known inherent flaw model and stress fracture models for accurate prediction of notched tensile strength of different cracked configurations of a solid propellant material. The notched strength estimates from the fracture models are found to be close to the test results. This study indicates that any one of the above fracture models may be used for the generation of a Failure Assessment diagram used to predict the notched strength of cracked configurations made of solid propellant materials.
E. Smith - One of the best experts on this subject based on the ideXlab platform.
-
Normalised effective K versus Lr Failure Assessment Diagrams as applied to a flaw in the vicinity of a stress concentration
International Journal of Engineering Science, 2000Co-Authors: E. SmithAbstract:Abstract Considerable use is now being made of Failure Assessment Diagrams in order to quantify the effect of a defect on the integrity of an engineering structure. Regarding the effect of a sharp crack, it has been shown that the normalised stress intensity ( K r ) versus normalised limit load ( L r ) Failure Assessment curve is geometry dependent, this dependence being particularly strong for the case of a crack at the root of a stress concentration (blunt flaw). In this paper, we develop a Failure Assessment curve for such a situation, in terms of an effective K parameter. K r is now defined in terms of the blunt flaw depth, but as if the blunt flaw were a sharp crack, and the effect of a crack at the root of the flaw is then described in terms of a modification to the blunt flaw Failure Assessment curve. This is a more appealing way of visualising the effect of a sharp crack at the root of a blunt flaw.
-
Kr–Lr Failure Assessment Diagrams as applied to a flaw in the vicinity of a stress concentration: the large Lr regime
International Journal of Pressure Vessels and Piping, 1998Co-Authors: E. SmithAbstract:Abstract This paper is concerned with K r – L r Failure Assessment Diagrams when they are applied to a flaw in the vicinity of a stress concentration. Earlier work by the author has highlighted the strong effect of geometrical parameters on the K r – L r Failure Assessment curve for such a situation. The earlier work had a particular focus on the small L r regime, which was studied via use of the equivalent elastic crack procedure. The present paper proceeds to the other extreme and focuses on the large L r regime for which, as with the small L r regime, there is a strong effect of geometrical parameters on the Failure Assessment curve.
-
kr lr Failure Assessment Diagrams as applied to a flaw in the vicinity of a stress concentration the effect of the severity of the stress concentration
International Journal of Pressure Vessels and Piping, 1997Co-Authors: E. SmithAbstract:Abstract Earlier work has been concerned with the shape of the Kr (normalised stress intensity)-Lr (normalised limit load) Failure Assessment curve for a flaw in the vicinity of a stress concentration. The work has highlighted the strong effect of geometrical parameters on the Kr−Lr curve, thus supporting the view that, when using the R6 methodology, Assessment of such a flaw should be based on the use of Option 3 rather than Options 1 or 2. The present paper focuses on the effect of the stress concentration severity on the shape of the Kr−Lr curve, and analysis of a Mode III simulation model demonstrates the extent to which the Kr−Lr curve deviates from the behaviour appropriate to the two extreme situations where the stress concentration is a sharp crack and where it is a planar surface. The results, therefore, provide additional support for the view that Option 3 should be used to assess the effect of a flaw in the vicinity of a stress concentration.
-
kr lr Failure Assessment Diagrams as applied to a flaw in the vicinity of a stress concentration
International Journal of Pressure Vessels and Piping, 1996Co-Authors: E. SmithAbstract:Abstract Analysis of a Mode III simulation model of a flaw in the vicinity of a stress concentration, highlights the sensitivity of the Failure Assessment curve to geometrical parameters when the curve is expressed in the K r (normalised stress intensity)- L r (normalised limit load) format. The results are therefore supportive of the view that, when using the R6 methodology, Assessment of such a flaw should be based on the use of option 3 rather than options 1 or 2.
A. Subhananda Rao - One of the best experts on this subject based on the ideXlab platform.
-
Generation and validation of Failure Assessment diagram for notched strength prediction of solid propellant tensile specimens
Materials Science and Technology, 2005Co-Authors: A. Subhananda Rao, G. Venkata Rao, B. Nageswara RaoAbstract:Failure Assessment Diagrams are generated utilising the well known inherent flaw model and stress fracture models for accurate prediction of notched tensile strength of different cracked configurations of a solid propellant material. The notched strength estimates from the fracture models are found to be close to the test results. This study indicates that any one of the above fracture models may be used for the generation of a Failure Assessment diagram used to predict the notched strength of cracked configurations made of solid propellant materials.
