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  • 1
    Electronic Resource
    Electronic Resource
    Fracture mechanics investigations on a pipe with a circumferential flaw supported by FEM
    Amsterdam : Elsevier
    Nuclear Engineering and Design 143 (1993), S. 171-185 
    Details
    ISSN: 0029-5493
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0029-5493(93)90221-T
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  • 2
    Electronic Resource
    Electronic Resource
    CHARACTERIZATION OF DUCTILE TEARING RESISTANCE BY ENERGY DISSIPATION RATE (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 16 (1993), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The J integral, which is widely used in elastic-plastic fracture mechanics, is not the true driving force any more if the crack is propagating. This leads to some inconsistencies when ductile tearing resistance is characterized in terms of J, especially for large crack extensions. Instead, Turner has proposed the energy dissipation rate as a physically more meaningful quantity. His concept is discussed and more evidence is given that will provide a better understanding of ductile tearing. It is shown how this quantity can be determined by measuring the heat production ahead of a fast running crack, or calculated in a finite element analysis, or re-evaluated from J-R test records of bend and tensile specimens. The energy dissipation rate is decreasing with crack extension in gross plasticity and approaches a stationary state. From these relations, the shapes of the cumulative J-R curves can be derived for different specimen geometries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1993.tb00081.x
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  • 3
    Electronic Resource
    Electronic Resource
    Micro-mechanical modelling of ductile damage and tearing – results of a European numerical round robin (2002)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 25 (2002), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Results of a European numerical round robin on the application of constitutive equations for ductile damage to simulate tearing of a ferritic steel are presented. The analysis of deformation and failure of a standard smooth tensile specimen is used to characterize the material and identify critical damage parameters for ductile tearing. Ductile crack growth in a C(T) specimen is then numerically simulated by applying the constitutive models of Gurson or Rousselier in order to predict a JR-curve. Although the tensile tests were satisfactorily described, two main problems arose. The first one is that the participants' results differ considerably from each other with respect to the critical damage parameter obtained in the first task and the predicted JR-curves in the second. The reasons were partially found in the strategies for parameter identification and the non-unique definitions for crack initiation and crack growth used in the simulations. Further reasons are expected in the individual realization of the damage model in the FE programmes or user subroutines. The second problem is a general discrepancy between the simulations and the experiment: most of the predicted JR-curves are too flat compared with the experimental one. Manifold conclusions can be drawn for future work aiming at improving the reliability of the numerical models and promoting their application in engineering practice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.2002.00468.x
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  • 4
    Electronic Resource
    Electronic Resource
    Large stable crack growth in fracture mechanics specimens
    Amsterdam : Elsevier
    Nuclear Engineering and Design 151 (1994), S. 387-400 
    Details
    ISSN: 0029-5493
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0029-5493(94)90183-X
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  • 5
    Electronic Resource
    Electronic Resource
    The Gurson-Tvergaard-Needleman-model for rate and temperature-dependent materials with isotropic and kinematic hardening (1997)
    Springer
    Computational mechanics 20 (1997), S. 34-40 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Based on the upper bound solution of cell models under dynamic or creep loading conditions, the Gurson-Tvergaard-Needleman (GTN) constitutive law of ductile fracture for rate and temperature-dependent materials with isotropic and kinematic hardening has been established. Two additional parameters, which account for the influences of strain rate, inertia and the average distance between voids, have been introduced in the GTN yield criterion. 2D and 3D analysis has been performed for different metals. It can be concluded that the GTN model is a powerful tool for crack growth analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050213
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  • 6
    Electronic Resource
    Electronic Resource
    Notes on plastic reloading zone in the asymptotic analysis of elastic-plastic crack extension (1991)
    Springer
    Archive of applied mechanics 61 (1991), S. 471-478 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Untersucht wird die asymptotische Form von rißspitzennahen Spannungs- und Verformungsfeldern bei der stationären Rißausbreitung in elastisch-plastischen Körpern. Die Bedingung für die Existenz einer rückplastizierten Zone wird formuliert. Wenn eine solche Zone bei verfestigendem Material vorhanden sein soll, muß die Vergleichsspannung bei Annäherung an die Rißflanke unendlich werden. Es wird gezeigt, daß bei Mode III die Lösungen mit logarithmischer Singularität negative Dissipation in der rückplastizierten Zone bedeuten würden.
    Notes: Summary The asymptotic structures of near-tip stress and deformation fields are studied for steady-state crack extension in elastic-plastic solids. The condition for the existence of a plastic reloading zone is formulated. If a plastic reloading zone is to exist in hardening materials, the effective stress must become unbounded as the crack flank is approached. It is shown explicitly in the case of mode III that solutions with logarithmic singularity produce negative plastic dissipation in the plastic reloading sector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00790138
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  • 7
    Electronic Resource
    Electronic Resource
    Prediction of the Work of Separation and Implications to Modeling (1999)
    Springer
    International journal of fracture 99 (1999), S. 97-116 
    Details
    ISSN: 1573-2673
    Keywords: Ductile crack growth ; crack growth simulation ; damage mechanics ; cohesive zone mledl.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Following Barenblatt's idea about the modeling of cracks by the use of a cohesive zone has attracted considerable attention. Recently, this model has also been applied to the prediction of ductile crack growth. For this case the present investigation aims to compare the predictions of a cohesive zone model with the predictions of the more physically based modified Gurson relation. The results demonstrate that in case of ductile fracture the parameters cohesive strength and energy may only be regarded as material properties within a small range of stress triaxialities. This finally leads to the conclusion that special care has to be taken if a cohesive zone model is used for the analysis of ductile fracture. The use of the modified Gurson relation predicts that the cohesive energy and strength do not remain constant throughout a crack growth analysis and their change is not known a priori. Improved cohesive zone models that take a coupling to the surrounding material into account may overcome this problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018300226682
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  • 8
    Electronic Resource
    Electronic Resource
    Elastic-plastic J analysis for an inner surface flaw in a pressure vessel (1988)
    Springer
    Experimental mechanics 28 (1988), S. 205-209 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Elastic-plastic finite-element (FE) analyses of a pressurized cylinder with a deep inner surface flaw were done to study the effect of different loading conditions, i.e., axial forces and crack-face loading. The local energy-release rate was calculated by the method of virtual crack extension including a correction term if pressure acts on the crack faces. The numerical results are compared with a small-scale yielding generalization of the Newman-Raju approximation. The FE analysis reveals that the highest triaxiality of the stress state does not coincide with the point of maximumJ. Thus, an explanation might be found for the experimentally observed canoe shape of stable crack propagation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317575
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  • 9
    Electronic Resource
    Electronic Resource
    Fracture toughness evaluation by tensile and charpy-type tests based on micromechanical models of materials (1995)
    Springer
    Materials science 30 (1995), S. 223-229 
    Details
    ISSN: 1573-885X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract With the aim of applying micromechanical approaches to fracture mechanics, we carried out dynamic tensile tests and instrumented impact tests with Charpy-type specimens both with a V-shaped notch and with a crack. We compared two micromechanical strain-rate-dependent models based on a modified Gurson flow function by simulating various dynamically loaded specimens. The results of the tests indicate that the critical void volume fractionf c and the characteristic lengthl c are practically independent of the strain rate and the geometry of the specimen. The behavior of the specimens subjected to strains and fracture can be characterized by the parameters determined in tensile tests and impact tests with the Charpy-type specimens. By the three-dimensional analysis based on the strain-rate-dependent Gurson model, we predict the onset of crack growth inside the Charpy specimen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00558577
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  • 10
    Electronic Resource
    Electronic Resource
    Bruchmechanische Bauteilbewertung: Verfahren, Regelwerke, Anwendungen. 29. Tagung des DVM-Arbeitskreises Bruchvorgänge. DVM-Bericht 229, 380 Seiten, Deutscher Verband für Materialforschung und -prüfung e. V., Berlin 1997, DM 96,- + 7% MwSt. (für DVM-Mitglieder: DM 57,60 + 7% MwSt.). ISSN 0943-3473 (1997)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 48 (1997), S. 836-836 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19970481213
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