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  • 1
    Electronic Resource
    Electronic Resource
    Inclined pileup of edge dislocations near the crack tip (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3535-3541 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation of a plastic zone, in the form of a linear array of inclined edge dislocations in front of a mode-I crack in plane strain, is studied. The direction of the force field on an edge dislocation due to the crack load allows for the determination of the plastic zone as a function of the inclination angle. The dislocation distribution along the plastic zone is found from force equilibrium considerations. The results show the presence of a dislocation-free zone (DFZ) and a shrinking of the plastic zone size with greater angle of inclination. The latter angle does not seem to influence the DFZ size. The way in which we determined the stress field allows us to study the influence of defects on the plastic zone formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344111
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Automatic Mixed-Mode Crack Propagation based on a Combined Hexahedral-TetrahedralApproach (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 581-584 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present paper, a new method for inserting cracks with out-of-plane features is presented.Starting point is an arbitrary reference structure and a crack of any shape. The final crackedstructure is represented by hexahedral elements in the crack-front region and tetrahedral elements inthe remaining structure domain. The tetrahedron is employed to take advantage of the versatilemeshing capabilities and the collapsed quarter-point hexahedron gives good crack-tip behaviour.Stress intensity factors are calculated from the asymptotic stress field, retrieved from the integrationpoints near the crack-tip
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.581.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Automatic 3-D Crack Propagation Calculations in Industrial Components: A Pure Hexahedral versus a Combined Hexahedral-Tetrahedral Approach (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 45-48 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In recent years, increased loading and low weight requirements have led to the need forautomatic crack tracing software. At MTU a purely hexahedral code has been developed in thenineties for Mode-I applications. It has been used extensively for all kinds of components and hasproven to be very flexible and reliable. Nevertheless, in transition regions between complex componentscurved cracks have been observed, necessitating the development of mixed-mode software.Due to the curvature of the crack faces, purely hexahedral meshes are not feasible, and therefore amixture of hexahedral elements at the crack tip, combined with tetrahedral in the remaining structurehas been selected. The intention of the present paper is to compare both methods and to pointout the strength and weaknesses of each regarding accuracy, complexity, flexibility and computingtime. Furthermore, difficulties arising from the out-of-plane growth of the crack such as the determinationof the crack propagation direction are discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.348-349.45.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    A New Three-Dimensional Fracture Criterion (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 251-252 (Oct. 2003), p. 209-214 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.251-252.209.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Stability of collapsed 8-node 2-D and 20-node 3-D isoparametric finite elements (1994)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 37 (1994), S. 475-496 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The collapse of ordinary finite elements to generate the desired strain singularity at the crack tip for fracture mechanics applications can lead to unwanted additional singularities in that area. Although neither the quarter-point nor the half-point 8-node two-dimensional (2-D) and 20-node three-dimensional (3-D) elements exhibit this behaviour, the present article proves that arbitrarily small deviations from the quarter-point element can be constructed which do have additional singularities. Since the general behaviour of the half-point element is not affected by small modifications, this element is better suited to match complex body geometries.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620370307
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    General behaviour of collapsed 8-node 2-D and 20-node 3-D isoparametric elements (1993)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 36 (1993), S. 1223-1243 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper presents a simple and thorough technique to examine the general behaviour of two-dimensional (2-D) 8-node and 3-D 20-node isoparametric elements, collapsed at one side. With this method the conditions for the well-known quarter-point and half-point elements, frequently used in fracture mechanics applications to model the crack tip behaviour, are arrived at in a natural way. It also allows for an in-depth analysis of the Jacobian determinant, and can easily be applied to other types of elements.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620360708
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  • 7
    Electronic Resource
    Electronic Resource
    Automatic 3-D mode I crack propagation calculations with finite elements (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 41 (1998), S. 739-757 
    Details
    ISSN: 0029-5981
    Keywords: finite element method ; crack propagation ; low cycle fatigue ; remeshing ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: An algorithm is presented which allows for fully automatic linear elastic low cycle fatigue (LCF) crack propagation calculations of mode I plane cracks in large structures by means of the finite element technique. The bulk of the algorithm consists of an automatic procedure to introduce the geometry of a plane crack with an arbitrary crack front in an existing three-dimensional (3-D) mesh. Once the K-distribution for the initial crack has been calculated, the use of the superelement technique reduces the computing time for the subsequent cycles by a factor of up to 40 or more. Two industrial examples illustrate the accuracy and effectiveness of the method. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 8
    Electronic Resource
    Electronic Resource
    Cutting of a 3-D finite element mesh for automatic mode I crack propagation calculations (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 42 (1998), S. 749-772 
    Details
    ISSN: 0029-5981
    Keywords: crack ; propagation ; remeshing ; mode-I ; three-dimensional ; finite element method ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A previous article (G. Dhondt, ‘Automatic 3-D mode I crack propagation calculations with finite elements’, Int. J. Numer. Meth. Engng. 41, 739-757 (1998)) has illustrated how automatic 3-D mode I cyclic crack propagation calculations making repeated use of the finite element method can be performed for structures in which the crack plane is made up of element faces. In the present paper an automatic cutting procedure is proposed which allows the method to be applied to arbitrarily meshed structures for which the crack plane intersects the elements. New 20-node brick elements are automatically generated and a subsequent smoothing procedure improves the quality of the resulting mesh. The method is illustrated by cyclic crack propagation calculations in a specimen and an industrial component. © 1998 John wiley & Sons, Ltd.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
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