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  • Emerald  (5)
  • 1
    Online Resource
    Online Resource
    A contact detection algorithm for superellipsoids based on the common‐normal concept
    Emerald ; 2008
    In:  Engineering Computations Vol. 25, No. 5 ( 2008-07-18), p. 432-442
    Details
    In: Engineering Computations, Emerald, Vol. 25, No. 5 ( 2008-07-18), p. 432-442
    Abstract: The paper aims to introduce an efficient contact detection algorithm for smooth convex particles. Design/methodology/approach The contact points of adjacent particles are defined according to the common‐normal concept. The problem of contact detection is formulated as 2D unconstrained optimization problem that is solved by a combination of Newton's method and a Levenberg‐Marquardt method. Findings The contact detection algorithm is efficient in terms of the number of iterations required to reach a high accuracy. In the case of non‐penetrating particles, a penetration can be ruled out in the course of the iterative solution before convergence is reached. Research limitations/implications The algorithm is only applicable to smooth convex particles, where a bijective relation between the surface points and the surface normals exists. Originality/value By a new kind of formulation, the problem of contact detection between 3D particles can be reduced to a 2D unconstrained optimization problem. This formulation enables fast contact exclusions in the case of non‐penetrating particles.
    Type of Medium: Online Resource
    ISSN: 0264-4401
    URL: Article
    DOI: 10.1108/02644400810881374
    Language: English
    Publisher: Emerald
    Publication Date: 2008
    detail.hit.zdb_id: 2009342-1
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    Online Resource
  • 2
    Online Resource
    Online Resource
    A virtual element method for frictional contact including large deformations
    Emerald ; 2019
    In:  Engineering Computations Vol. 36, No. 7 ( 2019-08-12), p. 2133-2161
    Details
    In: Engineering Computations, Emerald, Vol. 36, No. 7 ( 2019-08-12), p. 2133-2161
    Abstract: This paper aims to describe the application of the virtual element method (VEM) to contact problems between elastic bodies. Design/methodology/approach Polygonal elements with arbitrary shape allow a stable node-to-node contact enforcement. By adaptively adjusting the polygonal mesh, this methodology is extended to problems undergoing large frictional sliding. Findings The virtual element is well suited for large deformation contact problems. The issue of element stability for this specific application is discussed, and the capability of the method is demonstrated by means of numerical examples. Originality/value This work is completely new as this is the first time, as per the authors’ knowledge, the VEM is applied to large deformation contact.
    Type of Medium: Online Resource
    ISSN: 0264-4401 , 0264-4401
    URL: Article
    DOI: 10.1108/EC-02-2019-0043
    Language: English
    Publisher: Emerald
    Publication Date: 2019
    detail.hit.zdb_id: 2009342-1
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  • 3
    Online Resource
    Online Resource
    Membrane mode enhanced cohesive zone element
    Emerald ; 2022
    In:  Engineering Computations Vol. 39, No. 2 ( 2022-02-08), p. 722-743
    Details
    In: Engineering Computations, Emerald, Vol. 39, No. 2 ( 2022-02-08), p. 722-743
    Abstract: In certain cases, traction–separation laws do not reflect the behaviour sufficiently so that thin volumetric elements, Internal Thickness Extrapolation formulations, bulk material projections or various other approaches are applied. All of them have disadvantages in the formulation or practical application. Design/methodology/approach Damage within thin layers is often modelled using at cohesive zone elements (CZE). The constitutive behaviour of cohesive zone elements is usually described by traction–seperation laws (TSLs) that consider the (traction separation) relation in normal opening and tangential shearing direction. Here, the deformation (separation) as well as the reaction (traction) are vectorial quantities. Findings In this contribution, a CZE is presented that includes damage from membrane modes. Originality/value Membrane mode-related damaging effects that can be seen in physical tests that could not be simulated with standard CZEs are well captured by membrane mode–enhanced cohesive zone elements.
    Type of Medium: Online Resource
    ISSN: 0264-4401
    URL: Article
    DOI: 10.1108/EC-08-2020-0489
    Language: English
    Publisher: Emerald
    Publication Date: 2022
    detail.hit.zdb_id: 2009342-1
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  • 4
    Online Resource
    Online Resource
    Consistent gradient formulation for a stable enhanced strain method for large deformations
    Emerald ; 1996
    In:  Engineering Computations Vol. 13, No. 1 ( 1996-02-01), p. 103-123
    Details
    In: Engineering Computations, Emerald, Vol. 13, No. 1 ( 1996-02-01), p. 103-123
    Abstract: Considers the problem of stability of the enhanced strain elements in the presence of large deformations. The standard orthogonality condition between the enhanced strains and constant stresses ensures satisfaction of the patch test and convergence of the method in case of linear elasticity. However, this does not hold in the case of large deformations. By analytic derivation of the element eigenvalues in large strain states additional orthogonality conditions can be derived, leading to a stable formulation, regardless of the magnitude of deformations. Proposes a new element based on a consistent formulation of the enhanced gradient with respect to new orthogonality conditions which it retains with four enhanced modes volumetric and shear locking free behaviour of the original formulation and does not exhibit hour‐glassing for large deformations.
    Type of Medium: Online Resource
    ISSN: 0264-4401
    URL: Article
    DOI: 10.1108/02644409610111001
    Language: English
    Publisher: Emerald
    Publication Date: 1996
    detail.hit.zdb_id: 2009342-1
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  • 5
    Online Resource
    Online Resource
    A simple local a posteriori bending indicator for axisymmetric membrane and bending shell elements
    Emerald ; 1998
    In:  Engineering Computations Vol. 15, No. 7 ( 1998-11), p. 977-988
    Details
    In: Engineering Computations, Emerald, Vol. 15, No. 7 ( 1998-11), p. 977-988
    Type of Medium: Online Resource
    ISSN: 0264-4401
    URL: Article
    DOI: 10.1108/02644409810236948
    Language: English
    Publisher: Emerald
    Publication Date: 1998
    detail.hit.zdb_id: 2009342-1
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