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  • 1
    Electronic Resource
    Electronic Resource
    Constrained finite rotations in dynamics of shells and Newmark implicit time-stepping schemes (2005)
    Bradford : Emerald
    Engineering computations 22 (2005), S. 505-535 
    Details
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: Purpose - Aims to address the issues pertaining to dynamics of constrained finite rotations as a follow-up from previous considerations in statics. Design/methodology/approach - A conceptual approach is taken. Findings - In this work the corresponding version of the Newmark time-stepping schemes for the dynamics of smooth shells employing constrained finite rotations is developed. Different possibilities to choose the constrained rotation parameters are discussed, with the special attention given to the preferred choice of the incremental rotation vector. Originality/value - The pertinent details of consistent linearization, rotation updates and illustrative numerical simulations are supplied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02644400510602998
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  • 2
    Electronic Resource
    Electronic Resource
    Shape optimization of two-phase inelastic material with microstructure (2005)
    Bradford : Emerald
    Engineering computations 22 (2005), S. 605-645 
    Details
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: Purpose - Proposes a methodology for dealing with the problem of designing a material microstructure the best suitable for a given goal. Design/methodology/approach - The chosen model problem for the design is a two-phase material, with one phase related to plasticity and another to damage. The design problem is set in terms of shape optimization of the interface between two phases. The solution procedure proposed herein is compatible with the multi-scale interpretation of the inelastic mechanisms characterizing the chosen two-phase material and it is thus capable of providing the optimal form of the material microstructure. The original approach based upon a simultaneous/sequential solution procedure for the coupled mechanics-optimization problem is proposed. Findings - Several numerical examples show a very satisfying performance of the proposed methodology. The latter can easily be adapted to other choices of design variables. Originality/value - Confirms that one can thus achieve the optimal design of the nonlinear behavior of a given two-phase material with respect to the goal specified by a cost function, by computing the optimal form of the shape interface between the phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02644400510603032
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On numerical implementation of a coupled rate dependent damage-plasticity constitutive model for concrete in application to high-rate dynamics (2005)
    Bradford : Emerald
    Engineering computations 22 (2005), S. 583-604 
    Details
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: Purpose - To provide an efficient and robust constitutive equations for concrete ion application to high rate dynamics. Design/methodology/approach - Develops an explicit-implicit integration scheme for a concrete model. This robust integration scheme ensures computational efficiency. Comparison between simulations of impact of equivalent aircraft engine projectiles and the tests carried out in Sandia laboratory also demonstrate its efficiency. Findings - Shows that modeling transient high rate dynamic behavior of concrete is very important to take into account for design concrete structures in the cases of dynamic loading conditions, such as an impact on the structure. Originality/value - Proposes an original integration scheme for a coupled rate dependent damage plasticity model. Also provides a detailed consideration of the numerical stability of this kind of scheme for rate-dependent damage model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02644400510603023
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  • 4
    Electronic Resource
    Electronic Resource
    Multi-scale modeling of heterogeneous structures with inelastic constitutive behaviour: Part I - physical and mathematical aspects (2005)
    Bradford : Emerald
    Engineering computations 22 (2005), S. 664-683 
    Details
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: Purpose - To provide a computational strategy for highly accurate analyses of non-linear inelastic behaviour for heterogeneous structures in civil and mechanical engineering applications Design/methodology/approach - Adapts recent developments on mathematical formulations of multi-scale problems to the recently developed component technology based on C++ generic templates programming. Findings - Provides the understanding how theoretical hypotheses, concerning essentially the multi-scale interface conditions, affect the computational precision of the strategy. Practical implications - The present approach allows a very precise modelling of multi-scale aspects in structural mechanics problems and can play an essential tool in searching for an optimal structural design. Originality/value - Provides all the ingredients for constructing an efficient multi-scale computational framework, from the theoretical formulation to the implementation for parallel computing. It is addressed to researchers and engineers analysing composite structures under extreme loading.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02644400510603050
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  • 5
    Electronic Resource
    Electronic Resource
    Finite elastoplastic deformation of membrane shells (1996)
    Bradford : Emerald
    Engineering computations 13 (1996), S. 122-142 
    Details
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: Under restriction of an isotropic elastic response of deformed lattice, develops a covariant theory of finite elastoplasticity in principal axes of a pair of deformation tensors. In material description, the tensor pair consists of the plastic deformation tensor and the total deformation Cauchy-Green tensor. Applies the proposed theory to elastoplastic membrane shells, whose references and current configurations can be arbitrary space-curved surfaces. Pressure-insensitive von Mises yield criterion with isotropic hardening and a quadratic form of the strain energy function given in terms of elastic principal stretches are considered as a model problem. Through an explicit enforcement of the plane stress condition we arrive at a reduced two-dimensional problem representation, which is set in the membrane tangent plane. Numerical implementation of the presented theory relies crucially on the operator split methodology to simplify the state update computation. Presents a set of numerical examples in order to illustrate the performance of the presented methodology and indicate possible applications in the area of sheet metal forming.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02644409610114503
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    On the relation between different parametrizations of finite rotations for shells (2001)
    Bradford : Emerald
    Engineering computations 18 (2001), S. 950-973 
    Details
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: In this work we present interrelations between different finite rotation parametrizations for geometrically exact classical shell models (i.e. models without drilling rotation). In these kind of models the finite rotations are unrestricted in size but constrained in the 3-d space. In the finite element approximation we use interpolation that restricts the treatment of rotations to the finite element nodes. Mutual relationships between different parametrizations are very clearly established and presented by informative commutative diagrams. The pluses and minuses of different parametrizations are discussed and the finite rotation terms arising in the linearization are given in their explicit forms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02644400110403984
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  • 7
    Electronic Resource
    Electronic Resource
    Prediction of crack pattern distribution in reinforced concrete by coupling a strong discontinuity model of concrete cracking and a bond-slip of reinforcement model (2005)
    Bradford : Emerald
    Engineering computations 22 (2005), S. 558-582 
    Details
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: Purpose - To provide a reinforced concrete model including bonding coupled to a classical continuum damage model of concrete, capable of predicting numerically the crack pattern distribution in a RC structure, subjected to traction forces. Design/methodology/approach - A new coupling between bonding model and an alternative model for concrete cracking is proposed and analyzed. For concrete, proposes a damage-like material model capable of combining two types of dissipative mechanisms: diffuse volume dissipation and localized surface dissipation. Findings - One of the most important contributions is the capacity of predicting maximal and minimal spacing of macro-cracks, even if the exact location of cracks remains undetermined. Another contribution is to reiterate on the insufficiency of the local damage model of concrete to handle this class of problems; much in the same manner as for localization problem which accompany strain-softening behavior. Practical implications - Bonding becomes very important to evaluate both the integrity and durability of a RC structure, or in particular to a reliable prediction of crack spacing and opening, and it should be integrated in future analysis of RC. Originality/value - Shows that introduction of the influence of concrete heterogeneities in numerical analysis can directly affect the configuration of the crack pattern distribution. Use of a strong discontinuity approach provides additional cracking information like opening of macro-cracks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/02644400510603014
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Finite Element Method in Dynamics of Flexible Multibody Systems: Modeling of Holonomic Constraints and Energy Conserving Integration Schemes (2000)
    Springer
    Multibody system dynamics 4 (2000), S. 195-223 
    Details
    ISSN: 1573-272X
    Keywords: flexible multibody system ; holonomic constraint ; time integration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this work we discuss an application of the finite elementmethod to modeling of flexible multibody systems employing geometricallyexact structural elements. Two different approaches to handleconstraints, one based on the Lagrange multiplier procedure and anotherbased on the use of release degrees of freedom, are examined in detail.The energy conserving time stepping scheme, which is proved to be wellsuited for integrating stiff differential equations, gouverning themotion of a single flexible link is appropriately modified and extendedto nonlinear dynamics of multibody systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009867627506
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  • 9
    Electronic Resource
    Electronic Resource
    Thick shell and solid finite elements with independent rotation fields (1991)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 31 (1991), S. 1393-1414 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Thick shell and solid elements presented in this work are derived from variational principles employing independent rotation fields. Both elements are built on a special hierarchical interpolation and both possess six degrees of freedom per node. Performance of the elements is evaluated on a set of problems in elastostatics. However, the formulation presented herein is also suitable for transient and non-linear problems.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620310711
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Unified computational model for static and dynamic frictional contact analysis (1992)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 34 (1992), S. 233-247 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A new computational model for the analysis of friction phenomena is presented in this work. The model is a regularized form of the Coulomb friction law, which stems from the analogy of friction and plasticity phenomena. The basic difference from the classical plasticity is the non-linear form of both the normal and the tangential elastic compliance. The numerical implementation of the model is also discussed. The methodology presented herein is used for the analysis of both dynamic and quasi-static problems. The dynamic substructuring and the static condensation are used to enhance the computational efficiency.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620340115
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