摘要:

AbstractThis paper deals with some aspects of unstructured mesh generation in three dimensions by the advancing front technique. In particular, the parameters used in the algorithm are characterized, and strategies that may be used to improve robustness are suggested. We also describe a method whereby structured tetrahedral meshes with exceptionally stretched elements adjacent to boundary surfaces may be produced. The suggested method can be combined with the advancing front concept in a natural way.

ISSN:0029-5981    

DOI:10.1002/nme.1620382102

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractA solution scheme is presented for constrained non‐linear equations of evolution that result, for example, from the finite element discretization of mechanical contact problems. The algorithm discussed utilizes a quasi‐Newton non‐linear equation solving strategy, with constraints enforced by an augmented Lagrangian iteration procedure. Through presentation of a simple model problem and its generalization, it is shown that the iterations associated with both the quasi‐Newton algorithm and the augmentation procedure can be interwoven to produce a highly efficient and robust solution s

ISSN:0029-5981    

DOI:10.1002/nme.1620382103

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThe present paper reports the development of the Least‐Squares Finite Element Method (LSFEM) for simulating compressible viscous flows at low Mach numbers in which the incompressible flows pose as an extreme. The conventional approach requires special treatments for low‐speed flows calculations: finite difference and finite volume methods are based on the use of the staggered grid or the preconditioning technique, and finite element methods rely on the mixed method and the operator‐splitting method. In this paper, however, we show that such a difficulty does not exist for the LSFEM and no special treatment is needed. The LSFEM always leads to a symmetric, positive‐definite matrix through which the compressible flow equations can be effectively solved. Two numerical examples are included to demonstrate the method: driven cavity flows at various Reynolds numbers and buoyancy‐driven flows with significant density variation. Both examples are calculated by using full compressible flow

ISSN:0029-5981    

DOI:10.1002/nme.1620382104

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractA framework for damage mechanics of brittle solids is presented and exploited in the design and numerical implementation of an anisotropic model for the tensile failure of concrete. The key feature exploited in the analysis is the hypothesis of maximum dissipation, which specifies a unique damage rule for the elastic moduli of the solid once a failure surface is specified. A complete algorithmic treatment of the resulting model is given which renders a useful tool for large‐scale inelastic finite element calculations. A rather simple three‐surface failure model for concrete, containing essentially no adjustable parameters, is shown to produce results in remarkably good agreement with sample experimental d

ISSN:0029-5981    

DOI:10.1002/nme.1620382105

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractIn this paper, we present the boundary integral formulation for inelastic stationary thermoelasticity including thermally induced non‐homogeneity. Generally, the unique BEM formulation for crack problems is achieved by using the traction boundary integral equations which are now considered in a non‐singular form. Both the two‐ and three‐dimensional boundary value problems are analysed simultaneously. Numerical examples for 2‐D problems are presented, in order to illustrate the suitability of this boundary element approach in the inelastic thermoe

ISSN:0029-5981    

DOI:10.1002/nme.1620382106

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractTheoretical and computational aspects of vector‐like parametrization of three‐dimensional finite rotations, which uses only three rotation parameters, are examined in detail in this work. The relationship of the proposed parametrization with the intrinsic representation of finite rotations (via an orthogonal matrix) is clearly identified. Careful considerations of the consistent linearization procedure pertinent to the proposed parametrization of finite rotations are presented for the chosen model problem of Reissner's non‐linear beam theory. Pertaining details of numerical implementation are discussed for the simplest choice of the finite element interpolations for a 2‐node three‐dimensional beam element. A number of numerical simulations in three‐dimensional finite rotation analysis are presented in order to illustrate the propos

ISSN:0029-5981    

DOI:10.1002/nme.1620382107

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractA Lagrangian finite element model of orthogonal high‐speed machining is developed. Continuous remeshing and adaptive meshing are the principal tools which we employ for sidestepping the difficulties associated with deformation‐induced element distortion, and for resolving fine‐scale features in the solution. The model accounts for dynamic effects, heat conduction, mesh‐on‐mesh contact with friction, and full thermo‐mechanical coupling. In addition, a fracture model has been implemented which allows for arbitrary crack initiation and propagation in the regime of shear localized chips. The model correctly exhibits the observed transition from continuous to segmented chips with increasing

ISSN:0029-5981    

DOI:10.1002/nme.1620382108

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractA new method for analysing plate and shell structures with two or more independently modelled finite element subdomains is presented, assessed, and demonstrated. This method provides a means of coupling local and global finite element models whose nodes do not coincide along their common interface. In general, the method provides a means of coupling structural components (e.g., wing and fuselage) which may have been modelled by different analysts. In both cases, the need for transition modelling, which is often tedious and complicated, is eliminated. The coupling is accomplished through an interface for which three formulations are considered and presented. These formulations are: collocation, discrete least‐squares, and hybrid variational. Several benchmark problems are analysed and it is shown that the hybrid variational formulation provides the most accurate solution

ISSN:0029-5981    

DOI:10.1002/nme.1620382109

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:0029-5981    

DOI:10.1002/nme.1620382110

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY

ISSN:0029-5981    

DOI:10.1002/nme.1620382111

出版商:John Wiley&Sons, Ltd    

年代:1995

数据来源: WILEY