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Träfflista för sökning "AMNE:(TEKNIK OCH TEKNOLOGIER) AMNE:(Maskinteknik) srt2:(1990-1999)"

Sökning: AMNE:(TEKNIK OCH TEKNOLOGIER) AMNE:(Maskinteknik) > (1990-1999)

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1.
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2.
  • van der Wijngaart, Wouter, et al. (författare)
  • Valve-less diffuser fluid micropump
  • 1999
  • Ingår i: Gordon Research Conference 1999, Analytical Chemistry, New Hampshire, USA.
  • Konferensbidrag (refereegranskat)
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3.
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5.
  • Christensen, P. W., et al. (författare)
  • Formulation and comparison of algorithms for frictional contact problems
  • 1998
  • Ingår i: International Journal for Numerical Methods in Engineering. - : John Wiley & Sons. - 0029-5981 .- 1097-0207. ; 42:1, s. 145-173
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents two algorithms for solving the discrete, quasi-static, small-displacement, linear elastic, contact problem with Coulomb friction. The algorithms are adoptions of a Newton method for solving B-differentiable equations and an interior point method for solving smooth, constrained equations. For the application of the former method, the contact problem is formulated as a system of B-differentiable equations involving the projection operator onto sets with simple structure; for the application of the latter method, the contact problem is formulated as a system of smooth equations involving complementarity conditions and with the non-negativity of variables treated as constraints. The two algorithms are numerically tested for two-dimensional problems containing up to 100 contact nodes and up to 100 time increments. Results show that at the present stage of development, the Newton method is superior both in robustness and speed. Additional comparison is made with a commercial finite element code.
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7.
  • Strömberg, Niclas, 1968- (författare)
  • A Newton method for three-dimensional fretting problems
  • 1999
  • Ingår i: International Journal of Solids and Structures. - : Elsevier. - 0020-7683 .- 1879-2146. ; 36:14, s. 2075-2090
  • Tidskriftsartikel (refereegranskat)abstract
    • The present paper concerns the numerical treatment of fretting problems using a finite element analysis. The governing equations resulting from a formal finite element discretization of an elastic body with a potential contact surface are considered in a quasi-static setting. The constitutive equations of the potential contact surface are Signorini's contact conditions, Coulomb's law of friction and Archard's law of wear. Using a backward Euler time discretization and an approach based on projections, the governing equations are written as an augmented Lagrangian formulation which is implemented and solved using a Newton algorithm for three-dimensional fretting problems of didactic nature. Details concerning the implementation are provided.
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8.
  • Strömberg, Niclas, 1968- (författare)
  • An augmented Lagrangian method for fretting problems
  • 1997
  • Ingår i: European journal of mechanics. A, Solids. - : Gauthier-Villars. - 0997-7538 .- 1873-7285. ; 16:4, s. 573-593
  • Tidskriftsartikel (refereegranskat)abstract
    • The present work concerns the numerical treatment of fretting in the interface between a body and a rigid foundation. Starting from a variational formulation of a fretting model given in a framework of continuum thermodynamics, an augmented Lagrangian formulation is derived by introducing finite element discretizations in space and a finite difference discretization in time. The augmented Lagrangian formulation is implemented and solved by a Newton method for the two-dimensional case.
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9.
  • Strömberg, Niclas, 1968-, et al. (författare)
  • Derivation and analysis of a generalized standard model for contact, friction and wear
  • 1996
  • Ingår i: International Journal of Solids and Structures. - : Elsevier. - 0020-7683 .- 1879-2146. ; 33:13, s. 1817-1836
  • Tidskriftsartikel (refereegranskat)abstract
    • A model for mechanical contact including friction, wear and heat generation is proposed. By defining an internal state variable for the wear process, a generalized standard model for contact, friction and wear is derived from the principle of virtual power and the fundamental laws of thermodynamics. Within the frame of the generalized standard model some specific constitutive models are presented. For instance, a free energy corresponding to an extension of Signorini's unilateral contact conditions to include the wear process at the interface and having a linear tangential compliance between the relative tangential displacement and the tangential contact traction is suggested. Furthermore, a dual pseudo-potential with a friction and wear limit criterion in agreement with Coulomb's law of friction Archard's law of wear is given. In order to study existence and uniqueness questions, this pair of free energy and dual pseudo-potential is analysed in a one point elastic quasi-static contact problem with two degrees of freedom and thermal effects neglected. The so-called rate problem is solved.
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