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  • Articles  (8)
  • FEM  (8)
  • Springer  (8)
  • American Chemical Society
  • 1995-1999  (8)
  • 1995  (8)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (8)
Collection
  • Articles  (8)
Source
Keywords
Publisher
  • Springer  (8)
  • American Chemical Society
Years
  • 1995-1999  (8)
Year
Topic
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Diagnostic expert systems for defects in forged parts (1995)
    Springer
    Journal of intelligent manufacturing 6 (1995), S. 163-173 
    Details
    ISSN: 1572-8145
    Keywords: Hot forging ; part defects ; diagnosis ; Bayesian learning ; cracks ; HyperCard ; animation ; FEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes the development of a diagnostic expert system that identifies the cause of various manufacturing defects in hot forging and suggests remedies. The patterns of defect generation are various and due to many possible causes. They depend on part designs, tool designs and process conditions. Pertinent factors include part shape, the state of lubrication, location of the performed workpiece on the die and formability of the materials. This paper utilizs the theory of conditional probability to construct a diagnostic expert system that can adapt and learn its diagnostic mechanism through field data. A demonstration program, FORDIA, runs in HyperCard. FORDIA takes the part defect symptoms, uses conditional probability theory to identify possible causes and suggests remedies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171445
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  • 2
    Electronic Resource
    Electronic Resource
    A theory and finite element formulation of shells at finite deformations involving thickness change: Circumventing the use of a rotation tensor (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 194-216 
    Details
    ISSN: 1432-0681
    Keywords: Shells ; FEM ; finite deformations ; rotation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary A nonlinear shell theory, including transverse strains perpendicular to the shell midsurface, as well as transverse shear strains, with exact description of the kinematical fields, is developed. The strain measures are derived by considering theGreen strain tensor of the three-dimensional shell body. A quadratic displacement field over the shell thickness is considered. Altogether seven kinematical fields are incorporated in the formulation. The kinematics of the shell normal is described by means of a difference vector, avoiding the use of a rotation tensor and resulting in a configuration space, where the structure of a linear vector space is preserved. In the case of linear constitutive equations, a possible consistent reduction to six degrees of freedom is discussed. The finite element formulation is based on a hybrid variational principle. The accuracy of the theory and its wide range of applicability is demonstrated by several examples. Comparison with results based on shell theories formulated by means of a rotation tensor are included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00799298
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  • 3
    Electronic Resource
    Electronic Resource
    A Theory and finite element formulation of shells at finite deformations involving thickness change: Circumventing the use of a rotation tensor (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 194-216 
    Details
    ISSN: 1432-0681
    Keywords: Key words Shells ; FEM ; finite deformations ; rotation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  A nonlinear shell theory, including transverse strains perpendicular to the shell midsurface, as well as transverse shear strains, with exact description of the kinematical fields, is developed. The strain measures are derived by considering the Green strain tensor of the three-dimensional shell body. A quadratic displacement field over the shell thickness is considered. Altogether seven kinematical fields are incorporated in the formulation. The kinematics of the shell normal is described by means of a difference vector, avoiding the use of a rotation tensor and resulting in a configuration space, where the structure of a linear vector space is preserved. In the case of linear constitutive equations, a possible consistent reduction to six degrees of freedom is discussed. The finite element formulation is based on a hybrid variational principle. The accuracy of the theory and its wide range of applicability is demonstrated by several examples. Comparison with results based on shell theories formulated by means of a rotation tensor are included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00799298
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of elasto-viscoplastic plates and shells (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 326-345 
    Details
    ISSN: 1432-0681
    Keywords: non-linear dynamics ; viscoplasticity plates ; shells ; FEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary In this paper, the problem of the elasto-viscoplastic dynamic behaviour of geometrically non-linear plates and shells is studied under the assumption of small strains and moderate rotations. The Chaboche and Bodner-Partom models were chosen among several types of constitutive laws. To avoid the calculation of the stiffness matrix, an effective procedure using the central difference method of solving the equations of motion was applied. The trapezoidal method was used to integrate the constitutive viscoplastic laws. A nine-node isoparametric shell element was utilised for the finite element algorithm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00789224
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamics of elasto-viscoplastic plates and shells (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 326-345 
    Details
    ISSN: 1432-0681
    Keywords: Key words non-linear dynamics ; viscoplasticity plates ; shells ; FEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  In this paper, the problem of the elasto-viscoplastic dynamic behaviour of geometrically non-linear plates and shells is studied under the assumption of small strains and moderate rotations. The Chaboche and Bodner-Partom models were chosen among several types of constitutive laws. Toavoid the calculation of the stiffness matrix, an effective procedure using the central difference methodof solving the equations of motion was applied. The trapezoidal method was used to integrate theconstitutive viscoplastic laws. A nine-node isoparametric shell element was utilised for the finite element algorithm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00789224
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  • 6
    Electronic Resource
    Electronic Resource
    Finite element analysis of edge lamination during hot rolling process of aluminium alloy (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 365-373 
    Details
    ISSN: 1432-0681
    Keywords: hot rolling ; edge lamination ; 3-D deformation ; rigid plasticity ; FEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The rigid-plastic finite element method is applied to the analysis of the three-dimensional deformation behaviour, in particular the forming of edge lamination during the multi-pass hot roughing process of aluminium. the calculation is carried out for various rolling conditions and reduction schedules, and their influence on the edge lamination is examined. The results suggest that the crop loss due to the edge lamination can be reduced by increasing the roll diameter, the reduction per pass and the initial width of the slab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00787530
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  • 7
    Electronic Resource
    Electronic Resource
    An axisymmetrical quasi-Kirchhoff-type shell element for large plastic deformations (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 465-477 
    Details
    ISSN: 1432-0681
    Keywords: FEM ; shell ; finite plasticity ; associated flow rule ; isotropic hardening
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary An axisymmetrical shell element for large plastic strains is developed. The theory is based on the multiplicative decomposition of the material deformation gradient into an elastic and a plastic part. For quasi-Kirchhoff-type axisymmetric shells this leads to a product of the elastic and plastic stretches. By introduction of logarithmic strains the decomposition becomes additive. Plastic incompressibility is fulfilled in an exact manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00835659
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  • 8
    Electronic Resource
    Electronic Resource
    Finite element analysis of edge lamination during hot rolling process of aluminium alloy (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 365-373 
    Details
    ISSN: 1432-0681
    Keywords: Key words Hot rolling ; edge lamination ; 3-D deprmetion ; rigid plasticity ; FEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  The rigid-plastic finite element method is applied to the analysis of the three-dimensional deformation behaviour, in particular the forming of edge lamination during the multi-pass hot roughing process of aluminium. The calculation is carried out for various rolling conditions and reduction schedules, and their influence on the edge lamination is examined. The results suggest that the crop loss due to the edge lamination can be reduced by increasing the roll diameter, the reduction per pass and the initial width of the slab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00787530
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