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  • 1
    Electronic Resource
    Electronic Resource
    Damage analysis by boundary element method (1994)
    Springer
    Acta mechanica solida Sinica 7 (1994), S. 245-255 
    Details
    ISSN: 0894-9166
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The response of cracked bodies subjected to loading was investigated by the boundary element method in this paper. The two-law elastic-cohesive-softening model was used for crack propagation analysis. The interface conditions for uncracked, craze, open crack, adhesive crack and slid crack parts were discussed and the corresponding incremental iteration algorithm was given. A simplified damage propagation model was presented. The technique has been applied to some specific examples which give the evidence that the method is satisfactory and efficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02208369
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Laser Induced Surface Nanostructuring on Ultra-Thin Amorphous Si Films (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 33-36 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: A new approach to obtain Si nanostructures on insulating layer is proposed by laser irradiation onultra-thin hydrogenated amorphous silicon (a-Si:H) films with subsequently thermal annealing. Itwas found that the surface nanostructuring was occurred when the laser fluence exceeded thethreshold value as revealed by AFM images. The size and area density of formed Si nanostructureswere depended on the laser fluence and film thickness while thermal annealing played an importantrole in the size and its distribution. The results showed that a high density (〉1011cm-2) Sinanostructures with average lateral size of 10-20nm can be achieved by the present technology
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.33.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    BIFURCATIONS AND INSTABILITIES IN FRACTURE OF COHESIVE-SOFTENING STRUCTURES: A BOUNDARY ELEMENT ANALYSIS (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 15 (1992), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The “cohesive-crack model” is adopted, together with the hypotheses of small deformations and linear elasticity outside the process zone or “craze”, for the simulation of fracture processes in structures of concrete-like materials. A “direct”, collocation, multidomain boundary element method is employed and shown to be computationally effective in the considered situations, which are characterized by non-linearity on interfaces only. Iterative algorithms for the direction search and interface adjustment in propagation analysis and for the determination of the response to a craze-tip advancement are developed and numerically tested. Softening as an instabilizing factor embodied in the cohesive-crack model may give rise to path bifurcations (“equilibrium branching”), instability under load control and intrinsic (“snapback”) instability. These phenomena are analysed by the proposed boundary element procedure and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1992.tb00066.x
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  • 4
    Electronic Resource
    Electronic Resource
    Symmetric Galerkin boundary element method for quasi-brittle-fracture and frictional contact problems (1993)
    Springer
    Computational mechanics 13 (1993), S. 74-89 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The analysis of elastic quasi-brittle structures containing cohesive cracks and contacts with friction is given a unitary formulation in the framework of incremental plasticity. Integral equations for displacements and tractions are enforced by a weighted-residual Galerkin approach so that symmetry is preserved in the key operators (in contrast to collocation BE approaches) and cracks (either internal or edge cracks) can be dealt with by a single-domain BE formulation. The space-discrete problem in rates is expressed as a linear complementarity problem centered on a symmetric matrix or, equivalently, as a quadratic programming problem in variables pertaining to the displacement discontinuity locus only. Criteria for overall instabilities and bifurcations are derived from this formulation. The BE approach proposed and implemented by a suitable time-stepping technique, is comparatively tested by numerical solutions of cohesive-crack propagation problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350704
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Shakedown analysis of defective pressure vessels by a kinematic approach (1999)
    Springer
    Archive of applied mechanics 69 (1999), S. 751-764 
    Details
    ISSN: 1432-0681
    Keywords: Key words plasticity, shakedown, kinematic approach, pressure vessels, initial defect
    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, a kinematic approach and an iterative procedure, earlier proposed for limit analysis, are adopted for shakedown analysis under variable repeated loading. Reference is made to three-dimensional structures of engineering relevance, such as pressurized pipelines and vessels with fluctuating pressure and with slot damages due, e.g. to pitting corrosion. The numerical performance of the solution algorithm is investigated, and the cost-effectiveness of the proposed direct shakedown analysis method is assessed and compared to that of time-marching solutions by up-to-date codes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050254
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    Paper (German National Licenses)
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