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  • 1
    Electronic Resource
    Electronic Resource
    Notch sensitivity of thermoset and thermoplastic laminates loaded in tension (1989)
    Springer
    Journal of materials science 24 (1989), S. 1670-1682 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Inplane tensile fracture of unnotched and notched thermoset graphite-epoxy and thermoplastic graphite-PEEK composite laminates is examined. Both fibre-dominated quasi-isotropic and matrix dominated ±45 angle-ply layups were investigated. Classical lamination theory predictions of elastic and strength properties of unnotched specimens are compared with experiments. Several notched geometries, i.e. centre-notched, double-edge notched and open-hole specimens subjected to tensile loading to fracture were examined. The notched strength of the quasi-isotropic laminates was analysed by a damage zone model, where damage around the notch is represented by an “equivalent crack” with cohesive force acting between the crack surfaces. Good agreement between experimental and calculated strength was observed for the graphite-epoxy laminates which failed in a collinear manner. For the graphite-PEEK laminates discrepancies between predicted and experimental strength are related to observed deviations from collinear crack growth. The angle-ply graphite-PEEK laminates showed larger notch sensitivity than the corresponding graphite-epoxy, probably due to less degree of stress relieving damage formation around the notch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01105690
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Summary of SIF design graphs for cracks emanating from circular holes (1978)
    Springer
    International journal of fracture 14 (1978), S. 585-596 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé One donne une synthèse des solutions existantes pour la détermination des facteurs d'intensité des contraintes dans le cas de fissures traversant l'épaisseur et émanant de trous circulaires. De nouvelles solutions sont fournies pour certains cas de fissures amorcées à des trous circulaires dans des plaques finies. Les résultats ont été obtenus par la méthode des éléments finis en utilisant des éléments quart-point isoparamétriques à 8 noeuds, ainsi que par l'intégrale J. Les problèmes de calcul qui se présentent dans le cas de fissures courtes sont discutées et une méthode approximative est examinée. La précision des données fournies est en général de l'ordre de quelques pourcents.
    Notes: Abstract A summary is given of existing solutions for stress intensity factors for through-the-thickness cracks emanating from circular holes. New solutions are given for some cases of cracks at circular holes in finite plates. The results were obtained by the finite element method with isoparametric eight-noded quarter point elements and the J-integral. Computational problems arising at short cracks are discussed and an approximate method evaluated. The accuracy of the given data is in general within a couple of percent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115997
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Finite element analysis of elasto-plastic shellsThis research was sponsored by AB Volvo, Göteborg, Sweden. (1974)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 8 (1974), S. 415-424 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A finite element analysis applicable to elasto-plastic shells of arbitrary shape is presented. Small-deflection behaviour of thin shells subjected to monotonically increasing static loads is considered. The material is assumed to be originally isotropic, following the von Mises yield criterion and the Prandtl-Reuss flow rule. A flat triangular element with twelve degrees of freedom is used in the analysis. Within each element both membrane forces and bending moments are assumed to be constant. Some numerical results are included to illustrate the merits of the element.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620080217
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  • 4
    Electronic Resource
    Electronic Resource
    On isoparametric elements (1978)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 12 (1978), S. 731-732 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620120418
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    Paper (German National Licenses)
    Fulltext
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