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    The finite element method applied to the analysis of tall structural codes. The development of compatible, self equilibriating and hybrid finite elements, and their application to 'plane shear wall' and 'core' problems of the type encountered in modern tall buildings.

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    Publication date
    2009-10-28T15:28:08Z
    Author
    Boot, John C.
    Supervisor
    Wilby, C.B.
    Keyword
    Finite element method
    Structural analysis
    Tall structures
    Self equilibriating finite elements
    Hybrid finite elements
    Plane shear wall problems
    Core problems
    Tall buildings
    Rights
    Creative Commons License
    The University of Bradford theses are licenced under a Creative Commons Licence.
    Institution
    University of Bradford
    Department
    Postgraduate School of Studies in Civil and Structural Engineering.
    Awarded
    1976
    
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/10454/3793
    Type
    Thesis
    Qualification name
    PhD
    Collections
    Theses

    entitlement

     

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      Mechanical behaviour and fracture toughness of unfilled and short fibre filled polypropylene both drawn and undrawn. Experimental investigation the effect of fibre content and draw ratio on the mechanical properties of unfilled and short glass fibre filled polypropylene

      Caton-Rose, Philip D.; Alkoles, Omar M.S. (University of BradfordSchool of Engineering, Design and Technology, 2013-03-12)
      The goal of this research is to investigate the combined effects of glass fibre reinforcement and molecular orientation in polypropylene-short glass fibre composites. Specimens have been fabricated using the injection moulding process and drawn using a small die drawing rig. The effects of die drawing on the fibre composites are complex, with the drawing process orienting both the polymer molecules and the glass fibres. This may be accompanied by the creation of voids in the polymer matrix and their destruction in the compressive stress field thus restoring the interfacial contact area between fibre and matrix. Unfilled and short glass fibre filled polypropylene specimens, with fibre content 7% wt, 13%wt, 27%wt, and 55%wt, were injection moulded prior to the die drawing process. An experimental program of die drawing within an oven at elevated temperature was conducted for polypropylene filled to various levels and at different strain rates. The specimens drew to draw ratios in the range ¿=1.41 to ¿=5.6. Mechanical characterization of the test materials has been conducted by examining the tensile stress strain and fracture behaviour under uniaxial conditions. The influence of glass fibre content and drawing conditions (draw ratio) on the fracture toughness and crack propagation was investigated using the double edge notched fracture test. The notch lengths ranged from 1.5 to 2.5 mm for 10 mm wide specimens. The critical stress intensity factor increased as the fibre content increased up to a limiting filler level. The fracture toughness of both unfilled and fibre filled polypropylene were found to be highly dependent on draw ratio. The results were analysed to find out the optimal draw ratio and fibre content that yielded the maximum modulus, strength and fracture toughness. Data showed that, at a given draw ratio, modulus, strength and fracture toughness increased with increasing fibre content to a maximum and then decreased. The optimum material was obtained at a draw ratio of 2.5 and filler loading 13wt%.
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