DIKUL - logo
(UL)
  • Behaviour and optimisation of multi-directional laminate specimens under delamination by bending = Vedenje in optimizacija večsmernih vzorcev laminatov pri upogibu z delaminacijo
    Ouali, Nourdine ...
    This work forms part of a study of the behaviour and characterisation of a ( q) multi-directional glass/epoxy composite loaded in modes I and II by bending. For the mode I loading the tests were ... performed on double cantilever beam (DCB) specimens. These tests resulted in two types of delamination: delamination in the median plan for the low angles (q L 33.5°) and a delamination in staircases for the high angles (33.5° L q L 67.5°). The delamination in staircases creates an unsymmetrical specimen that generates a shear effort in the crack tip and the loading can no longer be considered as pure mode I, but rather a mixed mode (I + II) and sometimes mode (I + II + III). The starting-energy release rate and the propagation energy are often difficult to characterise for these materials, because the start of the delamination is preceded by a transverse cracking of the most tensed plies if the specimen test thickness is relatively weak, and in the propagation phase, the delamination is accompanied by a large rate of transversal cracks. For the low angles, exposed fibres and imprints of fibres is the aspect that dominates the fracture surfaces. Occasional broken fibres and cusps at the intersections of the plan of the rupture with the wefts were also observed. For the large angles, the number of broken fibres is more important than in the case of low angles. A thickness optimisation of the DCB specimen was made in order to avoid the appearance of transverse cracking before the start of the delamination.
    Vir: Materiali in tehnologije = Materials and technology. - ISSN 1580-2949 (Letn. 40, št. 5, 2006, str. 199-205)
    Vrsta gradiva - članek, sestavni del
    Leto - 2006
    Jezik - angleški
    COBISS.SI-ID - 577450

    Povezava(-e):

    Digitalna knjižnica Slovenije - dLib.si

Vnos na polico