Modelling investigation of fracture behaviour of composite sandwich panel in bridge structure

Huang, Bingzhang (2015) Modelling investigation of fracture behaviour of composite sandwich panel in bridge structure. MSc dissertation, University of Portsmouth.

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    Nowadays, sandwich composite panel which is one of the new functional structural materials has been widely used in various fields, such as, aviation, aerospace, transportation and construction engineering structures. And, it not only have the mechanical characteristics of high bending stiffness and lightweight, but also have the functionality of noise absorption, energy absorption, thermal control. However, due to the mismatch of feature panels and core material properties during manufacture and service, it will inevitably have cracks, damages and other defects in its core and surface, thereby it reduces its carrying-capacity. In this view, this dissertation studies the fracture mode of composite panels in bridge structure by using the finite element modelling with cohesive element.
    ABAQUS software is selected as the tool to model the sandwich panel which is composed of three main layers and two cohesive element layers. In the dissertation, there are two models of displacement loading (from 0 to 40mm and 0 to 120mm). In every model, there are several steps as follow, defining dimensions of the model, setting every material parameter in the model, setting the damage norms of cohesive element, setting the boundary conditions and the displacement loading. After modelling, then we can obtain the result of the stress and strain which is shown by the stress and delamination cloud in 3D and the specific value and the changing rule in the different displacement load.
    By the results, the conclusions can be summarized as follow: Firstly, choosing the better compression strength of core material can increase the carrying capacity of structure; secondly, delamination can give rise to the deformation and complete destabilization of model; thirdly, even though the cohesive element of surface can withstand tensile and shear strain, it does not produce any stress. At last and the most important, enhancing connection between different materials can not only improve the bearing capacity, stability and safety of structure, but also can reduce delamination.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 13 Nov 2015 14:46
    Last Modified: 13 Nov 2015 14:46

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