Abstract
In this paper, a novel implementation of the Lattice Discrete Element Method (LDEM) is proposed: in particular, the LDEM is implemented in the Ansys LS-DYNA finite element code. Such an implementation is employed to evaluate the fracture behaviour of sandwich panels under bending. First, the novel hybrid model proposed is validated by simulating some three-point bending experimental tests carried out at the University of Parma, and then it is used to model the fracture behaviour of sandwich panels under four-point bending. Failure mechanisms, damage locations, and load-deflection curves are numerically determined by employing such a novel model, and the results show a good agreement with the available experimental findings.
Highlights
Lattice Discrete Element Method Description In Lattice Discrete Element Method (LDEM), the continuum medium is represented by a cubic arrangement of trusses in which the total mass is concentrated at the nodes [29]
Note that sandwich panels subjected to bending loading may be characterised by various failure modes, depending on the geometry of the panel, the properties of the constituent materials and the loading condition [62]
Skin buckling may appear at the top compressed side of the panel and is typical of sandwich panels with a foam core
Summary
Three different categories of composite materials may be distinguished [2]: fibrereinforced materials, particle-reinforced materials, and layered materials To both fibre-reinforced and particle-reinforced materials, one or more types of fibres or particles (reinforcing phase) are employed in order to improve either mechanical or physical properties of a specific base material (matrix). Sandwich panels are noteworthy as they are generally light, with excellent properties in terms of load-bearing capacity, thermal and acoustic insulation, and waterproofing. They consist of a soft, thick core between two thin sheets held together by means of adhesive layers.
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