Finite element modelling of composite materials and structures

Matthews, F. L.; Davies, G. A. O.; Hitchings, D.; Soutis, C.

doi:10.1533/9781855738928

Cited by 62 publications

(106 citation statements)

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“…First, it requires the structure to be dimensionally reduced to a surface, which could be a complex task in itself [22]. Even if the structure is successfully reduced, modeling an assembly of multiple plates and shells can be problematic [6]. In addition, due to dimensional reduction, 2D FEA can sometimes completely miss a 3D phenomenon.…”

Section: Two-dimensional Feamentioning

confidence: 99%

“…As a compromise, several hybrid methods that incorporate two-dimensional plate and shell behaviors in 3D FEA have been proposed. For example, Solid-shell elements are 3D elements that use Assumed Natural Strain method to deform like plates and shells [6,24]. Their three dimensional nature is well suited for interfacing with other solid elements in assemblies.…”

Section: Three-dimensional Feamentioning

confidence: 99%

“…The presence of numerous plies, however, leads to complex geometry and material distribution in laminate structures, and, therefore, structural analysis of laminates by treating each ply layer individually is prohibitively expensive. The common practice is to assume that the layers are permanently fused together and ignore any fluctuation in stress-strain fields at the interfaces of layers [4,3,5,6]. These assumptions allow to approximate laminate's global behavior as that of a plate or a shell.…”

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Efficient 3D analysis of laminate structures using ABD-equivalent material models

Kumar

Shapiro

2015

Finite Elements in Analysis and Design

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Laminate composites are widely used in automotive, aerospace, and increasingly in consumer industries, due to their reduced weight and superior structural properties. However, structural analysis of complex laminate structures remains challenging. 2D finite element methods based on plate/shell theories may be accurate and efficient, but they generally do not apply to the whole structure and require identification and preprocessing of the regions where the underlying assumptions hold. Fully automated structural analysis using solid 3D elements with sufficiently high order basis functions is possible in principle, but is rarely practiced due to the significant increase in the cost of computational integration over a large number of laminate plies.We propose a procedure to replace the original laminate by much simpler new virtual material models. These virtual material models, under the usual assumptions made in lamination theory, have the same constitutive relationship as the corresponding 2D plate model of the original laminate, but require only a small fraction of computational integration costs in 3D FEA. We describe implementation of 3D FEA using these material models in a meshfree system using second order B-spline basis functions. Finally, we demonstrate their validity by showing agreement between computed and known results for standard problems. Figure 1: Figure shows a structure made of 3 laminates analyzed using different finite element methods (a) Plate/shell element (b) Element of 3D conforming mesh (c) Element of a 3D non-conforming mesh (d) Element of a non-conforming mesh with curved laminate inside.to fully automatic, are generally parallel and unidirectional and, therefore, result in plies which are anisotropic in nature. Material properties are customized by varying fiber angle within each ply, controlling the number of plies, and adding additional materials between plies such as cores and fillers. The presence of numerous plies, however, leads to complex geometry and material distribution in laminate structures, and, therefore, structural analysis of laminates by treating each ply layer individually is prohibitively expensive. The common practice is to assume that the layers are permanently fused together and ignore any fluctuation in stress-strain fields at the interfaces of layers [4,3,5,6]. These assumptions allow to approximate laminate's global behavior as that of a plate or a shell. Interlaminar stresses and strains may be significant in boundary regions and regions of discontinuities [7] where full three-dimensional and/or layered methods should be used, but the plate/shell assumptions give sufficiently accurate stress and strain estimates for regions away from those regions [8].In this paper, we will show that the same plate/shell assumptions, when applicable, may be used within a general 3D finite element analysis to dramatically speed up the analysis procedure.Structural analysis of laminates can be carried out using different finite element methods, and some of them are illustrated for ...

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Section: Two-dimensional Feamentioning

confidence: 99%

Section: Three-dimensional Feamentioning

confidence: 99%

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confidence: 99%

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Efficient 3D analysis of laminate structures using ABD-equivalent material models

Kumar

Shapiro

2015

Finite Elements in Analysis and Design

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“…Typically, for composites, we shall need moduli and strength of the single plies that constitute a laminate. Occasionally we may input the laminate properties directly [11].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Behavior of CFRP Strengthened Concrete Beams and Columns at Different Temperatures

Gawil

Elarbi

2020

Fibers

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The bonding of thin fiber-reinforced plastics (FRP) composites on the surface of concrete members has emerged as an effective method to increase both the strength and stiffness of concrete members. Although a large volume of experimental and numerical research has performed on existing concrete structures to increase their load carrying capacity, there appears to be less work reported on simulating the influence of temperature on the behavior of concrete structures. This study intends to examine the effects of changing temperature on the mechanical properties of FRP composites as well as deteriorated composites on the structural performance of FRP bonded concrete structures. The overall approach consists of computations using finite element models to simulate the structural behavior of FRP bonded beams and columns. Three-dimensional-extended finite element modeling X-FEM using ABAQUS-CAE v.6.13 program was performed to explore the influence of temperature of (25 • C, 100 • C and 180 • C) on failure loads of FRP strengthened beams and columns with adhesive material. Additionally, the cohesive traction-separation damage model was use to model the delamination of FRP from the concrete. The flexural strength, mid-span deflection, crack patterns, failure loads, and mode of failure for the tested models were compared with the previous experimental study. The results show that a FEM results were in good agreement with experimental results. The flexural strength decreases with temperature rise for FRP strengthened concrete beams. The high temperature 180 • C has an adverse influence on the compressive strength of the specimens. The way of FRP rupture in the simulation was similar to the mode that was observed during the experimental tests.

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“…The nonlinear behaviour of laminar composites can further result from delamination. As a consequence, composites fail in an extremely complicated manner [4] (in contrast to homogeneous isotropic materials, the fracture of which occurs by the propagation of a single macroscopic crack [5]), so that classical fracture mechanics is not applicable to modelling failure behaviour in composites. Various macroscopic and microscopic approaches have been proposed for failure modelling [6,7 and references therein] but, due to the complexity of the systems, they mainly focus on simply structured laminates such as unidirectional or cross-ply laminates under a specified set of uni-axial tests, leaving the prediction of failure behaviour of complicated laminates such as angle-ply composites under various loading conditions as a further issue.…”

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A Continuum Approach for Identifying Elastic Moduli of Composites

Michopoulos

Furukawa

Fracture of Nano and Engineering Materials and Structures

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Composite materials can be tailored to meet specific needs such as high strength and stiffness combined with low weight [1], which are not achievable by metallic and other materials. Recent past decades have seen the accelerated use of composite materials in structural components due to cost reductions. The performance of a composite structure is, however, highly sensitive to the mechanical behaviour of the composite material. As the expectation of structural performance becomes more demanding, the need for reliable prediction of the mechanical behaviour of composite materials has become ever more important [2].

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Finite element modelling of composite materials and structures

Cited by 62 publications

References 0 publications

Efficient 3D analysis of laminate structures using ABD-equivalent material models

Efficient 3D analysis of laminate structures using ABD-equivalent material models

Modeling the Behavior of CFRP Strengthened Concrete Beams and Columns at Different Temperatures

A Continuum Approach for Identifying Elastic Moduli of Composites

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