Finite element modelling of the actual structure of cellular materials determined by X-ray tomography

Youssef, S.; Maire, Éric; Gaertner, Roger

doi:10.1016/j.actamat.2004.10.024

Cited by 293 publications

(200 citation statements)

References 20 publications

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“…The reconstruction of the structure is often supported by X-ray tomography [55][56][57][58][59][60] and relies on analytical approaches (for example by Zsoldos et al [61]). Bardella and Genna published papers on the determination of the elastic properties of syntactic foams [62][63][64].…”

Section: Introductionmentioning

confidence: 99%

Compressive behaviour of aluminium matrix syntactic foams reinforced by iron hollow spheres

et al. 2015

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HighlightsLow pressure infiltration is suitable to produce MMSFs with hollow iron spheres.The MMSFs showed plastic yielding and long, slowly ascending plateau region.The matrix and the heat treatment strongly influence the properties of the MMSFs.The full-scale FEM model gives excellent agreement compared to the measured values. Highlights (for review) *Manuscript Click here to view linked References AbstractAluminium alloy syntactic foams reinforced with iron hollow spheres were produced by low pressure, liquid phase inert gas infiltration technique. Four Al alloys (Al99.5, AlSi12, AlMgSi1 and AlCu5) and Globomet grade iron hollow spheres were used as matrix and reinforcing material, respectively. The produced composite blocks were characterised according to the ruling standard for compression of cellular materials in order to ensure full comparability. The compressive test results showed plastic yielding and a long, slowly ascending plateau region that ensures large energy absorption capability. The proper selection of the matrix material and the applied heat treatment allows for a wide range of tailoring of the mechanical properties. For design purposes, the full-scale finite element method (FEM) model of the investigated foams was created and tested on Al99.5 matrix foams. The FEM results showed very good agreement with the measured values (typically within 5% in the characteristic properties and within 10% for the whole compression curve).

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Section: Introductionmentioning

confidence: 99%

Compressive behaviour of aluminium matrix syntactic foams reinforced by iron hollow spheres

et al. 2015

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“…However, during the compression tests, the PP foamed specimens collapse with negligible Poisson ratio's effect as reported by Zhang et al (1998). As a result, although the local state can be different (Youssef et al, 2005;Ryu et al, 2005), the effect of the friction conditions on the overall stress-strain response can be neglected compared to the response discrepency between the different specimen responses, see the results here below. The resulting uniaxial compressive curves of the nanocomposite foams are presented in Fig.…”

Section: Uniaxial Compression Tests Of Pp/cnts Nanocomposite Foamsmentioning

confidence: 63%

Experimental and computational micro-mechanical investigations of compressive properties of polypropylene/multi-walled carbon nanotubes nanocomposite foams

Wan¹,

Tran

Leblanc

et al. 2015

Mechanics of Materials

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The compressive behavior of nanocomposite foams is studied by both experimental and computational micro-mechanics approaches with the aim of providing an efficient computational model for this kind of material.The nanocomposites based on polypropylene (PP) and different contents of multi-walled carbon nanotubes (CNTs) method. The nanocomposite samples are foamed using super-critical carbon dioxide (ScCO 2 ) as blowing agent at different soaking temperatures. The influence of this foaming parameter on the morphological characteristics of the foam micro-structure is discussed. Differential Scanning Calorimetry (DSC) measurements are used to quantify the crystallinity degree of both nanocomposites and foams showing that the crystallinity degree is reduced after the foaming process. This modification leads to mechanical properties of the foam cell walls that are different from the raw nanocomposite PP/CNTs material. Three-point bending tests are performed on the latter to measure the flexural modulus in terms of the crystallinity degree. Uniaxial compression tests are then performed on the foamed samples under quasi-static conditions in order to extract the macro-scale compressive response. Next, a two-level multi-scale approach is developed to model the behavior of the foamed nanocomposite material. On the one hand, the micromechanical properties of nanocomposite PP/CNTs cell walls are evaluated from a theoretical homogenization model accounting for the micro-structure of the semi-crystalline PP, for the degree of crystallinity, and for the CNT volume fraction. The applicability of this theoretical model is demonstrated via the comparison with experimental data from the described experimental measurements and from literature. On the other hand, the macroscopic behavior of the foamed material is evaluated using a computational micromechanics model using tetrakaidecahedron unit cells and periodic boundary conditions to estimate the homogenized properties. The unit cell is combined with several geometrical imperfections in order to capture the elastic collapse of the foamed material. The numerical results are compared to the experimental measurements and it is shown that the proposed unit cell computational micro-mechanics model can be used to estimate the homogenized behavior, including the linear and plateau regimes, of nanocomposite foams.

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“…This technique of analysis is called as image-based finite element analysis. Many applications of this approach for reconstruction of FE mesh are found in the area of biomechanics, metal matrix composite, foam, and cement paste (Magne (2006), Wolodko (2000), Youssef (2005), Hain (2008)). …”

Section: Introductionmentioning

confidence: 99%

Finite element analysis for mechanical characterization of 4D inplane carbon/carbon composite with imperfect microstructure

Sharma

Bhagat

Mahajan

2014

Lat. Am. j. solids struct.

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Finite element mesh of multi-directional 4D carbon/carbon (C/C) composite was reconstructed from 2D images obtained by X-ray tomography. Thus, imperfections in the composite such as voids, misalignment and cross-section distortion of the fibre bundles were directly incorporated in the finite element mesh. 2D images of the composite were also used for the characterization of the porosity in the composite. The effect of these micro structural imperfections was studies by assuming perfect bonding at the bundle/matrix interface. The initial mechanical properties of the composite were obtained from unit cell analysis using asymptotic homogenization and moduli in x, y and z directions were 39, 25 and 44 GPa. However, matrix and bundle/matrix interfacial cracks were also clearly visible in the X-ray tomographic images. Later, the effects of debonding was incorporated by using frictional cohesive interaction at bundle/matrix interfaces and matrix cracking was modeled by degrading the elastic properties of matrix. Final, the response of the composite was studied under six individual load cases.

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Finite element modelling of the actual structure of cellular materials determined by X-ray tomography

Cited by 293 publications

References 20 publications

Compressive behaviour of aluminium matrix syntactic foams reinforced by iron hollow spheres

Compressive behaviour of aluminium matrix syntactic foams reinforced by iron hollow spheres

Experimental and computational micro-mechanical investigations of compressive properties of polypropylene/multi-walled carbon nanotubes nanocomposite foams

Finite element analysis for mechanical characterization of 4D inplane carbon/carbon composite with imperfect microstructure

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