Effect of entrapped gas on the dynamic compressive behaviour of cellular solids

Sun, Yongle; Li, Q.M.

doi:10.1016/j.ijsolstr.2015.02.034

Cited by 40 publications

(34 citation statements)

References 37 publications

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“…The strain‐rate effect on densification strain is not significant when the strain rate increases from 0.0016 to 0.016 s −1 in all cases; however, a reduction of around 10% is observed when the strain rate increases from 0.0016 to 150 s −1 for both PUF and BNCF in the longitudinal direction. This may be explained by the entrapped gas effect on polymer foams . It is noted that the densification strain could not be measured accurately in the transverse direction from the dynamic compression curves for both foams.…”

Section: Resultsmentioning

confidence: 99%

“…This may be explained by the entrapped gas effect on polymer foams. 71 It is noted that the densification strain could not be measured accurately in the transverse direction from the dynamic compression curves for both foams. It can also be seen in Figure 4(a,c) that there is a drop in the engineering stress at around 0.6 engineering strain for the PUF and BNCF, respectively, in the longitudinal direction for a strain rate of 150 s −1 .…”

Section: Synthesismentioning

confidence: 96%

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Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates

Chiacchiarelli

Cerrutti

Flores‐Johnson

2019

J of Applied Polymer Sci

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Nanocellulose reinforced foams are lightweight with improved mechanical properties; however, the strain‐rate effect on their mechanical response is not yet fully understood. In this work, rigid polyurethane foams (PUFs) nanostructured with bacterial nanocellulose at 0.2 wt % (BNCF) and without it (PUF) are synthesized and subjected to compression tests at different strain rates. The BNC acts as a nucleation agent, reducing the cell size but maintaining a similar apparent density of 40.4 ± 3.3 kg m−3. Both BNCF and PUF exhibit strain‐rate effect on yield stress and densification strain. The BNCF exhibits localized progressive crushing and reduced friability, causing a remarkable recovery in the transverse direction. Numerical simulations show that functionally graded foams subjected to impact could be designed using different layers of PUF and BNCF to vary energy absorption and acceleration rate. The results presented herein warrant further research of the mechanical properties of nanostructured foams for impact applications. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 137, 48701.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesismentioning

confidence: 96%

Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates

Chiacchiarelli

Cerrutti

Flores‐Johnson

2019

J of Applied Polymer Sci

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“…In comparison with idealised cell structures such as regular hexagonal-cell and circular-cell honeycombs [38] and random Voronoi foams [27], the 2D foam model based on the cross-sectional geometry of an actual foam has advantages owing to its capability of incorporating a realistic cell structure. This is important for establishing structure-property relationships for real cellular materials.…”

Section: Introductionmentioning

confidence: 99%

Image-based correlation between the meso-scale structure and deformation of closed-cell foam

Sun

Zhang

Shao

et al. 2017

Materials Science and Engineering: A

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In the correlation between structural parameters and compressive behaviour of cellular materials, previous studies have mostly focused on averaged structural parameters and bulk material properties for different samples. This study focuses on the meso-scale correlation between structure and deformation in a 2D foam sample generated from a computed tomography slice of Alporas TM foam, for which quasi-static compression was simulated using 2D image-based finite element modelling. First, a comprehensive meso-scale structural characterisation of the 2D foam was carried out to determine the size, aspect ratio, orientation and anisotropy of individual cells, as well as the length, straightness, inclination and thickness of individual cell walls. Measurements were then conducted to obtain the axial distributions of local structural parameters averaged laterally to compression axis. Second, the meso-scale deformation was characterised by cell-wall strain, cell area ratio, digital image correlation strain and local compressive engineering strain. According to the results, the through-width sub-regions over an axial length between the average (lower bound) and the maximum (upper bound) of cell size should be used to characterise the meso-scale heterogeneity of the cell structure and deformation. It was found that the first crush band forms in a sub-region where the ratio of cell-wall thickness to cell-wall length is a minimum, in which the collapse deformation is dominated by the plastic bending and buckling of cell walls. Other 2 morphological parameters have secondary effect on the initiation of crush band in the 2D foam.The finding of this study suggests that the measurement of local structural properties is crucial for the identification of the "weakest" region which determines the initiation of collapse and hence the corresponding collapse load of a heterogeneous cellular material.

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“…collapse stress) of aluminium foams according to the previous analytical estimate [2,14] and numerical simulation [42,43]. The gas effect could be significant at the densification stage [42,43] or when the initial gas pressure is much higher than atmosphere pressure [44,45].…”

Section: Accepted Manuscriptmentioning

confidence: 93%

Investigation of strain-rate effect on the compressive behaviour of closed-cell aluminium foam by 3D image-based modelling

Sun

Lowe

et al. 2016

Materials & Design

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Effect of entrapped gas on the dynamic compressive behaviour of cellular solids

Cited by 40 publications

References 37 publications

Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates

Compressive behavior of rigid polyurethane foams nanostructured with bacterial nanocellulose at low and intermediate strain rates

Image-based correlation between the meso-scale structure and deformation of closed-cell foam

Investigation of strain-rate effect on the compressive behaviour of closed-cell aluminium foam by 3D image-based modelling

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