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

Sun, Yongle; Li, Q.M.; Lowe, Tristan; McDonald, S.A.; Withers, Philip J.

doi:10.1016/j.matdes.2015.09.109

Cited by 84 publications

(32 citation statements)

References 46 publications

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“…Firstly, when an optimal cutting is performed, the roughness and damage of the cut surface can be minimised and then the compressive properties of the end-surface layer will approach those of the main body. This has been confirmed by simulation of ideal compression of Alporas foam using 3D cell-based models (Sun et al, 2016a;Sun et al, 2016b). Secondly, although the two end-surface layers that are produced by a cutting process possess relatively low elastic modulus and yield strength, they exhibit fast stiffening and hardening during the establishment of the contact between the loading platen and foam sample.…”

Section: Accepted Manuscriptmentioning

confidence: 62%

Cutting-induced end surface effect on compressive behaviour of aluminium foams

Meng

Chai²,

Sun

et al. 2019

European Journal of Mechanics - A/Solids

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Three cutting methods, i.e. electrical discharge machining (EDM), band saw (BS) and water jet (WJ), were used to prepare cuboid samples of closed-cell aluminium Alporas foam. On the end surfaces of the prepared samples, local roughness of mesoscopic structural components (i.e. cell wall, node and facet) and global roughness for the entire cut surface were measured using confocal microscopy. Furthermore, quasi-static uniaxial compression tests were performed with intermittent unloading-reloading. In the initial stage of compression, the measured loading stiffness and unloading elastic modulus are highest, intermediate and lowest for the EDM-cut, BS-cut and WJ-cut samples, respectively. This difference in measured compressive properties has been correlated with the difference in end-surface roughness associated with different cutting methods. However, the peak and plateau of compressive stress and the unloading elastic modulus in the plateau stage are insensitive to cutting method. An analytical model has been developed to elucidate the observed compressive behaviour and shed light on the responsible mechanisms.

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Section: Accepted Manuscriptmentioning

confidence: 62%

Cutting-induced end surface effect on compressive behaviour of aluminium foams

Meng

Chai²,

Sun

et al. 2019

European Journal of Mechanics - A/Solids

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“…A cell-based approach also confirmed deformation localisation at higher strain rates [29]. Computational studies of closed-cell aluminium foam and cell-based Voronoi lattice dynamic behaviour showed relationships between the cell geometry and loading rate [30,31]. The behaviour of closed-cell foams can be successfully described by homogenised computational models, i.e., crushable foam material models, which were successfully applied for polymeric, auxetic and aluminium foam core of composite panels under different loading conditions [32][33][34].…”

Section: Introductionmentioning

confidence: 71%

Compressive Behaviour of Closed-Cell Aluminium Foam at Different Strain Rates

et al. 2019

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Closed-cell aluminium foams were fabricated and characterised at different strain rates. Quasi-static and high strain rate experimental compression testing was performed using a universal servo-hydraulic testing machine and powder gun. The experimental results show a large influence of strain rate hardening on mechanical properties, which contributes to significant quasi-linear enhancement of energy absorption capabilities at high strain rates. The results of experimental testing were further used for the determination of critical deformation velocities and validation of the proposed computational model. A simple computational model with homogenised crushable foam material model shows good correlation between the experimental and computational results at analysed strain rates. The computational model offers efficient (simple, fast and accurate) analysis of high strain rate deformation behaviour of a closed-cell aluminium foam at different loading velocities.

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“…The maximal cracking width and penetration depth of the stitched samples decrease compared to unstitched ones, which means the stitched sandwiches are able to bear a greater impact load and appear to have lower impact damage . It is quite different for the mechanical behaviors of the foam core sandwiches under quasi‐static loads and shock wave loads . The unstitched and stitched foam also behave differently under blast loading.…”

Section: Innovative Foam Sandwichmentioning

confidence: 96%

Sandwich Structures with Prismatic and Foam Cores: A Review

Xiong

Mousanezhad³

et al. 2018

Adv Eng Mater

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This article provides a comprehensive review of recent research efforts on the development and characterization of sandwich structures with corrugated, honeycomb, and foam cores. The topics discussed in this review article include aspects of core-face bonding and reinforcement, enhancement of core mechanical properties and panel performance (including the role of structural hierarchy), and multifunctional advantages offered by different core constructions. In addition, the review discusses potential applications, including in morphing wing design, impact resistance, and ultralightweight applications. Future research directions are discussed.

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

Cited by 84 publications

References 46 publications

Cutting-induced end surface effect on compressive behaviour of aluminium foams

Cutting-induced end surface effect on compressive behaviour of aluminium foams

Compressive Behaviour of Closed-Cell Aluminium Foam at Different Strain Rates

Sandwich Structures with Prismatic and Foam Cores: A Review

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