Mesoscopic investigation of closed-cell aluminum foams on energy absorption capability under impact

Fang, Qin; Zhang, Jinhua; Zhang, Yadong; Liu, Jinchun; Ziming, Gong

doi:10.1016/j.compstruct.2015.01.001

Cited by 58 publications

(22 citation statements)

References 37 publications

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“…Figure a–e show the equivalent stress distribution nephograms of 92.0%–5PPI copper foam during compression simulation at strains of 0, 4, 15, 35, and 60%.The stress at the struts is higher than that at the nodes . With increasing strain, the stress concentrations become more severe.…”

Section: Results and Analysismentioning

confidence: 98%

Study on the Compression Properties and Deformation Failure Mechanism of Open‐Cell Copper Foam

Chen

Xiong-fei

et al. 2017

Adv Eng Mater

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Uniaxial compression experiments on open-cell copper foams are conducted at strain rates of 10 À2 s À1 , 10 À3 s À1 , and 10 À4 s À1 to obtain the true stress-strain curves. The effects of the strain rate, cell size, and porosity on the mechanical properties is studied. The deformation mechanism of the open-cell copper foams is investigated by experimental research and finite element analysis. The results showed that the compression strength, Young's modulus and yield strength increase with increasing strain rate and decreasing porosity and cell size. A lower strain rate results in higher strain sensitivity. Strainhardening behavior occurred in the process of high-strain-rate loading. The experimental and simulation results indicate that the failure mechanism of the open-cell copper foam is the layer-by-layer collapse failure mechanism and that stress concentrations form easily at the weak pore struts. The simulation results are consistent with the experimental data at the first and second stages. However, the value of true stress predicted by the simulation at the third stage is slightly higher than that of the experiments.

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Section: Results and Analysismentioning

confidence: 98%

Study on the Compression Properties and Deformation Failure Mechanism of Open‐Cell Copper Foam

Chen

Xiong-fei

et al. 2017

Adv Eng Mater

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“…The effective strain evolution in the micro-scale FE model of specimen N15 during impact is shown in Figure 10. The simulation results showed that the damage is extended to the whole specimen and one or two failure bands were formed (however, in higher strain rates, the cells start to collapse right below the drop weight [18,35,36]). …”

Section: Validation Of the Micro-scale Fe Modelsmentioning

confidence: 99%

“…The influences of porous structure density and strain-rate on the dynamic responses of aluminum foam using micro-mechanical models was carried out by Liu et al [17] using two-dimensional models. Fang et al [18] used a mesoscopic method to model closed-cell aluminum foams with variable pore and wall thickness dimensions.…”

Section: Introductionmentioning

confidence: 99%

CT-Based Micro-Mechanical Approach to Predict Response of Closed-Cell Porous Biomaterials to Low-Velocity Impact

et al. 2018

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Abstract:In this study, a new numerical approach based on CT-scan images and finite element (FE) method has been used to predict the mechanical behavior of closed-cell foams under impact loading. Micro-structural FE models based on CT-scan images of foam specimens (elastic-plastic material model with material constants of bulk aluminum) and macro-mechanical FE models (with crushable foam material model with material constants of foams) were constructed. Several experimental tests were also conducted to see which of the two noted (micro-or macro-) mechanical FE models can better predict the deformation and force-displacement curves of foams. Compared to the macro-structural models, the results of the micro-structural models were much closer to the corresponding experimental results. This can be explained by the fact that the micro-structural models are able to take into account the interaction of stress waves with cell walls and the complex pathways the stress waves have to go through, while the macro-structural models do not have such capabilities. Despite their high demand for computational resources, using micro-scale FE models is very beneficial when one needs to understand the failure mechanisms acting in the micro-structure of a foam in order to modify or diminish them.

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“…The change of the deformation mode and high strain rate hardening was also observed in computational simulations of metallic foams. Mesoscopic computational simulations were performed using µCT scan based geometrical models [24,27]. The Arbitrary Lagrange Eulerian (ALE) method was also applied to take into account the entrapped air inside the closed-cell foam [28].…”

Section: Introductionmentioning

confidence: 99%

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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Mesoscopic investigation of closed-cell aluminum foams on energy absorption capability under impact

Cited by 58 publications

References 37 publications

Study on the Compression Properties and Deformation Failure Mechanism of Open‐Cell Copper Foam

Study on the Compression Properties and Deformation Failure Mechanism of Open‐Cell Copper Foam

CT-Based Micro-Mechanical Approach to Predict Response of Closed-Cell Porous Biomaterials to Low-Velocity Impact

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

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