Mesoscopic investigation of layered graded metallic foams under dynamic compaction

Zhang, Jinhua; Zhang, Yadong; Fan, Junyu; Fang, Qin; Long, Yuan

doi:10.1177/1369433218766941

Cited by 5 publications

(4 citation statements)

References 48 publications

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“…It is challenging to calculate the effects of DC because of its dynamic characteristics. Therefore, recent research on DC has primarily focused on tests and simulations [2,[11][12][13]. For engineering design or control aspects, a simple calculation method is still needed.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Modeling of Ground Displacement Induced by Dynamic Compaction in Granular Soils

Zhang

et al. 2023

Buildings

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Dynamic compaction (DC) is a ground treatment method that achieves soil densification effects using impact forces. The ground displacement of a crater induced by a hammer is often used for the determination of densification, but less attention has been paid to internal displacement in the ground. To establish an overall understanding of the displacements caused by DC, a laboratory experiment was conducted with sand. The experiment included four energy levels by changing the falling height of the hammer. Meanwhile, a calculation model based on stochastic media theory was proposed to calculate the displacement in the soil. The relationship between the geometric characteristics of the crater and the internal displacement of the soil was established in the model based on the experimental results. The ranges of the relevant parameters were determined, and the feasibility of the calculation model was verified. The model showed good consistency with the experimental data. By selecting the critical settlement, the model could be used to estimate the specific densification scope, including the reinforcement depth and radius. This method can provide a reference for the calculation and optimization of DC.

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Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Modeling of Ground Displacement Induced by Dynamic Compaction in Granular Soils

Zhang

et al. 2023

Buildings

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“…Concrete structures are more likely to be destroyed under the dynamic load, and the casualties and property losses are also more serious [4,5]. To make concrete structures safe, some scholars have researched improving the dynamic mechanical properties of concrete structures [6][7][8]. It has been shown that metal foams with good impact resistance [9,10] are often used as a protective layer of structures.…”

Section: Introductionmentioning

confidence: 99%

Research and Statistical Analysis on Impact Resistance of Steel Fiber Expanded Polystyrene Concrete and Expanded Polystyrene Concrete

Huo

Zhang

2022

Materials

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Steel fiber foamed concrete (SFFC) combines the impact resistance of steel fiber concrete (SFC) and the energy absorption characteristics of foamed concrete (FC), and it has brought attention to the impact field. Using the mechanical properties of SFFC expanded polystyrene concrete, we prepared (EPSC) specimens with 10%, 20%, 30%, 40%, 50% by volume of expanded polystyrene (Veps), and steel fiber expanded polystyrene concrete (SFEPSC) specimens by adding 1% steel fiber (SF) based on the EPSC in this study. The relationship between compressive strength, the Veps and apparent density was revealed. The relationship between the first crack and the ultimate failure impact of SFEPSC specimens was obtained by a drop-weight test. The impact resistance of SFEPSC and EPSC and the variation law of Veps were studied by mathematical statistics. The log-normal and the two-parameter Weibull distributions were used to fit the probability distribution of impact resistance of the SFEPSC and EPSC specimens. Finally, both types of specimens’ destruction modes and mechanisms were analyzed. The mechanism of the EPS particles and the SFs dissipating impact load energy was analyzed from the energy point of view.

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“…25 Most of the previous studies have focused on the introduction of a proprietary gradient that can vary the general response of FGM structures with certain optimization of the arrangement of the gradient profiles. From a theoretical study's perspective, some constitutive models have recently been reported in the literature to model the behavior of layered graded foams under quasi-static and impact loading, such as the mesoscopic model; 26 shock model; 27 elastic, collapse, plastic-hardening, densification constitutive model; 28 and elastic, plastic-hardening, locking model. 29 The aim of this study is to provide insights into the impact perforation of sandwich panels made of 0.8 mm 2024-T3 aluminum alloy skin sheets and graded polymeric hollow sphere cores.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of the impact perforation of sandwich panels with graded hollow sphere cores

Elnasri

Zhao

2021

Advances in Mechanical Engineering

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In this study, we numerically investigate the impact perforation of sandwich panels made of 0.8 mm 2024-T3 aluminum alloy skin sheets and graded polymeric hollow sphere cores with four different gradient profiles. A suitable numerical model was conducted using the LS-DYNA code, calibrated with an inverse perforation test, instrumented with a Hopkinson bar, and validated using experimental data from the literature. Moreover, the effects of quasi-static loading, landing rates, and boundary conditions on the perforation resistance of the studied graded core sandwich panels were discussed. The simulation results showed that the piercing force–displacement response of the graded core sandwich panels is affected by the core density gradient profiles. Besides, the energy absorption capability can be effectively enhanced by modifying the arrangement of the core layers with unclumping boundary conditions in the graded core sandwich panel, which is rather too hard to achieve with clumping boundary conditions.

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Mesoscopic investigation of layered graded metallic foams under dynamic compaction

Cited by 5 publications

References 48 publications

Experimental and Analytical Modeling of Ground Displacement Induced by Dynamic Compaction in Granular Soils

Experimental and Analytical Modeling of Ground Displacement Induced by Dynamic Compaction in Granular Soils

Research and Statistical Analysis on Impact Resistance of Steel Fiber Expanded Polystyrene Concrete and Expanded Polystyrene Concrete

A numerical study of the impact perforation of sandwich panels with graded hollow sphere cores

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