Effect of loading rate on the compressive properties of open-cell metal foams

Li, Zhiqiang; Xi, C.Q.; Jing, Lin; Wang, Zhi Hua; Zhao, Longmao

doi:10.1016/j.msea.2013.11.011

Cited by 18 publications

(8 citation statements)

References 24 publications

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“…In Equation (1), C and p are constants corresponding to strain rate effect and are C = 5 and p = 4 for A356 alloy [17,22,23]. The aluminum alloys are usually low-sensitive to strain rate [22].…”

Section: Micro-scale Modelmentioning

confidence: 99%

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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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Section: Micro-scale Modelmentioning

confidence: 99%

“…The aluminum alloys are usually low-sensitive to strain rate [22]. The Plastic-kinematic material model in ANSYS/LS-DYNA also includes a parameter F s which represents the failure strain and was used to eliminate the failed elements after being highly distorted.…”

Section: Micro-scale Modelmentioning

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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“…Their application for porous structures has begun in the last decade but it is still in development. Several methods have been investigated for the analysis and modelling of open-cell and closed-cell aluminium foams [29,30]. Finite element modelling (FEM) can indicate the relationship between deformation mechanisms and relative foam density [6].…”

Section: Introductionmentioning

confidence: 99%

Influence of Porosity on the Mechanical Behavior during Uniaxial Compressive Testing on Voronoi-Based Open-Cell Aluminium Foam

et al. 2019

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We have studied an application of the Voronoi tessellation method in the modeling of open-cell aluminium foam under uniaxial compressive loading. The Voronoi code was merged with computer-aided design (CAD) for converting the polyhedral model into an irregular open-cell cellular structure to create porous samples for compression testing simulations. Numerical simulations of the uniaxial compression uniformly over the upper surface of the sample in the z-axis direction at a constant 20 N load was realised. Samples with three different porosities (30%, 60% and 80%) were studied. A nonlinear elasto-plastic material model with perfect plasticity, without hardening, based on the von Mises yield criterion was applied below 10% strain. Corresponding stress–strain curves were observed and the influence of porosity on deformation mechanism was discussed. Samples with higher porosity exhibited significantly higher normal stress under the same load, and increased stress plateaus. An increase of porosity produced an increase of both compressive and tensile stresses and struts exhibited complex stress fields. Voronoi-based modeling was in accordance with experimental results in the literature in the case of the quasi-static condition and linear elastic region (below 1% strain). Further study is necessary to enable the simulation of real dynamic behaviour under all deformation regimes by using the Voronoi tessellation method.

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“…Beech wood and wood composites have been widely used in construction and buildings in many European countries in recent decades, due to the fact that they are renewable, efficient, and available in a variety of shapes [3,4]. Additionally, wood, similarly to other materials, such as honeycomb material [5], foam material [6][7][8], and sandwich composite material [9], has also been applied in sandwich structures as an energy-absorbing material or protective material [10,11], and has the advantages of being cheaper and displaying a better energy-absorbing ability, while still having a higher strength after severe deformation.…”

Section: Introductionmentioning

confidence: 99%

“…The split Hopkinson pressure bar (SHPB) [21], as a common experimental device for testing the dynamic mechanical properties of materials, can solve the coupled problem between the stress wave effect and strain rate effect of materials under high strain rates. The SHPB device can produce different strain rates of test specimens by controlling the impact velocities of the striker bar, and has been applied in testing for dynamic mechanical properties of different kinds of materials under different high strain rates, such as foam materials [5][6][7][8], concrete materials [22,23], metal materials [24,25], and composite materials [26,27].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Strain Rate and Fiber Direction on the Dynamic Mechanical Properties of Beech Wood

Pang

Liang

Tao

et al. 2019

Forests

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As a macroscopically orthotropic material, beech wood has different mechanical properties along the fiber direction and the direction perpendicular to the fiber direction, presenting a complicated strain rate sensitivity under impact or blast loadings. To understand the effect of the strain rate on the mechanical properties of beech wood, dynamic compression tests were conducted for the strain rate range of 800 s−1–2000 s−1, and quasi-static compression tests for obtaining the static mechanical properties of beech wood were also performed for comparison. The fiber direction effect on the mechanical properties was also analyzed, considering two loading directions: one perpendicular to the beech fiber direction and the other parallel to the beech fiber direction. The results show that beech wood for both loading directions has a significant strain rate sensitivity, and the mechanical properties of beech wood along the fiber direction are superior to those along the direction perpendicular to the fiber direction. An analysis of the macrostructures and microstructures of beech specimens is also presented to illustrate the failure mechanisms. The beech wood, as a natural protective material, has special dynamic mechanical properties in the aspect of transverse isotropy. This research provides a theoretical basis for application in protective structures.

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Effect of loading rate on the compressive properties of open-cell metal foams

Cited by 18 publications

References 24 publications

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

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

Influence of Porosity on the Mechanical Behavior during Uniaxial Compressive Testing on Voronoi-Based Open-Cell Aluminium Foam

Effect of the Strain Rate and Fiber Direction on the Dynamic Mechanical Properties of Beech Wood

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