Dynamic crushing of aluminum foams: Part I – Experiments

Barnes, Arthur K.; Ravi‐Chandar, K.; Kyriakides, Stelios; Gaitanaros, Stavros

doi:10.1016/j.ijsolstr.2013.11.019

Cited by 120 publications

(99 citation statements)

References 17 publications

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“…The classical R-PP-L model has been proven to overestimate the stress behind the front and the shock wave speed because the densification strain is assumed to be a constant locking strain, which is usually too small when the impact velocity is high. In fact, the densification strain increases with the increase of impact velocity for cellular materials under dynamic crushing (Zou et al, 2009;Barnes et al, 2014;Zheng et al, 2014). Thus the results predicted by the R-PH shock model are closer to the FE results.…”

Section: Latin American Journal Of Solids and Structures 14 (2017) 12supporting

confidence: 55%

Stress Distribution in Graded Cellular Materials Under Dynamic Compression

Wang

Zheng

et al. 2017

Lat. Am. j. solids struct.

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Dynamic compression behaviors of density-homogeneous and density-graded irregular honeycombs are investigated using cell-based finite element models under a constant-velocity impact scenario. A method based on the cross-sectional engineering stress is developed to obtain the one-dimensional stress distribution along the loading direction in a cellular specimen. The cross-sectional engineering stress is contributed by two parts: the node-transitive stress and the contact-induced stress, which are caused by the nodal force and the contact of cell walls, respectively. It is found that the contactinduced stress is dominant for the significantly enhanced stress behind the shock front. The stress enhancement and the compaction wave propagation can be observed through the stress distributions in honeycombs under high-velocity compression. The single and double compaction wave modes are observed directly from the stress distributions. Theoretical analysis of the compaction wave propagation in the density-graded honeycombs based on the R-PH (rigid-plastic hardening) idealization is carried out and verified by the numerical simulations. It is found that stress distribution in cellular materials and the compaction wave propagation characteristics under dynamic compression can be approximately predicted by the R-PH shock model. dynamic crushing. However, most research work is restricted to the stress at the impact/support end and thus the stress distribution is not well considered. KeywordsSignificant enhancement of crushing stress was observed in the dynamic impact experiments of woods (Reid and Peng, 1997;Harrigan et al., 2005), aluminum honeycombs (Zhao and Gary, 1998;Hou et al., 2012) and foams (Mukai et al., 1999;Deshpand and Fleck, 2000;Tan et al., 2005a;Elnasri et al., 2007). Several shock models and mass-spring models have been proposed to understand the shock wave propagation in cellular materials under dynamic impact, such as the R-PP-L (rate-independent, rigid-perfectly plastic-locking) model (Reid and Peng, 1997), the mass-spring model (Li and Meng, 2002), the E-PP-R (elastic-perfectly plastic-rigid) model (Lopatnikov et al., 2003), the power law densification model and the D-R-PH (dynamic, rigidplastic hardening) shock model . Because the assurance of the repeatability of samples and the measurement of local stress and strain states have not been well solved by experimental techniques, finite element (FE) method has been applied to simulate the dynamic crushing of cellular materials, such as regular/irregular honeycombs (Ruan et al., 2003;Zheng et al., 2005;Liu et al., 2009;Zou et al., 2009;Hu and Yu, 2013) and open-/closed-cell foams Zheng et al., 2014;Sun et al., 2016). The typical features of stress enhancement and deformation localization can be appropriately represented.The introduction of gradient to cellular structures may influence the macroscopic mechanical properties, and thus graded cellular materials have become popular in energy absorption and impact resistance. The compressive mechanical ...

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Section: Latin American Journal Of Solids and Structures 14 (2017) 12supporting

confidence: 55%

Stress Distribution in Graded Cellular Materials Under Dynamic Compression

Wang

Zheng

et al. 2017

Lat. Am. j. solids struct.

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“…Recent work by the authors and others have extended such models along the lines described in [4] to accurately describe elastic wave propagation by incorporating microinertial effects. Like foams and similar underdense materials [5,6], these lattice structures have the potential to be excellent impact and shock mitigation materials, as they have the ability to absorb large amounts of energy per unit weight. This work extends, in an approximate manner, an equivalent continuum model representing the behavior of stretch-dominated lattices for quasi-static and small-deformation dynamic behavior to account for shock compression.…”

Section: Introductionmentioning

confidence: 99%

Modeling shocks in periodic lattice materials

Messner¹,

Barham²,

Kumar³

et al. 2017

AIP Conference Proceedings

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“…Metallic foams are widely used in protective structures against impact [1][2][3], blast loadings [4][5][6] and dynamic crushing [7] due to their low density and high energy absorption capability. Competitors such as corrugated structures [8][9][10][11] were also proposed having controllable macro structures in complex shapes by providing energy absorption comparable with foam-like behavior.…”

Section: Introductionmentioning

confidence: 99%

Dynamic crushing and energy absorption of sandwich structures with combined geometry shell cores

Taşdemirci

Kara

Turan

et al. 2015

Thin-Walled Structures

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a b s t r a c tDynamic crushing and energy absorption characteristics of sandwich structures with combined geometry shell cores were investigated experimentally and numerically. The effect of strain rate on the crushing behavior was presented by the crushing tests at quasi-static, intermediate and high strain rate regimes. It was shown that absorbed energy increased with increasing impact velocity. The effect of confinement on crushing behavior was shown by conducting confined experiments at quasi-static and dynamic rates. Higher buckling loads at lower deformation were observed in confined quasi-static crushing due to additional lateral support and friction provided by confinement wall. By using fictitious numerical models with strain rate insensitive material models, the effect of inertia and strain rate on crushing were shown. It was observed that, increase in impact velocity caused increase in inertial effects and strain rate effects were nearly independent from the impact velocity. The effects of multilayering were also investigated numerically.

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Dynamic crushing of aluminum foams: Part I – Experiments

Cited by 120 publications

References 17 publications

Stress Distribution in Graded Cellular Materials Under Dynamic Compression

Stress Distribution in Graded Cellular Materials Under Dynamic Compression

Modeling shocks in periodic lattice materials

Dynamic crushing and energy absorption of sandwich structures with combined geometry shell cores

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