Theoretical and finite element study of a compact energy absorber

Ali, Muhammad; Qamhiyah, Abir Z.; Flugrad, Donald R.; Shakoor, Mwafak

doi:10.1016/j.advengsoft.2006.12.006

Cited by 79 publications

(39 citation statements)

References 18 publications

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“…Previous studies have shown that the cell-wall angle is also an important geometric parameter in describing the mechanical characteristics of conventional honeycombs [24,25,35]. By simply changing Based on the FE simulated results, Figure 12 illustrates the variation of the plateau stresses at the proximal and distal ends of auxetic honeycombs for the same edge thickness = 0.2 mm with respect to impact velocity.…”

Section: Effect Of Cell-wall Anglementioning

confidence: 99%

Numerical Investigation on Dynamic Crushing Behavior of Auxetic Honeycombs with Various Cell-Wall Angles

Zhang

Ding

et al. 2014

Advances in Mechanical Engineering

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Auxetic honeycombs have proven to be an attractive advantage in actual engineering applications owing to their unique mechanical characteristic and better energy absorption ability. The in-plane dynamic crushing behaviors of the honeycombs with various cellwall angles are studied by means of explicit dynamic finite element simulation. The influences of the cell-wall angle, the impact velocity, and the edge thickness on the macro/microdeformation behaviors, the plateau stresses, and the specific energy absorption of auxetic honeycombs are discussed in detail. Numerical results show, that except for the impact velocity and the edge thickness, the in-plane dynamic performances of auxetic honeycombs also rely on the cell-wall angle. The "> <"-mode local deformation bands form under low-or moderate-velocity impacting, which results in lateral compression shrinkage and shows negative Poisson's ratio during the crushing. For the given impact velocity, the plateau stress at the proximal end and the energy-absorbed ability can be improved by increasing the negative cell angle, the relative density, the impact velocity, and the matrix material strength. When the microcell parameters are the constant, the plateau stresses are proportional to the square of impact velocity.

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Section: Effect Of Cell-wall Anglementioning

confidence: 99%

Numerical Investigation on Dynamic Crushing Behavior of Auxetic Honeycombs with Various Cell-Wall Angles

Zhang

Ding

et al. 2014

Advances in Mechanical Engineering

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“…In the quasi-static conditions, Ajdari et al (2009) investigated the compressive uniaxial and biaxial behavior of functionally graded Voronoi structures, as well as the effect of missing cell walls on its overall mechanical (elastic, plastic, and creep) properties. Ali et al (2008) established a graded energy absorbing structure-a inspiration from the geometry in a banana peel, and gave the theoretical prediction of the behavior under low velocity based on the equations derived by Gibson and Ashby (1997). Kiernan et al (2009) had found the superiority of graded cellular materials on impact resistance and energy absorption for creating impact resistant structures and cushioning materials.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are limited studies on the dynamic behaviors of the graded cellular structures (Wadley et al, 2008;Ali et al, 2008;Gibson and Ashby, 1997). In the quasi-static conditions, Ajdari et al (2009) investigated the compressive uniaxial and biaxial behavior of functionally graded Voronoi structures, as well as the effect of missing cell walls on its overall mechanical (elastic, plastic, and creep) properties.…”

Section: Introductionmentioning

confidence: 99%

Dynamic crushing of uniform and density graded cellular structures based on the circle arc model

Zhang

Wei

Wang

et al. 2015

Lat. Am. j. solids struct.

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A new circle-arc model was established to present the cellular structure. Dynamic response of models with density gradients under constant velocities is investigated by employing Ls-dyna 971. Compared with the uniform models, the quasi-static plateau stress of different layers seems a significant parameter correlated with the deformation mode except for inertia effect when the density gradient is introduced. The impact velocity becomes much more vital on the deformation of the unit cell than the density gradient. The stress at both the impact and stationary sides is investigated in details. Furthermore, the stress-strain curve is compared with the modified shock wave theory. The density gradient does have some remarkable influence on the energy absorption capability, and a certain density gradient is not always beneficial to the energy absorption. Irrespective of the impact velocity, there seems always a critical strain where the energy absorbed by all these specimens could approximate to nearly the same value. So the critical strain-velocity curve is plotted and gives the beneficial area for energy absorption pertinent to density gradients and impact velocity.

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“…However, there are limited studies on the dynamic behaviors of the graded cellular materials [13][14][15][16][17][18][19][20]. Xiao et al [16] developed a new gradient sandwich model by introducing a gradient expression of material properties to predict the free vibration of composite sandwich panel with the gradient core.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response of functionally graded cellular materials based on the Voronoi model

Zhang

Wang

Zhao

2016

Composites Part B: Engineering

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Theoretical and finite element study of a compact energy absorber

Cited by 79 publications

References 18 publications

Numerical Investigation on Dynamic Crushing Behavior of Auxetic Honeycombs with Various Cell-Wall Angles

Numerical Investigation on Dynamic Crushing Behavior of Auxetic Honeycombs with Various Cell-Wall Angles

Dynamic crushing of uniform and density graded cellular structures based on the circle arc model

Dynamic response of functionally graded cellular materials based on the Voronoi model

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