Mechanical properties of functionally graded 2-D cellular structures: A finite element simulation

Ajdari, Amin; Canavan, Paul K.; Nayeb-Hashemi, Hamid; Warner, Grant

doi:10.1016/j.msea.2008.08.040

Cited by 102 publications

(54 citation statements)

References 19 publications

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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).…”

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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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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show abstract

“…By changing the thickness of the foam wall and the pore diameter, the foam density gradient can be achieved. Gupta et al [20][21] improved the energy absorption of the foam. Yin et al [22][23] also used the functionally gradient foam and the gradient-changing thin-walled tube to design the crashworthiness of the combination of the two.…”

Section: Optimization Of the Original Structurementioning

confidence: 99%

Study on Impact Performance of Energy Absorbing Structures under Horizontal Offset Loading

Yao¹,

Xiao²,

Xu³

et al. 2017

dtetr

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Abstract. When a train collision occurs, it is impossible for the vehicle to produce a completely axial collision. To improve the energy absorption performance of the energy-absorbing structure under an eccentric collision, in this paper, the collision performance of a subway vehicle energy absorption structure under a horizontal offset of 0-40 mm is studied via simulation. The results show that the original structure is prone to instability when the horizontal offset is large, so it is necessary to perform an optimization. Based on the concept of gradient material, the honeycomb strength in the structure is changed into a gradient distribution, and the results show that the improved structure did not show any instability phenomenon under all horizontal offsets. Under the horizontal offset of 40 mm, compared with the original structure, the energy absorption increased by 171.88% and the peak force decreased by 1.92% at the same time.

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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%

“…In the quasi-static conditions, Hou et al [17] studied the compressive modulus and compressive strength of the graded conventional-auxetic Kirigami sandwich structures, Ajdari et al. [18] investigated the compressive uniaxial and biaxial behavior of functionally graded Voronoi structures, as well as the effect of missing cell walls. Under the dynamic loading conditions, Kiernan et al [19] has found the superiority of graded cellular materials on impact resistance.…”

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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Mechanical properties of functionally graded 2-D cellular structures: A finite element simulation

Cited by 102 publications

References 19 publications

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

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

Study on Impact Performance of Energy Absorbing Structures under Horizontal Offset Loading

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

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