ENERGY ABSORPTION EFFICIENCY IN CELLULAR SOLIDS

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1730-1735 ◽  
Author(s):  
KUNIHARU USHIJIMA ◽  
DAI-HENG CHEN ◽  
HIRONOBU NISITANI
Keyword(s):  
Energy Absorption ◽  
Honeycomb Structure ◽  
Absorption Efficiency ◽  
Absorption Capacity ◽  
Cellular Solids ◽  
Absorbed Energy ◽  
Energy Absorption Capacity ◽  
Geometrical Properties ◽  
Energy Absorption Efficiency ◽  
New Type

In this paper, a new type of honeycomb structure is proposed to enhance the energy absorption capacity for a honeycomb structure, and investigated its energy absorption efficiency (absorbed energy per unit volume) by finite element method (FEM). This model has small arc-shaped parts on the double cell wall, and can be manufactured by a similar way of standard honeycomb structures. Also, the proposed structure has large rigidity of plastic bending without increasing the mass. In this paper, effects of geometrical properties on the energy absorption characteristics are discussed.

Compressive Properties of Electroless Ni-P Coating Reinforced Magnesium Alloy Foams

2021 ◽  
Vol 889 ◽  
pp. 123-128
Author(s):  
Sheng Jun Liu ◽  
Zhi Qiang Dong ◽  
Ren Zhong Cao ◽  
Da Song ◽  
Jia An Liu ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Energy Absorption ◽  
Absorption Efficiency ◽  
Absorption Capacity ◽  
Compressive Properties ◽  
Compressive Test ◽  
Energy Absorption Capacity ◽  
Energy Absorption Efficiency ◽  
Hybrid Foams ◽  
Electroless Ni

In this study, the open-cell Mg-2Zn-0.4Y foams were prepared by infiltration casting method. The Ni/Mg hybrid foams were prepared by electroless Ni-P coating on the foam struts to improve the compressive strength and energy absorption capacity. The compressive properties of the Mg alloy foams and Ni/Mg hybrid foams were studied by quasi-static compressive test. The experimental results show that the Ni-P coating is composed of crystallites. The Ni-P coating can significantly enhance the compressive strength, energy absorption capacity and energy absorption efficiency of the foams.

Study of Impact Properties of a Fluid-Filled Honeycomb Structure

2013 ◽  
Author(s):  
J. Clark ◽  
S. Jenson ◽  
J. Schultz ◽  
J. Hoffman ◽  
S. Takak ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Newtonian Fluid ◽  
Cellular Structure ◽  
Critical Role ◽  
Honeycomb Structure ◽  
Absorption Capacity ◽  
Functionally Graded ◽  
Banana Peel ◽  
Energy Absorption Capacity ◽  
Impact Properties

The work presented in this paper is a continuation of the study conducted on exploring impact properties of a functionally graded bio cellular structure found in a banana peel. The graded cellular structure with unfilled cells reacts intelligently to impact loading and crushes in a manner that results in a higher amount of energy absorption as compared to an equivalent regular honeycomb structure. In this paper, a non-Newtonian fluid is introduced into the cells of a regular honeycomb structure, and its effect on energy absorption properties are studied using an experimental approach. The results are compared with impact mitigation properties of an unfilled regular honeycomb structure. The introduction of non-Newtonian fluid significantly enhances the energy absorption capacity of regular honeycomb structure, and therefore, suggests that fluid inside a banana peel structure is playing a critical role in energy and impact absorption. A rudimentary relationship between the numbers of fluid filled layers and total energy absorption capacity of the structure is presented through a regression analysis.

scholarly journals Fabrication of Ti-Alloy Powder/Solid Composite with Uniaxial Anisotropy by Introducing Unidirectional Honeycomb Structure via Electron Beam Powder Bed Fusion

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1074
Author(s):  
Naoko Ikeo ◽  
Tatsuya Matsumi ◽  
Takuya Ishimoto ◽  
Ryosuke Ozasa ◽  
Aira Matsugaki ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electron Beam ◽  
Energy Absorption ◽  
Uniaxial Anisotropy ◽  
Honeycomb Structure ◽  
Absorption Capacity ◽  
Powder Bed Fusion ◽  
Energy Absorption Capacity ◽  
Powder Bed ◽  
Powder Particles

In this study, a Ti–6Al–4V alloy composite with uniaxial anisotropy and a hierarchical structure is fabricated using electron beam powder bed fusion, one of the additive manufacturing techniques that enable arbitrary fabrication, and subsequent heat treatment. The uniaxial anisotropic deformation behavior and mechanical properties such as Young’s modulus are obtained by introducing a unidirectional honeycomb structure. The main feature of this structure is that the unmelted powder retained in the pores of the honeycomb structure. After appropriate heat treatment at 1020 °C, necks are formed between the powder particles and between the powder particles and the honeycomb wall, enabling a stress transmission through the necks when the composite is loaded. This means that the powder part has been mechanically functionalized by the neck formation. As a result, a plateau region appears in the stress–strain curve. The stress transfer among the powder particles leads to the cooperative deformation of the composites, contributing to the excellent energy absorption capacity. Therefore, it is expected that the composite can be applied to bone plates on uniaxially oriented microstructures such as long bones owing to its excellent energy absorption capacity and low elasticity to unidirectionally suppress stress shielding.

Comparing Study of Energy-Absorbing Behavior for Honeycomb Structures

2011 ◽  
Vol 462-463 ◽  
pp. 13-17 ◽  
Author(s):  
Yan Wang ◽  
P. Xue ◽  
J.P. Wang
Keyword(s):  
Cell Wall ◽  
Energy Absorption ◽  
Honeycomb Structure ◽  
Absorption Capacity ◽  
Cell Geometry ◽  
Energy Absorption Capacity ◽  
Plateau Stress ◽  
Honeycomb Structures ◽  
Multifunctional Material ◽  
Energy Absorbing

Honeycomb materials，as a type of ultra-light multifunctional material，have been examined extensively in recent years and have been applied in many fields. This study investigated the energy absorption capacity and their mechanisms of honeycomb structures with five different cell geometry (square，triangular，circular, hexagonal，kagome). It has been shown that the honeycomb structure with kagome cells is the best choice under the targets of the energy absorption capacity, peak force and plateau stress, when relative density and cell wall thickness of the five kinds of honeycombs are the same. Besides, honeycomb with hexagonal cells and honeycomb with triangular cells are also ideal structures for energy absorption purpose.

ENERGY ABSORPTION OF EXPANSION TUBE CONSIDERING LOCAL BUCKLING CHARACTERISTICS

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5993-5999 ◽  
Author(s):  
KWANG-HYUN AHN ◽  
JIN-SUNG KIM ◽  
HOON HUH
Keyword(s):  
Energy Absorption ◽  
Local Buckling ◽  
Expansion Ratio ◽  
Absorption Capacity ◽  
Buckling Load ◽  
Expansion Tube ◽  
Absorbed Energy ◽  
Energy Absorption Capacity ◽  
Element Analysis ◽  
Numerical Result

This paper deals with the crash energy absorption and the local buckling characteristics of the expansion tube during the tube expanding processes. In order to improve energy absorption capacity of expansion tubes, local buckling characteristics of an expansion tube must be considered. The local buckling load and the absorbed energy during the expanding process were calculated for various types of tubes and punch shapes with finite element analysis. The energy absorption capacity of the expansion tube is influenced by the tube and the punch shape. The material properties of tubes are also important parameter for energy absorption. During the expanding process, local buckling occurs in some cases, which causes significant decreasing the absorbed energy of the expansion tube. Therefore, it is important to predict the local buckling load accurately to improve the energy absorption capacity of the expansion tube. Local buckling takes place relatively easily at the large punch angle and expansion ratio. Local buckling load is also influenced by both the tube radius and the thickness. In prediction of the local buckling load, modified Plantema equation was used for strain hardening and strain rate hardening. The modified Plantema equation shows a good agreement with the numerical result.

Graded Origami Honeycomb Tube for Energy Absorption

2019 ◽  
Author(s):  
Leo de Waal ◽  
Zhong You
Keyword(s):  
Energy Absorption ◽  
Honeycomb Structure ◽  
Absorption Capacity ◽  
Geometric Parameters ◽  
Peak Force ◽  
Initial Stiffness ◽  
Energy Absorption Capacity ◽  
Loading Process ◽  
Force Increase ◽  
Force Reduction

Abstract When loaded parallel to the prismatic cells (out-of-plane), honeycombs and re-entrant honeycombs exhibit high initial stiffness and peak force, followed by a force reduction as progressive failure occurs. The high initial peak force and large post-peak force reduction are undesirable for energy absorption purposes. In this study a graded honeycomb structure based on origami is proposed in an effort to lower the peak force, increase the energy absorption capacity and tune the stiffness throughout the loading process. The grading is achieved through a developable origami crease pattern that utilises the typical honeycomb expansion manufacturing technique. The crease pattern has one degree of freedom and is constructed from a repetition of a modified Miura-ori unit. A kinematic study of the crease pattern is completed, highlighting the simple geometric parameters that can be altered to tune the structure. Quasi-static numerical simulations are then used to investigate the interaction between these simple geometric parameters, the energy absorption capacity and the stiffness throughout the loading process. Compared to honeycomb and re-entrant honeycomb tubes, it has been found that a reduction in the peak force, increase in energy absorption capacity and tunable stiffness can be achieved.

scholarly journals FEA and Quasi-static Test on Energy Absorption Characteristic of Space Orthogonal Concave Honeycomb Structure with Negative Poisson’s Ratio

2022 ◽  
Vol 2160 (1) ◽  
pp. 012064
Author(s):  
Nan Sun ◽  
Shuai Wang ◽  
Kaifa Zhou ◽  
Wenyi Ma ◽  
Bohao Xu
Keyword(s):  
Energy Absorption ◽  
Poisson’S Ratio ◽  
Honeycomb Structure ◽  
Absorption Capacity ◽  
Poisson's Ratio ◽  
Absorption Characteristic ◽  
Negative Poisson’S Ratio ◽  
Energy Absorption Capacity ◽  
Static Compression ◽  
Negative Poisson's Ratio

Abstract As a representative of metamaterials, negative Poisson’s ratio (NPR) material possesses special mechanical properties such as expansion, negative compression ratio and so forth. As a result, it is widely used in the fields of vehicles, aerospace, et al. In this paper, a novel space orthogonal concave honeycomb structure (OC) is designed based on traditional concave honeycomb structure (CHS). In order to explore the influence rule of OC structure on the deformation and energy absorption capacity of crash box under low-speed collision, mechanical analysis and parameter research on OC structure are conducted through quasi-static compression test and numerical simulation. The results suggest that the finite element results of OC structure fit well with the experimental results, and the FEM is highly credible. In addition, the novel OC sandwich structure can effectively enhance the deformation capacity and improve the energy absorption performance of the crash box. When the wall thickness ? of OC structure is 1mm and angle ? is 50°, the deformation and energy absorption capacity of the crash box increased by 25.6% and 19.3% respectively.

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