Large Torsion Deformation: Centrosymmetric Reentrant Honeycomb

2022 ◽  
Vol 904 ◽  
pp. 17-25
Author(s):  
Bo Hao Xu ◽  
Shuai Wang ◽  
Kai Fa Zhou ◽  
Wen Yi Ma ◽  
Nan Sun
Keyword(s):  
Energy Absorption ◽  
Sandwich Structure ◽  
Absorption Capacity ◽  
The Other ◽  
Deformation Pattern ◽  
Deformation Capacity ◽  
Energy Absorption Capacity ◽  
Specific Energy Absorption ◽  
Absorption Performance ◽  
Torsion Deformation

There exist some problems in the crash box and anti-collision beam sandwich structure, such as monotone deformation pattern and uneconomical energy absorption performance. In order to raise the deformation capacity and energy absorption performance of sandwich structure, centrosymmetric reentrant honeycomb (CRH) and hexagonal centrosymmetric reentrant honeycomb (HCRH) are proposed based on auxetic reentrant honeycomb (ARH) in this work. Based on HCRH, four kinds of transverse combination structures and two kinds of longitudinal combination structures are obtained. The results of specific energy absorption show that the energy absorption capacity of the angular contact homodromous combination structure (ACOC) is about 3 times that of the other three transverse combination structures. Compared with longitudinal heterodromous combination structure (LHEC), the energy absorption capacity of longitudinal homodromous combination structure (LHOC) is improved by 72.7%.

Energy-Absorbing Characteristics of the Stiffened Thin-Walled Tubes Subjected to Axial Crushing

2013 ◽  
Vol 437 ◽  
pp. 158-163
Author(s):  
Wei Liang Dai ◽  
Xu Guang Li ◽  
Qing Chun Wang
Keyword(s):  
Energy Absorption ◽  
Specific Energy ◽  
Absorption Capacity ◽  
Test Results ◽  
Energy Absorption Capacity ◽  
Specific Energy Absorption ◽  
Axial Crushing ◽  
The Mean ◽  
Thin Walled ◽  
Energy Absorbing

Energy absorbing characteristics of the non-stiffened and stiffened single hat sections subjected to quasi-static axial crushing were experimentally investigated. First non-stiffened hat sections were axially crushed, then structures with different stiffened methods (stiffened in hat and stiffened in the plate) were tested, finally energy absorption capacities of these structures were compared. Test results showed that, for the appropriate designed stiffened tube, the mean crush force and mass specific energy absorption were increased significantly compared to the non-stiffened. Stiffened in hat section showed a little more energy absorption capacity than that stiffened in the plate, but the structure may sustain a global bending.

scholarly journals Effect of different fiber type on sprayed concrete support capacity

2020 ◽  
Vol 3 (1) ◽  
pp. 1-6
Author(s):  
J. M. Alavarado ◽  
A. Duarte
Keyword(s):  
Energy Absorption ◽  
Steel Fiber ◽  
Fiber Type ◽  
Absorption Capacity ◽  
Steel Fibers ◽  
The Other ◽  
Energy Absorption Capacity ◽  
Load Bearing Capacity ◽  
Sprayed Concrete ◽  
Synthetic Fibers

Nowadays there are several types of fiber for the reinforcement of the sprayed concrete used in tunnel support; most popular among them are steel fibers and macro synthetic fibers. However, in most cases the assessment of fiber reinforced sprayed concrete ductility is focused on the fulfillment of energy absorption capacity requirements without considering the effect of the reinforcement type on the Load-Displacement behavior. The following study aims to find out if the support capacity provided by each fiber type is the same for similar levels of energy absorption capacity or how it can be affected through the analysis of the load bearing capacity. After the analysis of energy absorption tests according to EFNARC of more than 50 specimens separately reinforced with steel and macro synthetic fibers, it was observed the specimens reinforced with steel fiber absorbed more energy since the beginning of deformation than those reinforced with macro synthetic fibers. In other words, the required work to start deforming the steel fiber reinforced sprayed concrete is greater than the required with the other fiber type. Likewise, the ultimate strength or maximum load bearing capacity provided by steel fibers was higher than the other fiber type. Therefore, the support capacity of the sprayed concrete and the related safety factor provided by each fiber type is different

scholarly journals Experimental Study on Impact Absorption Capacity of Various Expanded Materials for Rock Shed

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Yusuke Kurihashi ◽  
Naochika Kogure ◽  
Shin-ichi Nitta ◽  
Masato Komuro
Keyword(s):  
Energy Absorption ◽  
Impact Resistance ◽  
Material Testing ◽  
Absorption Capacity ◽  
Rock Falls ◽  
Energy Absorption Capacity ◽  
Continuous Increase ◽  
Practical Applications ◽  
Mountainous Regions ◽  
Absorption Performance

In recent years, there has been a continuous increase in the intensity of natural disasters. Slope disasters such as rock falls occur along coastlines and in mountainous regions. Rock shed structures are implemented as measures to prevent rock fall damage; however, these structures deteriorate over time, and their impact resistance also decreases. As a supplementary measure, a method employing foam material as a cushioning material has been used in practical applications. However, the effect of the compressive strength characteristics on the cushioning performance of foamed materials has not been studied thus far. Therefore, in this study, falling-weight impact-loading tests involving various fall heights were performed to examine the absorption performance of various expanded materials. Moreover, we examined the case where core slabs were layered to effectively exploit the absorption performance of the expanded materials. The results of this study are summarized as follows: (1) the transmitted impact penetration stress-strain curves right under the loading points of various expanded materials exhibit properties similar to those obtained from the results of material testing. However, in the case of expanded materials with high compressive strengths, the compressive stress from the results of material testing tends to be lower. (2) In the case of expanded materials with high compressive strengths, with and without core slabs, the distribution of the transmitted impact stress is large, and the energy absorption capacity is high. (3) In this experiment, the energy absorption capacity was found to double when core slabs are layered, regardless of the type of expanded material used. This suggests that expanded materials with high compressive strengths may contribute towards a higher improvement in energy absorption capacities, by using layered core slabs.

scholarly journals Crashworthiness Design for Bionic Bumper Structures Inspired by Cattail and Bamboo

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Tao Xu ◽  
Nian Liu ◽  
Zhenglei Yu ◽  
Tianshuang Xu ◽  
Meng Zou
Keyword(s):  
Energy Absorption ◽  
Structural Characteristics ◽  
Absorption Capacity ◽  
Nonlinear Finite Element ◽  
Lateral Impact ◽  
Bionic Design ◽  
Energy Absorption Capacity ◽  
Specific Energy Absorption ◽  
Full Size ◽  
Crashworthiness Design

Many materials in nature exhibit excellent mechanical properties. In this study, we evaluated the bionic bumper structure models by using nonlinear finite element (FE) simulations for their crashworthiness under full-size impact loading. The structure contained the structural characteristics of cattail and bamboo. The results indicated that the bionic design enhances the specific energy absorption (SEA) of the bumper. The numerical results showed that the bionic cross-beam and bionic box of the bionic bumper have a significant effect on the crashworthiness of the structure. The crush deformation of bionic cross-beam and box bumper model was reduced by 33.33%, and the total weight was reduced by 44.44%. As the energy absorption capacity under lateral impact, the bionic design can be used in the future bumper body.

Testing on Energy Absorption of Banana Fiber Polyester Composite

2011 ◽  
Vol 117-119 ◽  
pp. 873-875
Author(s):  
Noor Hisyam Bin Noor Mohamed ◽  
Hasmiryadie Juneh ◽  
Mahshuri Yusof
Keyword(s):  
Energy Absorption ◽  
Specific Energy ◽  
Fiber Length ◽  
Absorption Capacity ◽  
Synthetic Fiber ◽  
Energy Absorption Capacity ◽  
Banana Fiber ◽  
Specific Energy Absorption ◽  
Banana Fibers ◽  
Polyester Composite

Natural fibers are now becoming a subject of interest to replace synthetic fiber as reinforcement materials where the development of natural fiber composites has been conducted in the last few decades. The objective of this research is to investigate the energy absorption capacity of banana fiber polyester composite and its specific energy absorption capacity as well. Banana fibers are extracted and cut into 10mm, 20mm and 30mm fiber length. Fabrication of rectangular bar as composite samples with different banana fiber length and fiber volume fraction (1%, 2%, and 3%) were conducted and the results are studied and analyzed. The information on energy absorption and specific energy absorption capacity are useful for applications such as automotive structures where the ability to absorb impact may save life. The increase of banana fiber content and length shows an increase of maximum load and energy absorption values for all specimens.

Investigation on the Deformation Pattern and Energy Absorption Capacity of Hot-Stamping Structures with Partial Pressing Hardening

2012 ◽  
Vol 488-489 ◽  
pp. 87-92
Author(s):  
Wei Min Zhuang ◽  
Wan Dong Yu ◽  
Yan Hong Chen
Keyword(s):  
Energy Absorption ◽  
Fe Simulation ◽  
Hot Stamping ◽  
Distribution Patterns ◽  
Absorption Capacity ◽  
Deformation Pattern ◽  
Martensitic Steels ◽  
Energy Absorption Capacity ◽  
Three Point Bending ◽  
Set Up

Compared to traditional hot-stamping process, partial pressing hardening (PPH) can alter mechanical properties of metal components in any desired regions by controlling its bainite and martensite distribution. The mechanical property of the structure that is produced by PPH process is quite different from traditional hot-stamping steels (Martensitic steels) and has never been evaluated. Based on the merit of PPH process, this paper investigated the effect of bainite-martensite distribution on the deformation pattern and energy absorption capacity of PPH structures. The FE material models of martensitic and bainitic steel were set up and verified. After that, the deformation pattern and energy absorption capacity of PPH structures with different distribution patterns was investigated and discussed by three-point bending and tensile bending FE simulation.

Crashworthiness optimization of hierarchical hexagonal honeycombs under out-of-plane impact

2020 ◽  
pp. 095440622093910
Author(s):  
M Altin ◽  
E Acar ◽  
MA Güler
Keyword(s):  
Finite Element ◽  
Energy Absorption ◽  
Specific Energy ◽  
Numerical Study ◽  
Absorption Capacity ◽  
Optimization Approach ◽  
Energy Absorption Capacity ◽  
Specific Energy Absorption ◽  
Honeycomb Structures ◽  
Out Of Plane

This paper presents a numerical study of regular and hierarchical honeycomb structures subjected to out-of-plane impact loading. The specific energy absorption capacity of honeycomb structures via nonlinear explicit finite element analysis is investigated. The constructed finite element models are validated using experimental data available in the literature. The honeycomb structures are optimized by using a surrogate-based optimization approach to achieve maximum specific energy absorption capacity. Three surrogate models polynomial response surface approximations, radial basis functions, and Kriging models are used; Kriging models are found to be the most accurate. The optimum specific energy absorption value obtained for hierarchical honeycomb structures is found to be 148% greater than that of regular honeycomb structures.

scholarly journals Compressive Crush Performance of Square Tubes Filled with Spheres of Closed-Cell Aluminum Foams

2017 ◽  
Vol 62 (3) ◽  
pp. 1755-1760 ◽  
Author(s):  
A. Uzun
Keyword(s):  
Energy Absorption ◽  
Spherical Shape ◽  
Absorption Capacity ◽  
Aluminium Foam ◽  
The Other ◽  
Aluminum Foams ◽  
Energy Absorption Capacity ◽  
Closed Cell ◽  
Different Diameters ◽  
Powder Metallurgy Methods

AbstractThis paper describes the compressive crush behaviour of spheres of closed-cell aluminium foams with different diameters (6, 8 and 10 mm) and square tubes filled with these spheres. The spheres of closed-cell aluminium foams are net spherical shape fabricated via powder metallurgy methods by heating foamable precursor materials in a mould. The square tubes were filled by pouring the spheres of closed-cell aluminium foams freely (without any bonding). The compressive crush performance of square tubes filled with spheres of closed-cell aluminum foams were compared to that of the empty tubes. The results show a significant influence of the spheres of closed-cell aluminium foam on the average crushing load of the square tubes. The energy absorption in the square tube filled with spheres of closed-cell aluminium foam with diameters of 10 mm is higher than in the other square tubes. The spheres of closed-cell aluminium foams led to improvement of the energy absorption capacity of empty tubes.

Shock-Cushioning and Energy Absorption Performance Research of Aluminum Foam-Polyurethane Composite

2011 ◽  
Vol 287-290 ◽  
pp. 401-404
Author(s):  
Ming Si Qi ◽  
Wen Dong Zhang ◽  
Wei Yang ◽  
Hong Mei Wang ◽  
Bo Li
Keyword(s):  
Energy Absorption ◽  
Aluminum Foam ◽  
Absorption Capacity ◽  
Energy Absorption Capacity ◽  
Polyurethane Composite ◽  
Foam Polyurethane ◽  
Curve Method ◽  
Absorption Performance ◽  
Performance Research ◽  
Better Than

The paper researched stress and strain of aluminum foam, polyurethane and aluminum foam-polyurethane composite via Ansys software, researched energy absorption capacity of the three material via energy absorption curve method, and researched energy absorption capacity of the aluminum foam-polyurethane composite under different shock and different thickness. The research results are obvious: under the same material parameter and 7800gn shock conditions the energy absorption of the aluminum foam-polyurethane composite is better than the monomer of the aluminum foam and the polyurethane. Under the same shock conditions, the thicker the composite is, the more energy it absorbs. Aluminum foam-polyurethane composite can plays cushioning and energy absorption roles when the acceleration speed reaches 7800gn

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