Cushioning and Energy Absorbing Property of Combined Aluminum Honeycomb

2015 ◽  
Vol 17 (10) ◽  
pp. 1434-1441 ◽  
Author(s):  
Yu-Liang Lin ◽  
Zhi-Feng Zhang ◽  
Rong Chen ◽  
Yan Li ◽  
Xue-Jun Wen ◽  
...  
Keyword(s):  
Aluminum Honeycomb ◽  
Absorbing Property ◽  
Energy Absorbing

scholarly journals Inserting Stress Analysis of Combined Hexagonal Aluminum Honeycombs

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Xiangcheng Li ◽  
Kang Li ◽  
Yuliang Lin ◽  
Rong Chen ◽  
Fangyun Lu
Keyword(s):  
Structural Parameters ◽  
Base Material ◽  
Peak Stress ◽  
Displacement Curve ◽  
Out Of Plane ◽  
Aluminum Honeycomb ◽  
The One ◽  
Absorbing Property ◽  
Crushing Behavior ◽  
Energy Absorbing

Two kinds of hexagonal aluminum honeycombs are tested to study their out-of-plane crushing behavior. In the tests, honeycomb samples, including single hexagonal aluminum honeycomb (SHAH) samples and two stack-up combined hexagonal aluminum honeycombs (CHAH) samples, are compressed at a fixed quasistatic loading rate. The results show that the inserting process of CHAH can erase the initial peak stress that occurred in SHAH. Meanwhile, energy-absorbing property of combined honeycomb samples is more beneficial than the one of single honeycomb sample with the same thickness if the two types of honeycomb samples are completely crushed. Then, the applicability of the existing theoretical model for single hexagonal honeycomb is discussed, and an area equivalent method is proposed to calculate the crushing stress for nearly regular hexagonal honeycombs. Furthermore, a semiempirical formula is proposed to calculate the inserting plateau stress of two stack-up CHAH, in which structural parameters and mechanics properties of base material are concerned. The results show that the predicted stresses of three kinds of two stack-up combined honeycombs are in good agreement with the experimental data. Based on this study, stress-displacement curve of aluminum honeycombs can be designed in detail, which is very beneficial to optimize the energy-absorbing structures in engineering fields.

The energy-absorbing properties of composite tube-reinforced aluminum honeycomb

2017 ◽  
Vol 176 ◽  
pp. 630-639 ◽  
Author(s):  
A. Al Antali ◽  
R. Umer ◽  
J. Zhou ◽  
W.J. Cantwell
Keyword(s):  
Composite Tube ◽  
Aluminum Honeycomb ◽  
Energy Absorbing

scholarly journals Numerical Simulation on In-plane Deformation Characteristics of Lightweight Aluminum Honeycomb under Direct and Indirect Explosion

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2222 ◽  
Author(s):  
Xiangcheng Li ◽  
Yuliang Lin ◽  
Fangyun Lu
Keyword(s):  
Plane Deformation ◽  
Buffering Capacity ◽  
Response Mode ◽  
Deformation Characteristics ◽  
Rigid Plate ◽  
Dynamic Impact ◽  
Aluminum Honeycomb ◽  
Energy Absorbing ◽  
Deformation Modes ◽  
Better Than

Lightweight aluminum honeycomb is a buffering and energy-absorbed structure against dynamic impact and explosion. Direct and indirect explosions with different equivalent explosive masses are applied to investigate the in-plane deformation characteristics and energy-absorbing distribution of aluminum honeycombs. Two finite element models of honeycombs, i.e., rigid plate-honeycomb-rigid plate (RP-H-RP) and honeycomb-rigid plate (H-RP) are created. The models indicate that there are three deformation modes in the X1 direction for the RP-H-RP, which are the overall response mode at low equivalent explosive masses, transitional response mode at medium equivalent explosive masses, and local response mode at large equivalent explosive masses, respectively. Meanwhile, the honeycombs exhibit two deformation modes in the X2 direction, i.e., the expansion mode at low equivalent explosive masses and local inner concave mode at large equivalent explosive masses, respectively. Interestingly, a counter-intuitive phenomenon is observed on the loaded boundary of the H-RP. Besides, the energy distribution and buffering capacity of different parts on the honeycomb models are discussed. In a unit cell, most of the energy is absorbed by the edges with an edge thickness of 0.04 mm while little energy is absorbed by the other bilateral edges. For the buffering capacity, the honeycomb in the X1 direction behaves better than that in the X2 direction.

scholarly journals Use of Geogrids and Recycled Rubber in Railroad Infrastructure for Enhanced Performance

Geosciences ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 30 ◽  
Author(s):  
Buddhima Indraratna ◽  
Yujie Qi ◽  
Trung Ngoc Ngo ◽  
Cholachat Rujikiatkamjorn ◽  
Tim Neville ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Ground Improvement ◽  
Test Results ◽  
Track Maintenance ◽  
Work Input ◽  
The Stability ◽  
Absorbing Property ◽  
Energy Absorbing ◽  
The University ◽  
Track Deformation

Railway tracks are conventionally built on compacted ballast and structural fill layers placed above the natural (subgrade) foundation. However, during train operations, track deteriorations occur progressively due to ballast degradation. The associated track deformation is usually accompanied by a reduction in both load bearing capacity and drainage, apart from imposing frequent track maintenance. Suitable ground improvement techniques involving plastic inclusions (e.g., geogrids) and energy absorbing materials (e.g., rubber products) to enhance the stability and longevity of tracks have become increasingly popular. This paper presents the outcomes from innovative research and development measures into the use of plastic and rubber elements in rail tracks undertaken at the University of Wollongong, Australia, over the past twenty years. The results obtained from laboratory tests, mathematical modelling and numerical modelling reveal that track performance can be improved significantly by using geogrid and energy absorbing rubber products (e.g., rubber crumbs, waste tire-cell and rubber mats). Test results show that the addition of rubber materials can efficiently improve the energy absorption of the structural layer and also reduce ballast breakage. Furthermore, by incorporating the work input parameters, the energy absorbing property of the newly developed synthetic capping layer is captured by correct modelling of dilatancy. In addition, the laboratory behavior of tire cells and geogrids has been validated by numerical modelling (i.e., Finite Element Modelling-FEM, Discrete Element—DEM), and a coupled DEM-FEM modelling approach is also introduced to simulate ballast deformation.

scholarly journals The influence of rubber crumbs on the critical state behavior of waste mixtures

2019 ◽  
Vol 92 ◽  
pp. 06004
Author(s):  
Buddhima Indraratna ◽  
Yujie Qi ◽  
Ana Heitor ◽  
Jayan S. Vinod
Keyword(s):  
Critical State ◽  
Geotechnical Properties ◽  
Triaxial Tests ◽  
Test Results ◽  
State Behavior ◽  
Steel Furnace ◽  
Waste Tyres ◽  
State Behaviour ◽  
Absorbing Property ◽  
Energy Absorbing

The practical application of waste materials such as steel furnace slag (SFS) and coal wash (CW) is becoming more prevalent in many geotechnical projects. It was found that the inclusion of rubber crumbs (RCs) from recycled tyres into mixtures of SFS and CW not only solves the problem of large stockpiles of waste tyres, it also can provide an energy-absorbing medium that will reduce track degradation. In order to investigate the influence of RC on the geotechnical properties of the granular waste matrix (SFS+CW+RC), a series of monotonic consolidated drained triaxial tests were conducted on waste mixtures. The test results reveal that the inclusion of RC significantly affects the geotechnical properties of the waste mixtures, especially their critical state behaviour. Specifically, the waste matrix can achieve a critical state with a low RC content (<20%), whereas those mixtures with higher RC contents (20-40%) cannot attain a critical state within the ultimate strain capacity that can be applied to specimens using the traditional triaxial equipment. Therefore, for the waste matrix with higher RC contents extrapolation of the measured volumetric strains had to be adopted to obtain the appropriate critical state parameters. Moreover, the influence of energy absorbing property by adding RC on the critical state behaviour has also been captured through an empirical equation.

Composite energy-absorbing structures combining thin-walled metal and honeycomb structures

2016 ◽  
Vol 231 (4) ◽  
pp. 394-405 ◽  
Author(s):  
Hui Zhou ◽  
Ping Xu ◽  
Suchao Xie
Keyword(s):  
Metal Structure ◽  
Honeycomb Structure ◽  
Railway Vehicle ◽  
Hardening Material ◽  
Honeycomb Structures ◽  
Anisotropic Mechanical Properties ◽  
Aluminum Honeycomb ◽  
Thin Walled ◽  
Energy Absorbing ◽  
Composite Energy

The energy-absorbing structure of a crashworthy railway vehicle was designed by combining the characteristics of thin-walled metal structures and aluminum honeycomb structures: finite element models of collisions involving energy-absorbing structures were built in ANSYS/LS-DYNA. In these models, the thin-walled metal structure was modeled as a plastic kinematic hardening material, and the honeycomb structure was modeled as an equivalent solid model with orthotropic–anisotropic mechanical properties. The analysis showed that the safe velocity standard for rail vehicle collisions was improved from 25 km/h to 45 km/h by using a combined energy-absorbing structure; its energy absorption exceeded the sum of the energy absorbed by the thin-walled metal structure and honeycomb structure when loaded separately, because of the interaction effects of thin-walled metal structure and aluminum honeycomb structure. For an aluminum honeycomb to the same specification, the composite structure showed the highest SEA when using a thin-walled metal structure composed of bi-grooved tubes, followed by that using single-groove tubes: that with a straight-walled structure had the lowest SEA.

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