Design, FEM Analysis and Compression Tests on Energy-Absorbing Property of Disordered Cellular Solids Developed by 3D-Voronoi Division

2020 ◽  
Vol 61 (717) ◽  
pp. 197-203
Author(s):  
Takuya HAMAGUCHI ◽  
Shiyue GUO ◽  
Satoshi TAKATAMA ◽  
Koichi KITAZONO
Keyword(s):  
Fem Analysis ◽  
Cellular Solids ◽  
Compression Tests ◽  
Absorbing Property ◽  
Energy Absorbing

scholarly journals Investigation of Energy-Absorbing Properties of a Bio-Inspired Structure

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 881
Author(s):  
Adrian Dubicki ◽  
Izabela Zglobicka ◽  
Krzysztof J. Kurzydłowski
Keyword(s):  
Absorption Capacity ◽  
Compression Tests ◽  
Element Analysis ◽  
Lightweight Structures ◽  
New Energy ◽  
Absorbing Material ◽  
Lightweight Structure ◽  
3D Printed ◽  
Deformation Force ◽  
Energy Absorbing

Numerous engineering applications require lightweight structures with excellent absorption capacity. The problem of obtaining such structures may be solved by nature and especially biological structures with such properties. The paper concerns an attempt to develop a new energy-absorbing material using a biomimetic approach. The lightweight structure investigated here is mimicking geometry of diatom shells, which are known to be optimized by nature in terms of the resistance to mechanical loading. The structures mimicking frustule of diatoms, retaining the similarity with the natural shell, were 3D printed and subjected to compression tests. As required, the bio-inspired structure deformed continuously with the increase in deformation force. Finite element analysis (FEA) was carried out to gain insight into the mechanism of damage of the samples mimicking diatoms shells. The experimental results showed a good agreement with the numerical results. The results are discussed in the context of further investigations which need to be conducted as well as possible applications in the energy absorbing structures.

Friction Welding of Thixocast A356 Aluminium Alloy

2012 ◽  
Vol 192-193 ◽  
pp. 305-310 ◽  
Author(s):  
Shailesh K. Singh ◽  
Kamanio Chattopadhyay ◽  
Pradip Dutta
Keyword(s):  
Finite Element Method ◽  
Friction Welding ◽  
Flow Behavior ◽  
A356 Alloy ◽  
Welding Process ◽  
Fem Analysis ◽  
Compression Tests ◽  
Cast Material ◽  
A356 Aluminium Alloy ◽  
Conventionally Cast

In this paper, a numerical model for friction welding of thixo-cast materials is developed, which includes a coupling of thermal effect and plastic deformation using a finite element method (FEM). As the constitutive equations for flow behavior of materials for a thixo-cast material are expected to be different from those of conventionally cast material of the same alloy, the necessary material data are experimentally determined from isothermal hot compression tests of the A356 thixocast alloy. The Johnson-Cook model has been employed to represent the flow behavior of the thixocast A356 alloy. The purpose of this FEM analysis is to provide better understanding of the friction welding process of thixo-cast material, and to obtain optimized process parameters before an actual welding is carried out.

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.

Impact Energy Absorbing System for Space Lander Using Hemispherical Open-Cell Porous Aluminum

2018 ◽  
Vol 933 ◽  
pp. 337-341 ◽  
Author(s):  
Koichi Kitazono ◽  
Raita Tada ◽  
Yoshikazu Sugiyama ◽  
Toko Miura
Keyword(s):  
Heat Treatment ◽  
Selective Laser Melting ◽  
Impact Energy ◽  
Melting Process ◽  
Compression Tests ◽  
Laser Melting ◽  
Open Cell ◽  
Porous Aluminum ◽  
Suitable Heat Treatment ◽  
Energy Absorbing

Impact energy absorbing system for space lander is an important technology for space exploring missions. Open-cell porous aluminum manufactured through 3D selective laser melting process has been used on the energy absorbing system. Compression tests for cylindrical and hemispherical shaped porous aluminum with different porosities revealed the high potential as an energy absorbing component. It was found that the suitable heat treatment were effective to increase the energy absorbing potential of the porous aluminum.

Effect of Laser Forming on the Energy Absorbing Behavior of Metal Foams

2021 ◽  
pp. 1-29
Author(s):  
Tom Zhang ◽  
Yubin Liu ◽  
Nathan Ashmore ◽  
Wayne Li ◽  
Y. Lawrence Yao
Keyword(s):  
Metal Foam ◽  
Laser Forming ◽  
Compression Tests ◽  
Forming Process ◽  
Static Compression ◽  
Closed Cell ◽  
Similarities And Differences ◽  
Energy Absorbing ◽  
The Impact ◽  
Quasi Static Compression

Abstract Metal foam is light in weight and exhibits an excellent impact absorbing capability. Laser forming has emerged as a promising process in shaping metal foam plates into desired geometry. While the feasibility and shaping mechanism has been studied, the effect of the laser forming process on the mechanical properties and the energy absorbing behavior in particular of the formed foam parts has not been well understood. This study comparatively investigated such effect on as-received and laser formed closed-cell aluminum alloy foam. In quasi-static compression tests, attention paid to the changes in the elastic region. Imperfections near the laser irradiated surface were closely examined and used to help elucidate the similarities and differences in as-received and laser formed specimens. Similarly, from the impact tests, differences in deformation and specific energy absorption were focused on, while relative density distribution and evolution of foam specimens were numerically investigated.

Study on Preparation Method and Energy-Absorbing Characteristics of Carbon Fiber Composite Energy Absorber

2013 ◽  
Vol 442 ◽  
pp. 98-103
Author(s):  
Chang Jie Luo ◽  
Hai Liang Zhang ◽  
Wen Ze Yu ◽  
Kai He ◽  
Ru Xu Du
Keyword(s):  
Carbon Fiber ◽  
Preparation Method ◽  
Fiber Composite ◽  
Compression Tests ◽  
Carbon Fiber Composite ◽  
Energy Absorber ◽  
Static Compression ◽  
Advantages And Disadvantages ◽  
Energy Absorbing ◽  
Composite Energy

By analyzing advantages and disadvantages of the existing energy absorbers, carbon fiber composite and regular hexagon honeycomb structure were chosen as material and topological structure respectively to make a big-bearing, lightweight energy absorber. Preparation method of carbon fiber composite honeycomb energy absorber was studied, which was applied to manufacture some specimens,and it is feasible because of the specimens good consistency and regularity. Quasi-static compression tests of the specimens were carried out, and then the related parameters of energy-absorbing characteristics were calculated. The results show that the carbon fiber composite honeycomb energy absorber has excellent energy-absorbing characteristics.

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.

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