Investigation of Energy Absorption Behaviour of Square Aluminium Tubes with Cutouts under Axial Compression

2019 ◽  
Vol 969 ◽  
pp. 181-186
Author(s):  
L. Prince Jeya Lal ◽  
G. Yuvaraj ◽  
S. Ramesh
Keyword(s):  
Energy Absorption ◽  
Axial Compression ◽  
Progressive Collapse ◽  
Research Work ◽  
Peak Load ◽  
Compressive Force ◽  
Triggering Mechanisms ◽  
Energy Absorbers ◽  
Energy Absorbing ◽  
Passenger Cabin

Energy absorbers in the form of hollow profiles are used in automobiles to mitigate energy transfer to passenger cabin during a crash event. A similar event is carried out in this research work to study the progressive compression behaviour of aluminium tubes with triggering mechanisms in the form of cut-outs. Various hollow profiles are used as energy absorbing elements. In this work, square aluminium tubes of 50x50 mm side and 150 mm length with wall thickness of 1.5 mm with cut-outs are tested under axial compression loading and the results are compared with tubes without any cutouts. Crash parameters like minimum compressive force required to fail the aluminium tube, energy absorption, peak load and progressive collapse behaviour are studied. Results reveal that tubes with slots exhibited better crash parameters than plain tubes and tubes with circular cutouts.

scholarly journals Reversed-torsion-type crush energy absorption structure and its inexpensive partial-heating torsion manufacturing method based on origami engineering

2021 ◽  
pp. 1-31
Author(s):  
Xilu Zhao ◽  
Chenghai Kong ◽  
Yang Yang ◽  
Ichiro Hagiwara
Keyword(s):  
Energy Absorption ◽  
Peak Load ◽  
Point Of View ◽  
Building Structures ◽  
Manufacturing Method ◽  
Partial Heating ◽  
Vehicle Structure ◽  
Energy Absorbers ◽  
Energy Absorbing ◽  
Origami Engineering

Abstract Current vehicle energy absorbers face two problems during a collision in that there is only a 70% collapse in length and there is a high initial peak load. These problems arise because the presently used energy-absorbing column is primitive from the point of view of origami. We developed a column called the Reversed Spiral Origami Structure (RSO), which solves the above two problems. However, in the case of existing technology of the RSO, the molding cost of hydroforming is too expensive for application to a real vehicle structure. We therefore conceive a new structure, named the Reversed Torsion Origami Structure (RTO), which has excellent energy absorption in simulation. We can thus develop a manufacturing system for the RTO cheaply. Excellent results are obtained in a physical experiment. The RTO can replace conventional energy absorbers and is expected to be widely used in not only automobile structures but also building structures.

Key Performance Indicators of Tubes Used as Energy Absorbers

2014 ◽  
Vol 626 ◽  
pp. 155-161 ◽  
Author(s):  
T.X. Yu ◽  
Yan Fei Xiang ◽  
Min Wang ◽  
Li Ming Yang
Keyword(s):  
Energy Absorption ◽  
Carrying Capacity ◽  
Performance Indicators ◽  
Key Performance Indicators ◽  
Absorption Capacity ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Engineering Designs ◽  
Energy Absorbers ◽  
Energy Absorbing

Based on our extensive studies on the experimental, theoretical and numerical results on various tubes under axial compression/impact in the last few years, we propose a set of Key Performance Indicators (KPIs) to assess and compare the energy absorbing performance of tubular structures with various configurations, so as to guide the design of energy absorbers whilst to archive a certain degree of optimization. The KPIs have five factors: Effective stroke ratio (ESR), Non-dimensional Load-carrying capacity (NLC), Effectiveness of energy absorption (EEA), Specific energy absorption capacity (SEA), Stableness of load-carrying capacity (SLC).The paper presents a series of diagrams to compare the energy absorbing performance of various tubes in terms of the four KPIs as described above. The work is valuable to engineering designs and applications, as well as to the further studies of the topic.

Influence of the Cross Section Shape on Energy Absorbing Component of Bumper Subjected to Low Speed Crash

2013 ◽  
Vol 477-478 ◽  
pp. 3-6
Author(s):  
Yan Jie Liu ◽  
Lin Ding
Keyword(s):  
Energy Absorption ◽  
Cross Section ◽  
Peak Load ◽  
Low Velocity Impact ◽  
Fe Model ◽  
Cross Section Shape ◽  
Section Shape ◽  
The Cross ◽  
Energy Absorbing ◽  
The Impact

Energy absorbing component of bumper equipped at the front end of a car, is one of the most important automotive parts for crash energy absorption. It usually was made a mental thin walled tube. In the paper, automobile energy absorbing component at low-velocity impact was studied by using Finite Element Method. The FE model of the tube was builded by comparing the five cross section shape . Results show that the impact peak load and maximum energy absorption have certain effect to energy-absorbing component with different the cross section shape.

Axial Compression and Energy Absorption Characteristics of Reduction Tubes Using a Die under Impact Load

2013 ◽  
Vol 712-715 ◽  
pp. 1519-1526 ◽  
Author(s):  
He Mao ◽  
Kai He ◽  
Chang Jie Luo ◽  
Ru Xu Du
Keyword(s):  
Energy Absorption ◽  
Axial Compression ◽  
Impact Load ◽  
Numerical Study ◽  
Expansion Tube ◽  
Finite Element Software ◽  
Study Results ◽  
Energy Absorbers ◽  
The Relationship ◽  
Absorption Characteristics

Reduction tube using a die is a kind of deformation tubes which are used on railway train as energy absorbers. In this paper, axial compression behavior and energy absorption characteristics of reduction tubes using a die under impact load are investigated. No-linear finite element software LS-DYNA is used to conduct the numerical study. Results for the expansion tube using a die (another kind of deformation tube) and the reduction tube using a die are compared. Assuming two different structures with the same material and sectional area, an analysis shows that the energy absorption of reduction tube is better than the expansion tube. Hence, the reduction tubes using a die are investigated using a series of numerical analysis. The relationship between displacement and load, average load are obtained. The influences of impact mass and impact velocity are discussed.

Key Performance Indicators of Tubes and Foam-Filled Tubes Used as Energy Absorbers

2015 ◽  
Vol 07 (04) ◽  
pp. 1550060 ◽  
Author(s):  
Yanfei Xiang ◽  
Min Wang ◽  
Tongxi Yu ◽  
Liming Yang
Keyword(s):  
Energy Absorption ◽  
Carrying Capacity ◽  
Performance Indicators ◽  
Key Performance Indicators ◽  
Load Carrying Capacity ◽  
Tubular Structures ◽  
Load Carrying ◽  
Foam Filled ◽  
Energy Absorbers ◽  
Energy Absorbing

Based on a systematic investigation on the experimental, theoretical and numerical results on various tubes under axial compression/impact including our own tests, a set of key performance indicators (KPIs) for assessing and comparing the energy absorbing performance of tubular structures with various configurations is proposed, so as to guide the design of energy absorbers whilst to facilitate parameter optimization. The five KPIs proposed on the basis of mechanical analyses are effective stroke ratio (ESR), nondimensional load-carrying capacity (NLC), specific energy absorption (SEA), effectiveness of energy absorption (EEA) and undulation of load-carrying capacity (ULC). Moreover, by considering the influence of foam filling, these five KPIs are also modified and extended to the foam-filled tubes. The paper presents a series of diagrams to compare the energy absorbing performance of various tubes in terms of the five KPIs as described above. It transpires that the energy absorption performance of circular tubes is superior to that of square tubes. It is also confirmed that the mass of foam fillers results in reductions of SEA and EEA, though foam fillers will greatly improve the NLC of empty tubes. The novelty of the present study is displayed on the following aspects: (1) uniquely defining the effective stroke by the maximum point of "energy efficiency" f so as to avoid ambiguity which appeared in the literature; (2) instead of a single indicator such as SEA, proposing a set of five KPIs to comprehensively assess the performance of energy absorbers and (3) validating the usefulness of the proposed KPIs by comparing the performance of various tubular structures used as energy absorbers.

scholarly journals Characteristics of Rectangular Section and Double Hat Section

2019 ◽  
Vol 9 (2S4) ◽  
pp. 457-460
Keyword(s):  
Energy Absorption ◽  
Testing Machine ◽  
Primary Objective ◽  
Rectangular Section ◽  
Universal Testing ◽  
Collapse Mode ◽  
Post Test ◽  
The Difference ◽  
Energy Absorbers ◽  
Energy Absorbing

This proposal defines the difference between the double hat section tubes &rectangular section for tremble energy consumption like in crash worth applications. The primary objective of this study is to “to gather information regarding the energy absorption & impact of double and single cap section tubes and to apply them in the system where energy absorption takes place.The double-hat and thin-walled top-hat in which spot-welded by quasi-static axial method. Many tests were identified such as associated energy-absorbing characteristics and several post-test collapse mode where scrutinized and compared with other previous tests. The best model was selected by crush analysis in universal testing machine by comparison of parameters such as mean force and energy absorbers. The efficient model is selected by comparatively lesser mean force and higher energy absorption

scholarly journals Methods for absorbing kinetic energy with consideration of delay limit value

2021 ◽  
Vol 334 ◽  
pp. 01006
Author(s):  
Jarosław Rajczyk ◽  
Marlena Rajczyk ◽  
Jarosław Kalinowski ◽  
Budownictwa Wydział
Keyword(s):  
Kinetic Energy ◽  
Energy Absorption ◽  
The Body ◽  
Limit Value ◽  
Energy Absorbers ◽  
Energy Absorbing

In this paper the potential of kinetic energy absorption by means of energy absorbing and storing mechanisms was discussed. The use of energy absorbers is intended to reduce the maximum working forces when stopping the body.

scholarly journals Effect of Fiber Mat Density and Crushing Mechanism on the Energy Absorption Capacity of GFRP Crashworthy Tubes

2019 ◽  
Vol 8 (9S3) ◽  
pp. 297-301 ◽  
Keyword(s):  
Energy Absorption ◽  
Deformation Mechanism ◽  
Theoretical Calculations ◽  
Peak Load ◽  
High Energy ◽  
Constant Load ◽  
Absorption Capacity ◽  
Energy Absorption Capacity ◽  
High Energy Absorption ◽  
Energy Absorbing

The aim of this study is to examine the effect of fiber mat’s density and deformation mechanism of tubes with and without die compression. In this study a new mode of deformation mechanism of density graded GFRP circular tube is examined when they are subjected to axial compression on to a die and without die to examine its energy absorbing capacity. Theoretical calculations were made to predict the crushing stress of different specimens. It is observed that increasing density of fiber increases energy absorption value but decreases the specific energy absorption and the die could trigger progressive crushing additionally decreasing peak load. Here the compressed tube wall is compelled to be deformed towards the end of compression die with a little range of bending curvature which was forced by the radius of the die at high crushing stress and the major part of the deformation takes place at a nearly constant load, which leads to high energy absorption capacity. Comparison between theoretical prediction values by derived equations and the experimental results shows good correlation.

Effect of Cross Sectional Shape on the Energy Absorbing Characteristics of a Tube under Quasi-Static Loading

2013 ◽  
Vol 315 ◽  
pp. 334-338 ◽  
Author(s):  
Jaffar S. Mohamed Ali ◽  
Kassim A. Abdullah ◽  
Yulfian Aminanda
Keyword(s):  
Energy Absorption ◽  
Axial Compression ◽  
Cross Section ◽  
Cross Sections ◽  
Cross Sectional ◽  
Tube Cross Section ◽  
Deformation Response ◽  
Section Shape ◽  
Energy Absorbing ◽  
Sectional Shape

In this study, numerical simulation of tubes of various cross section under axial compression is carried out using LS-DYNA. The effect of varying configurations of tube cross-section shape on the deformation response, collapse mode and energy absorption characteristics of tubes under quasi-static axial compression have been studied. The validation of the finite element tube model was made by comparison with the experimental results of the square tube subjected to quasi-static axial compression. Tabulated results are presented and plots have been included for the specific energy absorption for different cross sections. The study provides an insight on ways to increasing energy absorption of light weight aluminium tubes.

Determination of a Simple Geometry for the Characterisation of the Energy Absorption Behaviour of Cast Aluminium

2014 ◽  
Vol 794-796 ◽  
pp. 628-633
Author(s):  
Matthias Hartmann ◽  
Kevin Anders
Keyword(s):  
Energy Absorption ◽  
Functional Integration ◽  
Research Work ◽  
Cross Sectional ◽  
Cast Material ◽  
Damage And Failure ◽  
Simple Geometry ◽  
Macro Scale ◽  
Energy Absorbing

Aluminium cast products are becoming more and more interesting for energy absorbing applications, as a higher functional integration can be achieved with casting processes. Therefore, it is required to find a way to characterise different aluminium alloys regarding their energy absorption behaviour. Energy absorption phenomena in materials depend on the combination of material and geometry on a macro scale level. One of the main contributions of the current research work is to show that the full realization of material absorbing capacity may not be achieved by more complex geometries. Consequently, for the characterisation of cast material under crash load, it is very important to keep the geometry influence on the energy absorption behaviour as low as possible. The ultimate aim herein is to determine an optimised geometry setup to characterise different aluminium casting materials. Three different test geometries were chosen for numerical investigations. All specimens possess the same cross-sectional area and also the same second moment of inertia. The specimens have been tested under an axial crash load at constant speed. Failure has been simulated using a Johnson-Cook damage and failure model. Their absorbing behaviours will be compared and based on the existing literature a theoretical discussion about the geometrical influence will also be given.

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