axial crushing of tubes as an energy dissipating mechanism
Crushing Equipment&Grinding Equipment
Energy Absorbing Damage Mechanisms in Progressive
Energy dissipation due to various failure modes in axial compression of unidirectional PMC tubes Conference Ghouri, M I.A. ; Newaz, G M Composite materials exhibit high energy absorption compared to conventional materials because of the progressive nature of the damage process.
Expansion of circular tubes by rigid tubes as impact
In this study, expansion of deformable tubes by a rigid tube is introduced as a new mechanism of dissipating energy. In this mechanism of dissipating energy, there is a specific clearance between the surfaces of the rigid and deformable tubes, and the rigid tube is press-fitted onto the top end of the deformable one up to 30 mm. when this arrangement of dissipating energy is subjected to axial
Some improvements on the energy absorbed in axial plastic
The control of the plastic ﬂow mechanism during axial collapse of metallic hollow cylinders is of particular interest in the present work for the absorbed energy. Hence, an experimental methodology is developed during which some dif- ferent tubular structures are loaded under compressive quasi-static strain rate. These structures of various geometrical parameters g = R
Crushing of axially compressed steel tubes filled with
The experimental results for the square tubes reveal efficiency improvements with respect to energy absorption of up to 60%, resulting from changed buckling modes of the tubes and energy dissipation during the compression of the material itself. The principal features as well as the changes of the crushing process due to filling can also
The characteristics of a number of metal components proposed as impact energy absorbers are reviewed, attention being focussed on to modes of deformation which stem from the axial compression of metal tubes. Progressive buckling, inversion and splitting are discussed and areas for future work identified. The buckling of thin-walled square section tubes filled with
tubes under axial crushing. Results have shown that the total absorbed energy of the DSC aluminum tube with 14 corrugations was 330% and 32% higher than that of the SSC tube with 14 corrugations and the S-tube, respectively. The second part of this research work is
incorporation of a trigger mechanism by means of a groove managed to reduce the high initial peak force while maintaining the energy absorption performance. G.H. Daneshi and S.J. Hosseinipou  carried out experimental work on grooved thin walled tubes subjected to axial compression. The function of the groove in the t ube is to force the plastic deformation to
D 3.2. Modelling, analysis and validation of energy absorbers
The best mechanism for energy dissipation is the axial crushing, so it is suggested to work on new energy absorbers concepts based on axial crushing. Anyway, the most important parameter that ﬁnally will be evaluated is HIC (Head Injury Criterion) and maybe a ﬁnal proposal proposes using other mechanisms of energy absorption. Therefore, the behavior of thin-walled tubes under axial
Crashworthiness Investigation and Optimization of Empty
Crashworthiness Investigation an d Optimization of Empty and Filled Composite Crash Box 345 show that tubes crush in a progressive manner, i. e. the crushing starts from triggered end of the tubes, exhibit delamination between the layers. Two finite element models, namely single layer and multi layers, are developed.
Axial crushing energy dissipation behavior of compoundAxial crushing energy dissipation behavior of glass/epoxy round tubes is investigated both dynamically and quasi statically . 。 3. Energy dissipation mechanism are studied for different tube models, .
application of multi-cornered thin-walled tubes as energy absorbing members . Abbasi et al.  investigated the crushing behavior and energy absorption of hexagonal, octagonal and 12-edge thin-walled columns. Reddy et al.  investigated a similar problem for 12-edge columns with varying geometry. Ali et al.  analyzed the axial crushing of pentagonal and cross-shape thin-walled tubes
devices to absorb energy. Axial crushing of frusta tubes has long been the subject of extensive research [14-17], these researches had studied the effect of the deformation on energy absorbing and mean axial loading for different materials such as steel and aluminum as well as the nonmetallic tube like the rigid PVC. In the present work, experimental study on Polyvinylchloride frusta tubes
Crashworthiness assessment of auxetic -filled tube under quasi-static axial loading. Materials & Design, 2021. Zaini Ahmad. R. Alipour. Mozafar Shokri Rad. Zaini Ahmad. R. Alipour. Mozafar Shokri Rad. Download with Google Download with Facebook or download with email. Crashworthiness assessment of auxetic -filled tube under quasi-static axial loading
Review of the crushing response of collapsible tubular
Review of the crushing response of collapsible tubular structures Vivek PATEL( ), Gaurav TIWARI, Ravikumar DUMPALA Department of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur 440010, India
Experimental and numerical crashworthiness investigation
Experimental and numerical crashworthiness investigation of hybrid composite aluminum tubes under dynamic axial and oblique loadings H. R. Zarei Aeronautical University of Science and Technology, Tehran, Iran. Abstract This research deals with axial and oblique impact crash tests on simple and hybrid composite tubes. Axial and oblique impact tests have been generated on
The crashworthiness performance of stacking sequence
A crushing tube of HTS-45A clearly formed the internal and external fronds along the fibre line (undulation) which provides a significant contribution to the energy dissipation mechanism despite the collapsed tube of the distinct lamina in bundles. Therefore, in this mode, the main energy absorption mechanism is fibre debonding and matrix fragmentation.
Paper Title (use style paper title) ER Publications
Usually, these devices consist of a hollow steel beam which collapses in axial crushing when a frontal collision occurs, dissipating part of its energy through plastic deformation. With increasing advances in technology, the need for creative initiatives to increase safety levels, particularly for transportation systems are essential. To avoid
Axial crushing energy dissipation behavior of glass/epoxy round tubes is investigated both dynamically and quasi-statically. Three macroscopic collapse modes are observed and summarized during the stable crushing process they are lamina bending, local buckling and transverse shearing. From the view-point of microscopic mechanism, energy dissipation mechanisms are studied for different macro
Finite element analysis of hexagonal tube structures under
Finite element analysis of hexagonal tube structures under axial loading M. R. Said1, R. Ahmad2 & A. Alias3 1of elastic half wavelength and plastic fold length during the crushing of rectangular tubes. It is noted that the plastic fold length depends on the elastic wavelength, which can also be found from the deformation pattern. Abramowicz and Wierzbicki  developed
Thin-walled tubes are one of the widely used impact energy absorbing elements in crash safety applications such as aircrafts, ships and automotive vehicles due to their excellent energy absorbing capacity, light weight, and uniform mean crushing force. These tubular energy absorbers dissipate the impact energy by plastic deformation so
Impact Energy Absorption of Concentric Circular Tubes
of the square tubes while retaining its progressive deformation mode and favourable energy absorption capability. 2.2 Characteristics of Energy Absorber The capability of an energy absorber in dissipating the impact energy depends on the extent of plastic deformation behavior of the metallic structures.
Mechanics of Energy Absorption by Progressive Plastic
axial loading was developed by Chirwa . Energy dissipation was due to tube bending, circumferential stretching, buckling and friction between the tube and dies. An analytical model of a square column subjected to axial crushing was developed by Wierzbicki and ∗Corresponding author [email protected] c 2021 NSP Natural Sciences
The static and dynamic axial crumbling of thin-walled
In the present paper we report on the behaviour and crashworthiness characteristics of square composite tubes subjected to static and dynamic axial compression exerted by a hydraulic press and a drop-hammer, respectively. The effect of specimen geometry, i.e. of thickness and axial length, and of the loading rate on the energy absorbing capability are studied in detail. Attention is directed
Partial Contents Laterally Compressed Metal Tubes as Impact Energy Absorbers; The Static Approach to Plastic Collapse and Energy Dissipation in Some Thin-walled Steel Structures; Crushing Behaviour of Plate Intersections; Energy Absorption by Structural Collapse; Axial Crushing of Fibre Reinforced Composite Tubes; Impact Scalability of Plated Steel Structures;
CRUSHING OF COMPOSITE TUBULAR STRUCTURES AND ENERGY
Keywords Crushing, Composite tubes, Energy dissipation, Specific Energy Absorption, Aeronautics Abstract The purpose of this study is to evaluate and compare the ability of diverse composite structures to dissipate the energy generated during a crash. To this end, composite tubes
Kinetic energy dissipation system for dissipating kinetic
08/01/2021 · Kinetic energy dissipation system for dissipating kinetic shock energy . United States Patent 8347775 . Abstract An energy dissipation assembly is provided for mounting between a fixed support and moveable support. The assembly includes a sacrificial deformation tube, a hardened cutter/deflector assembly and, optionally, a connecting cable to maintain the
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Theoretical prediction of the progressive buckling and
Theoretical prediction of the progressive buckling and energy absorption of the sinusoidal corrugated tube subjected to axial crushing. Authors Wenqian Hao Bi-inspired and Advanced Energy Research Center, Department of Engineering Mechanics, Northwestern Polytechnical University, Xian 710129, ChinaJiamiao Xie Bi-inspired and Advanced Energy Research Center, Department of Engineering