Analysis of Energy Absorption on Pultruded Composite Tube under Oblique Loading

2011 ◽  
Vol 471-472 ◽  
pp. 215-220 ◽  
Author(s):  
Abu Bakar Sulong ◽  
Abdullah Atiq Ariffin ◽  
Jaafar Sahari ◽  
Hendra Suherman
Keyword(s):  
Energy Absorption ◽  
Wall Thickness ◽  
Impact Energy ◽  
Compression Moulding ◽  
Composite Tubes ◽  
Trigger Mechanism ◽  
Composite Tube ◽  
Automotive Structures ◽  
Oblique Loading ◽  
Force Displacement

The capability of structures to absorb as much amount energy, particularly in automotive structures to reduce the damages due to impact energy during collision attract attention of many reserachers. During the actual collision, the crash box is not only experienced axially crash, but also in oblique crash. In this study, an experiment was carried out to study the crashworthiness parameters and behaviour of pultruded fibre E-glass/polyester pultruded composite tubes under oblique loading. Quasi-static loadings were applied axially and oblique on the pultruded composite to investigate the response of force-displacement during progressive collapses. The pultruded wall thickness of 6 mm tubes were used and four oblique angles of 0˚, 5˚, 10˚ and 15˚ were selected to study their effect on crushing behaviours and collapse modes using compression moulding. All specimens were chamfer 45˚ on top end for purpose to work as a collapse trigger mechanism. The results showed that the energy absorption of the structures increasing with decrease of the loading angle.

Quasi-Static Energy Absorption of Pultruded Composite Tubes E-Glass/Polyester under Oblique Loading with Different Cross-Section

2011 ◽  
Vol 341-342 ◽  
pp. 843-847 ◽  
Author(s):  
Abdullah Atiq Arifin ◽  
Abu Bakar Sulong
Keyword(s):  
Energy Absorption ◽  
Cross Section ◽  
Thick Wall ◽  
Composite Tubes ◽  
Trigger Mechanism ◽  
Polyester Composite ◽  
Static Energy ◽  
And Behavior ◽  
Oblique Load ◽  
The Impact

The capable of structures to absorb large amount energy are great interest in an effort to reduce the impact of collision. In this research, an experimental investigation was carried out to study the crashworthiness parameter and behavior of pultruded fiber E-glass/polyester composite tubes subjected to oblique load during progressive collapses. Two different pultruded wall thicknesses of 6 mm and 9 mm tubes were used and four load angles of 0˚, 5˚, 10˚ and 15˚ were selected to study their effect on crushing behaviors and collapse modes. All specimens were chamfer 45˚ on top end as purpose to work as a collapse trigger mechanism. The result showed that increasing the angle of loading will decrease the energy absorption of the structures. Pultruded tubes with 9 mm thick wall absorb more energy compare to 6 mm thick walls.

Dynamic crashing and impact energy absorption of 3D braided composite tubes

2005 ◽  
Vol 59 (12) ◽  
pp. 1491-1496 ◽  
Author(s):  
Tao Zeng ◽  
Dai-ning Fang ◽  
Tian-jian Lu
Keyword(s):  
Energy Absorption ◽  
Impact Energy ◽  
Composite Tubes ◽  
Braided Composite

A Study of Energy Absorption Performances of Pultruded Composites under Quasi-Static Compressive Loadings

2013 ◽  
Vol 465-466 ◽  
pp. 662-666 ◽  
Author(s):  
Saiful Hadi Masran ◽  
Al Emran Ismail ◽  
Mohd Fairuz Marian
Keyword(s):  
Energy Absorption ◽  
Peak Force ◽  
Composite Tubes ◽  
Force Displacement ◽  
Pultruded Composites

This work presents a study of energy absorption performances of pultruded composite tubes under quasi-static compressive loadings. The as-received tubes were chamfered at 35, 45 and 550. The purpose of chamfered tube edge is to initiate the crushing process and to make sure the tubes were progressively collapsed under quasi-static compressive loadings. According to the present results, for 3 mm tube thickness, varying chamfering angles are not significantly affected the force-displacement curves. Except for the case of 550showed higher peak force compared with other angles. However, if the thickness is increased to 5 mm, the effect on the curves of force versus displacement is tremendous where higher chamfering angles produced higher energy absorption performances.

In-plane compression behavior of FDM-manufactured hierarchical and hybrid hierarchical hexagonal honeycombs for infrastructural safety applications

2021 ◽  
pp. 251659842110154
Author(s):  
Ashish Kumar Mishra ◽  
Arvind Kumar
Keyword(s):  
Additive Manufacturing ◽  
Energy Absorption ◽  
Uniaxial Compression ◽  
Wall Thickness ◽  
Impact Energy ◽  
Unit Cell ◽  
Fused Deposition ◽  
Cell Dimensions ◽  
Deformation Mechanics ◽  
Unit Cell Dimensions

The infrastructure safety and response to the natural or man-caused calamities has always been a top consideration for any modern project. Impact energy absorption is one such area where advanced measures are being adopted to prevent any damage to the infrastructure from any impact caused by vehicles or other elements. Honeycomb structures have been primarily used in such high impact energy absorption applications. With the advent of modern additive manufacturing practices, drastic modifications to the simple honeycombs generally used are possible, thus expanding the reach and capability of these structures. In this article, in-plane uniaxial compression performance of hybrid and hierarchical hexagonal honeycombs has been studied in the context of strain energy absorption for in-plane impact such as the case of vehicle collision to the pillars of flyover or bridges. The polylactic acid (PLA) filament has been used to manufacture the honeycombs through fused deposition modeling (FDM) additive manufacturing technique. Simple hexagonal honeycombs have been studied first at low deformation speed to understand the deformation mechanics under uniaxial compression and its dependence on the unit cell dimensions and cell wall thickness. The effect of transition to the hybrid and hierarchical hexagonal honeycombs on the compression deformation has been highlighted next. While the hierarchical structures show better energy absorption capabilities and plateau stress, the hybrid hexagonal honeycombs show their high loadresistance. Dependence of the mechanical performance of such structures on the unit cell dimensions, orientation and wall thickness has also been examined through detailed experimental analysis.

Crashworthy Landing Gear Design Using a Composite Tube by Extra Energy Absorber

2014 ◽  
Author(s):  
Tae-Uk Kim ◽  
Sung Joon Kim ◽  
Seunggyu Lee
Keyword(s):  
Energy Absorption ◽  
Shock Absorber ◽  
Numerical Solutions ◽  
Landing Gear ◽  
Relief Valve ◽  
Composite Tubes ◽  
Additional Energy ◽  
Energy Absorber ◽  
Composite Tube ◽  
Extra Energy

Landing gear is the one of the key components for improving aircraft crashworthiness because its primary function is the energy absorption. But, in general, the shock absorbers are designed to have best efficiency for normal landing cases and can be ineffective when faced with very high sink speed. Thus special design and implementation are necessary for landing gear to have crashworthiness. For this purpose, various concepts have been studied and put to practical use such as structural pin, pressure relief valve and additional energy absorbing devices, etc. In this paper, the composite tube is investigated as an extra energy absorber and adopted to landing gear to increase shock absorbing performance in case of crash. To do this, first the quasi-static and impact test of composite tubes are conducted and the analysis model is tuned to explain the test results. During the correlation process, the failure modes and the specific energy absorption of the composite tubes are analyzed and the optimal configurations are searched. The overall performance of landing gear including the composite tube is analyzed by developing a simplified dynamic model. Each force-stroke relation of oleo-pneumatic shock absorber, tire and composite tube are modeled as spring and damper, then the equation of motion is solved to obtain the crash responses. In this model, after the bottoming of shock absorber, the crushing of composite tube is activated for additional energy absorption. Numerical solutions show that the enhanced shock absorbing capability in case of crash when the composite tube adopted. For practical use, the landing gear performance should be verified by drop tests and this is author’s future research project.

scholarly journals Study on improvement of prefolded energy absorption device to constant resistance and its mechanical properties

2021 ◽  
Vol 104 (3) ◽  
pp. 003685042110368
Author(s):  
Dong An ◽  
Jiaqi Song ◽  
Hailiang Xu ◽  
Jingzong Zhang ◽  
Yimin Song ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Energy Absorption ◽  
Compression Test ◽  
Side Wall ◽  
Concave Side ◽  
Displacement Curve ◽  
Static Compression ◽  
Constant Resistance ◽  
The Impact ◽  
Force Displacement

When the rock burst occurs, energy absorption support is an important method to solve the impact failure. To achieve constant resistance performance of energy absorption device, as an important component of the support, the mechanical properties of one kind of prefolded tube is analyzed by quasi-static compression test. The deformation process of compression test is simulated by ABAQUS and plastic strain nephogram of the numerical model are studied. It is found that the main factors affecting the fluctuation of force-displacement curve is the stiffness of concave side wall. The original tube is improved to constant resistance by changing the side wall. The friction coefficient affects the folding order and form of the energy absorbing device. Lifting the concave side wall stiffness can improve the overall stiffness of energy absorption device and slow down the falling section of force-displacement curve. It is always squeezed by adjacent convex side wall in the process of folding, with large plastic deformation. Compared with the original one, the improved prefolded tube designed in this paper can keep the maximum bearing capacity ( Pmax), increase the total energy absorption ( E), improve the specific energy absorption (SEA), and decrease the variance ( S2) of force-displacement curve.

Sign in / Sign up

Export Citation Format

Share Document