Energy Absorption Capability of 3D Braided-Textile Composite Tubes with Rectangular Cross Section

2007 ◽  
Vol 334-335 ◽  
pp. 581-584 ◽  
Author(s):  
Yu Qiu Yang ◽  
Asami Nakai ◽  
Tadashi Uozumi ◽  
Hiroyuki Hamada
Keyword(s):  
Energy Absorption ◽  
Cross Section ◽  
Rectangular Cross Section ◽  
3D Structure ◽  
Textile Composite ◽  
Central Crack ◽  
Composite Tube ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Holding Back

Fiber Reinforced Plastics (FRPs) are now under research as crush element because of its contribution in energy absorption. The 3D-textile braiding was introduced in this study as a reinforcement form of fibers. The CFRP square tubes with rectangular cross section were tested in quasi-static experiments. The results show that 3D structure was effective in holding back the propagation of the central crack and the composite tube with a design on the corners could perform better energy absorption capability.

Simulation and Experimental Investigation of Impact Damage in Composite Shell

2005 ◽  
Vol 297-300 ◽  
pp. 1339-1343 ◽  
Author(s):  
Gui Ping Zhao ◽  
Chong Du Cho ◽  
Oh Yang Kwon
Keyword(s):  
Energy Absorption ◽  
Impact Damage ◽  
Displacement Transducer ◽  
Cfrp Laminates ◽  
Three Point Bending ◽  
Reinforced Plastics ◽  
Side Door ◽  
Impact Tester ◽  
Fiber Reinforced Plastics ◽  
The Impact

In this paper, the energy absorption characteristics on extruded aluminum box-section strengthened with carbon-fiber-reinforced plastics (CFRP) laminates and/or foam material were investigated under impact loading. Impact tests using a pneumatic impact tester were conducted with the specimens in three-point bending flexure with consideration given to the side-door impact beams in vehicles. The absorbed energy to the specimen during the impact was determined from the loaddisplacement curve, which was obtained from the strain gauge attached to the impactor and the laser displacement transducer. From the results, it was found that the strengthening by externally bonding with CFRP laminates improved the impact-induced energy absorption. Also, the effect of the improvement was clearly seen in the case of the use of filling form material in the aluminum extrusion together with attaching CFRP laminates.

Experimental and Numerical Study of the Energy Absorbed with Various Thickness of Thin Rectangular and Square Sections

2012 ◽  
Vol 229-231 ◽  
pp. 1120-1124
Author(s):  
Sajjad Dehghanpour ◽  
Sobhan Dehghanpour
Keyword(s):  
Numerical Analysis ◽  
Energy Absorption ◽  
Cross Section ◽  
Numerical Study ◽  
Rectangular Cross Section ◽  
Lateral Loading ◽  
Thin Walled

Impact is one of very important subjects which always have been considered in mechanical science. Nature of impact is such that which makes its control a hard task. Therefore it is required to present the transfer of impact to other vulnerable part of a structure, when it is necessary, one of the best method of absorbing energy of impact , is by using Thin-walled tubes these tubes collapses under impact and with absorption of energy, it prevents the damage to other parts. Purpose of recent study is to survey the deformation and energy absorption of tubes with different type of cross section (rectangular or square) and with similar volumes, height, mean cross section, and material under loading. Lateral loading of tubes are quasi-static type and beside as numerical analysis, also experimental experiences has been performed to evaluate the accuracy of the results. Results from the surveys is indicates that in a same conditions which mentioned above, samples with square cross section ,absorb more energy compare to rectangular cross section, and also by increscent in thickness, energy absorption would be more.

DESIGN OF THE CROSS SECTION SHAPE OF AN ALUMINUM CRASH BOX FOR CRASHWORTHINESS ENHANCEMENT OF A CAR

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5578-5583 ◽  
Author(s):  
S. B. KIM ◽  
H. HUH ◽  
G. H. LEE ◽  
J. S. YOO ◽  
M. Y. LEE
Keyword(s):  
Energy Absorption ◽  
Cross Section ◽  
Cross Sections ◽  
Rectangular Cross Section ◽  
Local Buckling ◽  
Absorption Capacity ◽  
Experimental Result ◽  
Displacement Curve ◽  
Front Side ◽  
Auto Body

This paper deals with the crashworthiness of an aluminum crash box for an auto-body with the various shapes of cross section such as a rectangle, a hexagon and an octagon. First, crash boxes with various cross sections were tested with numerical simulation to obtain the energy absorption capacity and the mean load. In case of the simple axial crush, the octagon shape shows higher mean load and energy absorption than the other two shapes. Secondly, the crash boxes were assembled to a simplified auto-body model for the overall crashworthiness. The model consists of a bumper, crash boxes, front side members and a sub-frame representing the behavior of a full car at the low speed impact. The analysis result shows that the rectangular cross section shows the best performance as a crash box which deforms prior to the front side member. The hexagonal and octagonal cross sections undergo torsion and local buckling as the width of cross section decreases while the rectangular cross section does not. The simulation result of the rectangular crash box was verified with the experimental result. The simulation result shows close tendency in the deformed shape and the load–displacement curve to the experimental result.

An Experimental Study on the Axial Collapse Characteristics of Hybrid Side Member

2006 ◽  
Vol 324-325 ◽  
pp. 411-414
Author(s):  
Kil Sung Lee ◽  
Kwang Hee Im ◽  
In Young Yang
Keyword(s):  
Energy Absorption ◽  
Collapse Mechanism ◽  
Side Member ◽  
Specific Strength ◽  
Reinforced Plastics ◽  
Collapse Characteristics ◽  
Collapse Mode ◽  
Fiber Reinforced Plastics ◽  
Strength And Stiffness ◽  
Shaped Section

The purpose of this study was to develop lightweight hat shaped section side members which absorb the most of the energy during the front-end collision of vehicle. The hybrid side member was manufactured by combination of aluminum and CFRP. An aluminum or CFRP (Carbon Fiber Reinforced Plastics) member is representative lightweight materials but its axial collapse mechanism is different from each other. The aluminum member absorbs energy by stable plastic deformation, while the CFRP member absorbs energy by unstable brittle failure with higher specific strength and stiffness than those in the aluminum member. Based on the respective collapse characteristics of CFRP side and aluminum members, the hybrid side members were tested on the axial collapse loads to get a synergy effect when the member is combined with the advantages of each members, such as energy absorption by the stable folding deformation of the aluminum member and by the high specific strength and stiffness of the CFRP member. Energy absorption capability and collapse mode of the hybrid side members were analyzed.

The Static Collapse Characteristics of CFRP Side Members Due to Stacking Condition

2006 ◽  
Vol 326-328 ◽  
pp. 1055-1058
Author(s):  
Kil Sung Lee ◽  
In Young Yang
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Energy Absorption ◽  
Safety Performance ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Stacking Condition ◽  
Static Collapse

Currently, stacking condition related to the energy absorption of composite materials is being considered as an issue for the structural efficiency and safety of automobiles, aerospace vehicles, trains, ships even elevators during collision. In particular, CFRP (carbon fiber reinforced plastics) composite materials have found wide applicability because of their inherent design flexibility and improved material properties. The most important objective in designing automobiles is currently to focus on environment-friendly aspect and safety performance aspect. Therefore, the designing automobile should be more concerned on the aspect of securing safety performance, but at the same time, it also should consider reducing weight of automobile structural member. In this study, CFRP (Carbon Fiber Reinforced Plastics) side members with single-hat-section shaped were manufactured. The axial static collapse tests were performed for the members using universal testing machine, and the collapse mode and energy absorption characteristics were analyzed according to stacking condition such as fiber orientation angle and shape of the section.

Fatigue Properties of the Cell 3D Composite Structure

2012 ◽  
Vol 152-154 ◽  
pp. 1413-1416
Author(s):  
Milan Růžička ◽  
Jiří Had ◽  
Ondřej Uher
Keyword(s):  
Cross Section ◽  
Composite Structure ◽  
Rectangular Cross Section ◽  
Cell Structure ◽  
Hybrid Cell ◽  
3D Structure ◽  
Cell System ◽  
Unidirectional Composite ◽  
Fatigue Properties ◽  
Static Fatigue

A novel type of hybrid cell composite structure has been developed, experimentally investigated and used for many practical applications. The cell system can fill relatively thick parts of cross sections of beams with lower risk of shear stress damage and cracks between uniaxial oriented fibres. Typical macroscopic sub-cells in the cross section structure are formed by the stamping process of partially cured and axially-oriented high modulus carbon fibre bundles (about 4-6 mm in the diameter), which are wrapped around by a thin layer of high strength fibres (oriented in ±45 or 89 degrees). An advantage of this final 3D cell composite structure is its higher static and fatigue strength and shear stiffness in comparison with thick unidirectional composite parts. Static, fatigue and residual static strength was experimentally investigated for 1D unidirectional as well as for 3D cell structure under four point bending loading on specimens with the rectangular cross section. The 3D structure shows much better static and fatigue properties as the thick 1D unidirectional structure.

Assessment of Effectiveness of Date Palm Fibers in Foam Filled CFRP Energy Absorption Devices

2017 ◽  
Vol 735 ◽  
pp. 83-88 ◽  
Author(s):  
Tamer A. Sebaey ◽  
Elsadig Mahdi
Keyword(s):  
Energy Absorption ◽  
Date Palm ◽  
Peak Load ◽  
Hybrid Energy ◽  
Reinforced Plastics ◽  
Lower Weight ◽  
Date Palm Fibers ◽  
Foam Filled ◽  
Fiber Reinforced Plastics ◽  
Liquid Foam

The effectiveness of date palm fibers as a second order filler was assessed in octagonal/hexagonal hybrid energy absorption devices.. The cells inside the device were made from carbon fiber-reinforced plastics CFRP whereas; the outer skin was of Aramid/epoxy. The energy absorption devices were filled by date palm fibers and then the liquid foam was applied. The idea is to use the fibers to absorb the energy in various damage mechanisms and use the foam as a binder. The comparison showed higher peak load and average crushing load (for some cases) for the specimens filled with date palm and foam together. On the other hand, the specimens filled with foam only showed higher stroke efficiency and lower weight which led to a higher specific energy absorption.

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