MS
7 Conclusions. In this paper, the quasi-static axial crushing behavior of a hexagonal energy absorption device named the origami crash box is studied through experiments, numerical simulation, as well as theoretical analysis. The proposed origami pattern is found to be able to trigger a diamond-shaped mode.
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On crashing behaviors of bio-inspired hybrid multi-cell Al/CFRP
The quasi-static compression test was employed to investigate their crushing characteristics, axial collapse and energy absorption behaviors, and further compared with the Al hollow counterparts. The effects of different configurations involving the radial topology, the sub-tube number, the wall thickness, and the packing …
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In-plane dynamic crushing of a novel bio-inspired re-entrant
The obvious X-shaped local shear zone first appears in the quasi-static crushing mode. When the impact velocity is high enough, inertia effect plays a leading role and the ''I''-shaped local deformation band can be observed at the impact end. The empirical formula of critical velocity is then given based on the classification diagram of ...
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(PDF) Quasi-static crushing response of square hybrid …
This study shows that square hybrid carbon/aramid tubes provide an average 57.94 J energy absorption, average 0.72 kJ/kg specific energy absorption, average 62.46 kN crushing peak load, average ...
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Bolt Custom Truck's Crew Cab Conversion Passes Roll Over Crush …
For the test, Bolt converted a Kenworth day cab truck to a four door crew cab with a 52" extension and sufficient structural support added in the cab's roof, as well as the A, B and C roof pillars in order for the truck to pass this roof crush test. Bolt Custom Trucks looks forward to offering superior and safer crew cab vehicles that meet ...
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Prediction of Crushing Response for Metal Hexagonal …
In this paper, a new method to predict the mean crushing stress and peak crushing stress of metal hexagonal honeycomb structures under out-of-plane loading has been given. In addition, experimental …
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Modeling for CFRP structures subjected to quasi-static crushing
Joosten et al. [7] described the quasi-static crushing behaviors of CFRP hat-shaped crush components by using a four-layer stacked shell model. The numerical result indicated that this modeling approach is capable to predict the failure modes more accurately and provide better agreement with the load-displacement curves generated …
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Crashworthiness Experiment and Simulation Analysis of
To reveal the energy absorbing mechanism of thin-walled circular tubes made of a T700/3234 composite, tests were first conducted to find its material properties, and then quasi-static axial crushing tests were performed to determine the failure modes and were measured by material performance tests, and the damage mechanism and …
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Lateral crushing and bending responses of CFRP square tube …
Lateral quasi-static planar crushing and three-point bending tests were performed and the numerical model was developed by means of commercial finite element (FE) software package LS-DYNA to predict the initiation of cracks within the tubal CFRP structure. The responses of CFRP tubes with reinforcement of filling aluminum …
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Axial crushing response of carbon/glass hybrid composite tubes: …
This study aimed to investigate the energy-absorbing mechanisms of composite structures subjected to quasi-static and dynamic axial crushing loads. Double hat-shaped composite tubes were prepared using carbon fiber-reinforced polymer (CFRP) and glass fiber-reinforced polymer (GFRP) composite materials.
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QUASI-STATIC AND DYNAMIC ROOF CRUSH TESTING
This study examines roof crush resistance in passenger vehicles in order to determine the correlation between roof crush performance measured quasi-statically and dynamically. …
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Optimization of the semi-hexagonal geometry of a composite crush
Quasi-static crush energy absorption capability of E-glass/polyester and hybrid E-glass–basalt/polyester composite structures. Mater Des (2015) ... several axial quasi-static compression tests are performed to compare crushing behavior and performances of between hybrid tubes together with the corresponding net aluminum …
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Crashworthiness and optimization design of quadruple
The quasi-static and dynamic three-point bending tests are first conducted for the pure quadruple-cell Al and Al/CFRP hybrid tubes. The numerical simulations are then carried out, and the influences of the partial wrapping, wrapping angle and ply thickness on the crashworthiness are analyzed.
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Cab Roof Strength Evaluation—Quasi-Static Loading Heavy Trucks
J2422_200312. This SAE Recommended Practice describes the test procedures for conducting quasi-static cab roof strength tests for heavy-truck …
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Quasi-static crushing response of square hybrid carbon/aramid …
This study shows that square hybrid carbon/aramid tubes provide an average 57.94 J energy absorption, average 0.72 kJ/kg specific energy absorption, average 62.46 …
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Safety and Crashworthiness Analysis of Composite Tube Under …
Quasi-static crush behavior of foam-filled aluminum tubes was performed by Guden et al. . Before this study, some of the research work has been done on composites to understand and predict the behavior under crushing loads but those simulation techniques are not good enough to predict the behavior of composites.
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Dynamic Crush Behaviors Of Aluminum Honeycomb Specimens …
The quasi-static and dynamic crush behaviors of aluminum 5052-H38 honeycomb specimens under out-of-plane inclined loads are investigated by experiments. Different types of honeycomb specimens were designed for crush tests under pure compressive and inclined loads with respect to the out-of-plane direction. A test fixture …
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Crushing behavior of curved Nomex honeycombs under …
Conclusions. This study presented a novel way for examining the quasi-static biaxial crushing initial yield behavior of curved hexagonal honeycombs using experiments with a specifically designed fixture and numerical analysis. The numerical model can well capture the out-of-plane quasi-static combined shear-compression …
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Crashworthiness of Aluminum-Composite Hybrid Tubes
All hybrid composite tubes had the outer diameter of 28.5 mm and the length of 100 mm, as indicated in Fig. 1. The inner aluminum part had the outer diameter of 24.5 mm and the thickness of 1 mm. The thickness of the outer braided composite part made of two layers of braided carbon fabric was 2 mm. The braided carbon fabric with 600 g/m 2 …
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Axial quasi-static crushing of composite tubes: An investigation …
Quasi-static tests are performed by crushing the composite tubes using an inwards crusher plug, an outwards crusher plug and crushing by only flat platens of the …
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Micro-Structure Analysis of Quasi-Static Crushing and Low …
Abstract Foam filled tubes (FFT) are novel structures with high energy absorption, enhanced strength to weight ratio, and tailoring capability. In the present paper, we have analyzed quasi-static uniaxial compression and low-velocity impact behavior of FFT with closed-cell metallic foam cores and functionally graded densities both …
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Numerical study of blast mitigation performance of folded …
Quasi-static crushing tests of the TSP foldcore with two different shapes of rigid Polyurethane (PU) foam as infill are carried out. Numerical model of the crushing test is then constructed and validated using the test data. The calibrated models are then used to evaluate blast mitigation performance of sacial cladding with the proposed ...
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Crashworthiness characteristics of composite cylindrical energy
where E T is the absorbed energy by the whole system, E SH is the absorbed energy by the cylindrical composite tube, E H is the absorbed energy by the honeycomb, and E F is the energy absorbed by the foam. In the subsequent section, the energy absorbed by each component is discussed. 2.1 Composite shell. While crushing a …
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quasi static crushing the truck cab
quasi static crushing the truck cab. Ver artículo. ... May 12, 2009· IIHS stated that relating the allowable amount of roof crush in the quasi-static test to the headroom in specific vehicles is a good concept but that, in practice, the agency's research tests have not shown that replacing the 127 mm (5 inch) platen travel criterion with the ...
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Fire Apparatus Purchasing: Crash Testing
Fire apparatus crash testing is a serious topic deserving serious attention. It addresses occupant survivability in a fire apparatus cab that may be involved in an accident. National Fire Protection Association (NFPA) 1901, Standard for Automotive Fire Apparatus, does not address crash testing in depth. As an example, NFPA 1901, Chapter 14 ...
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Quasi-static axial crush response and energy absorption of …
In this study, the energy absorption in the cylindrical tubes with composite-coating subjected to quasi-static axial loading is investigated. The studied parameters …
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Cab Roof Strength Evaluation—Quasi-Static Loading Heavy Trucks
J2422_200312. This SAE Recommended Practice describes the test procedures for conducting quasi-static cab roof strength tests for heavy-truck applications. Its purpose is to establish recommended test procedures which will standardize the procedure for heavy trucks. Descriptions of the test set-up, test instrumentation, …
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Numerical and Experimental Investigation of Quasi-Static …
Abstract: In this study, a numerical and experimental investigation of the quasi-static crushing behavior of steel tubular structures was conducted. As the crushing failure …
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Experimental Study on Crashworthiness of Functionally Graded …
This paper is an experimental investigation of the crashworthiness behavior of functionally graded thickness (FGT) thin-walled tubular structures. Aluminum alloy AA6061-T5 was chosen because of its high strength to weight ratio and high stiffness. A series of FGT tubes with thicknesses varying linearly from one end to the other were …
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Protection of Occupants for Survival Space as per ECE R29: A
OICA also proposed 180° rollover tests with a rigid platen inclined at 20° to the vertical with an impact of energy level 17.6 kJ. The direction of the impact is perpendicular to the longitudinal axis of the cab. In addition to this a quasi static load is applied on the same cab with a rigid platen in vertical direction as shown in figure.
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