scholarly journals Composite Absorber in Collision Simulations of a Bus

2017 ◽  
Vol 15 (1) ◽  
pp. 1-5
Author(s):  
Vít Sháněl ◽  
Miroslav Španiel
Keyword(s):  
Numerical Modeling ◽  
Energy Absorption ◽  
Frontal Collision ◽  
Bus Structure ◽  
Thin Walled ◽  
The Impact

Abstract This paper details the numerical modeling of composite absorbers and an assessment of the influence of such deformation elements on a bus during frontal collision with a car. The absorber itself is designed as an assembly of thin-walled composite wound tubes oriented in the vehicle direction of travel. During the impact the tubes are crushed, causing energy absorption. Crash simulations were performed at various speeds using differing scenarios with the deformational member as well as without it. Comparative diagrams of force and velocity of the car and deformation of the bus structure were assessed

Effects of Wall Thickness and Crush Initiators Position under Experimental Drop Test on Square Tubes

2017 ◽  
Vol 865 ◽  
pp. 612-618 ◽  
Author(s):  
M. Malawat ◽  
Jos Istiyanto ◽  
D.A. Sumarsono
Keyword(s):  
Energy Absorption ◽  
Tube Wall ◽  
Impact Load ◽  
Peak Load ◽  
Load Force ◽  
Drop Height ◽  
Thin Walled ◽  
The Impact ◽  
Initial Peak ◽  
Load Mass

Crush initiators are the weakest points to reduce initial peak load force with significant energy absorption ability. The objective of this paper is to study the effects of square tube thickness and crush initiators position for impact energy absorber (IEA) performance on thin-walled square tubes. Two square tubes having thickness about 0.6 mm (specimen code A) and 1 mm (specimen Code C) were tested under dynamic load. The crushing initiator is designed around the shape of the tube wall and has eight holes with a fixed diameter of 6.5 mm. In the experiment, the crushing initiator was determined at 5 different locations on the specimen wall. These locations are 10 mm, 20 mm. 30 mm, 40 mm, and 50 mm measured from the initial collision position of the specimen tested. The impact load mass was about 80 kg and had a drop height of about 1.5 m. Using the simulation program of the LabVIEW Professional Development System 2011 and National Instrument (NI) 9234 software equipped with data acquisition hardware NI cDAQ-9174 the signal from the load cell was sent to a computer. By controlling the thickness of the thin-walled square tube, the peak loading force can be decreased by approximately 56.75% and energy absorption ability of IEA can be increased approximately to 11.83%. By using different thin-walled square tube can produce different best crush initiators position with the lowest peak load force.

scholarly journals Parameters Affecting the Specific Energy Absorption of Circular Side Impact Beam

2020 ◽  
Vol 9 (3) ◽  
pp. 3399-3405
Keyword(s):  
Energy Absorption ◽  
Specific Energy ◽  
Circular Cross Section ◽  
Side Impact ◽  
Vehicle Body ◽  
Specific Energy Absorption ◽  
Side Door ◽  
Frontal Collision ◽  
Side Collision ◽  
The Impact

In vehicle design, safety of occupants is one of the most important criteria. During side collisions, space between vehicle body and occupants is very less as compared to frontal collision. Hence, scope for energy absorption due to deformation of vehicle body in side collisions is less. The strength of side door plays important role in the framework of vehicle side body. The strength of side doors during side collision depends upon the impact beam, vehicle construction, layout of doors etc. Among the mentioned parameters, strength of impact beam is a crucial parameter. The impact beam absorbs notable amount of impact energy by deforming during side collision. Design of side impact beam should be optimum as it is limited by weight of vehicle. Parameters like material, dimensions, shape and mountings of beam inside the door are affecting the strength of side impact beam. In this work parameters of circular cross-section impact beam like diameter of beam, thickness of beam and angle of mounting inside the door are studied. Finite element simulation of side impact beam is done in ABAQUS software and its relative effects on Specific Energy Absorption (SEA) capacity of beam is studied. The simulation results are validated with available literatures. The ANOVA analysis followed by Design of Experiments is used to determine contribution of each parameter on SEA. Further various parameters of circular impact beam are studied by examining the result analysis for crashworthiness of side door.

scholarly journals A Study of Multi-Objective Crashworthiness Optimization of the Thin-Walled Composite Tube under Axial Load

Vehicles ◽  
2020 ◽  
Vol 2 (3) ◽  
pp. 438-452
Author(s):  
Mohammad Reza Seyedi ◽  
Abolfazl Khalkhali
Keyword(s):  
Failure Mechanism ◽  
Energy Absorption ◽  
Failure Modes ◽  
Matrix Material ◽  
Load Condition ◽  
Fe Model ◽  
Absorption Mechanism ◽  
Multi Objective ◽  
Thin Walled ◽  
The Impact

In recent decades, thin-walled composite components have been widely used in the automotive industry due to their high specific energy absorption. A large number of experimental and numerical studies have been conducted to characterize the energy absorption mechanism and failure criteria for different composite tubes. Their results indicate that the energy absorption characteristics depend highly on the failure modes that occur during the impact. And failure mechanism is dependent on fiber material, matrix material, fiber angle, the layout of the fibers, as well as the geometry of structure and load condition. In this paper, first, the finite element (FE) model of the CFRP tube was developed using the Tsai-Wu failure criterion to model the crush characteristics. The FE results were validated using the published experimental. Then, a series of FE simulations were conducted considering different fiber directions and the number of layers to generate enough data for constructing the GMDH-type neural network. The polynomial expression of the three outputs (energy absorption, maximum force, and critical buckling force) was extracted using the GMDH algorithm and was used to perform the Pareto-based multi-objective optimizations. Finally, the failure mechanism of the optimum design point was simulated in LS-DYNA. The main contribution of this study was to successfully model the CFRP tube and damage mechanism using appropriate material constitutive model’s parameters and present the multi-objective method to find the optimum crashworthy design of the CFRP tube.

Simulation and Analysis of Crashworthiness of Thin-Walled Structures

2010 ◽  
Vol 34-35 ◽  
pp. 747-750
Author(s):  
Xiao Yu Zhang ◽  
Le Le Zhang ◽  
Bao Fu Zhang ◽  
Cong Ma
Keyword(s):  
Numerical Method ◽  
Energy Absorption ◽  
Deformation Process ◽  
Impact Response ◽  
Impact Process ◽  
Thin Walled Structures ◽  
Thin Walled ◽  
The Impact

The deformation process and crashworthiness of the structures is the research object by the numerical method in the paper. Based on the efficient model for simulation and successful calculation, the impact response and energy absorption of four thin-walled structures has been analyzed and estimated by the simulation of impact process.

Improving the energy-absorbing properties of hybrid aluminum-composite tubes using nanofillers for crashworthiness applications

2020 ◽  
pp. 095440622094226
Author(s):  
A Praveen Kumar ◽  
D Maneiah ◽  
L Ponraj Sankar
Keyword(s):  
Energy Absorption ◽  
Metal Composite ◽  
Multiwalled Carbon ◽  
Aluminum Composite ◽  
Basalt Glass ◽  
Cylindrical Tubes ◽  
Thin Walled ◽  
Crushing Behavior ◽  
Energy Absorbing ◽  
The Impact

Thin-walled tubular configurations with hybridization concept have been gained special consideration in recent years owing to their substantial balance between light-weight characteristics and crashworthiness performance. In this context, some research studies have been concentrated on the feasibility of a thin-walled metal-composite hybrid tube. It is also eminent that the impact energy absorption capability of such hybrid tubes can further be enhanced through modification of the epoxy matrix by adding nanofillers. In this research article, aluminum-based multiwalled carbon nanotubes reinforced epoxy composite cylindrical tubes are introduced, and their corresponding quasi-static crushing behavior, subjected to lateral loading is examined experimentally. The influence of the number of fabric plies (2, 3, and 4) and type of fabric (basalt, glass) of the composite part on the crashworthiness characteristics was evaluated. The overall outcomes revealed that the proposed hybrid tube samples showed outstanding energy absorption characteristics, comprising a stable crush force–deformation response and better specific energy absorption. It is also noted that the deformation behavior and energy absorption capability of the aluminum tubes could be considerably improved by applying a nanocomposite-wrapped plies.

Energy absorption parameters of multi-cell thin-walled structure with various thicknesses under lateral loading

2020 ◽  
pp. 146442072097368
Author(s):  
M Kazemi ◽  
J Serpoush
Keyword(s):  
Design Of Experiments ◽  
Energy Absorption ◽  
Experimental Tests ◽  
Systematic Investigation ◽  
Lateral Loading ◽  
Engineering Structures ◽  
Optimal Sample ◽  
Thin Walled ◽  
Input Variables ◽  
The Impact

Energy absorbers are widely used in many engineering structures, especially mobile ones to prevent or alleviate the impact damages. Thin-walled structures are employed as an important category of energy-absorbing systems. In this study, the effect of thickness variations in different parts of a particular structure is investigated on the energy absorption behavior. The geometry of the considered structure is a four-cell squared-section of aluminum alloy 6061 that is subjected to the lateral loading and the thicknesses of the sides are defined as the input variables. For the systematic investigation of the input variables effect, design of experiments procedure is utilized. The simulations are performed by the LS-Dyna software using the finite element method based on the output data of design of experiments. Moreover, in order to ensure the accuracy and validity of the simulations, an experimental investigation has been conducted for one of the scenarios and the results are confirmed. According to the results of numerical investigations, it was found that all the input variables of the problem are effective with distinct and considerable trend in energy absorption of the structures. These trends are generally nonlinear and relative extremum can be observed in some of them. Finally, by analyzing the energy absorption process of the structures by response surface methodology, an optimal sample is selected and simulated; moreover, the identical sample is also subjected to experimental tests. The results showed approximately 272% enhancement in the specific energy absorption of the optimal sample in design of experiments table compared to the weakest one.

Crashworthiness Analysis of a Thin-Walled Structure in the Frontal Part of Automotive Chassis

2020 ◽  
Vol 12 (5) ◽  
Author(s):  
Aseem Acharya ◽  
Utkarsh Gahlaut ◽  
Kunal Sharma ◽  
Sunil Kumar Sharma ◽  
Prem Narayan Vishwakarma ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Maximum Energy ◽  
Crushing Force ◽  
Entire Vehicle ◽  
Tube Shape ◽  
Dimensional Parameters ◽  
Thin Walled ◽  
Crashworthiness Analysis ◽  
Rigid Component ◽  
The Impact

With increasing road accidents, researchers found a need to reduce the impact which gets transferred to the driver and passengers during a collision. Chassis is the main rigid component which transmits the impact or jerk to the entire vehicle. So, the changes can be done in the frontal head tube shape in order to achieve maximum energy absorption. The objective of this article is to produce a thin-walled impact absorption structure. The unique strength absorption, the maximum crushing force, all through the frontal impact are the primary dimensional parameters of the performance. Explicit dynamics feature of Ansys can be used and the results of Peak Force (PF) and Specific Energy Absorption (SEA) can be acquired virtually. Based on the results, the shape with the highest amount of SEA can be concluded as the best shape so that it can be used to absorb the maximum energy while collision of the vehicle takes place. The results show an increment of 30% in SEA.

Impact and Energy Absorption of TWB Thin-Walled Structures with Polygonal Cross-Sections

2014 ◽  
Vol 1036 ◽  
pp. 686-691
Author(s):  
Vlad Andrei Ciubotariu ◽  
Aurelian Albut
Keyword(s):  
Kinetic Energy ◽  
Energy Absorption ◽  
Cross Section ◽  
Maximum Level ◽  
Strain History ◽  
Main Role ◽  
Construction Technique ◽  
Thin Walled Structures ◽  
Thin Walled ◽  
The Impact

Nowadays, thin-walled structures and different materials destined to absorb kinetic energy initiated a great interest among the researchers from the auto, naval, military industries even from the protection equipment production industry. The main role of these structures is to absorb and dissipate the kinetic energy so the maximum level of deceleration to be limited. Thus, the structures collapse through progressive buckling. The aim is to control this progressive buckling as efficient as possible through the collapse mode or the construction technique. This collapsing mode is well described and characterised by the international literature [.The plastic strain history of the components constituting the thin-walled structure is very important because each bending, stretching process or tensioning brings with it self-a series of transformations which compete to influence the dynamic response of this kind of structures [2].In this study, all the above presented aspects were taken into consideration in the analysis of the impact and energy absorption behaviour regarding thin-walled structures by using explicit nonlinear finite element code LS_Dyna V971. The thin-walled structures involved in this research are made from tailor welded blanks (TWB) and were subject of axial impact crashing tests. There were used three types of cross-section shapes: rectangular, pentagonal and hexagonal. In order to have a fare comparison study, all the studied structures had a 250mm cross-section perimeter and a height of 250mm, also. Each structure is constituted from four, five or six sheet metal parts bonded together.

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