scholarly journals Energy Absorption Mechanism and Its Influencing Factors for Circular Concrete-Filled Steel Tubular Members Subjected to Lateral Impact

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4652
Author(s):  
Luming Wang ◽  
Yanhui Liu ◽  
Lang Yang ◽  
Nan Xu ◽  
Shichun Zhao
Keyword(s):  
Energy Absorption ◽  
Steel Tube ◽  
Absorption Characteristic ◽  
Lateral Impact ◽  
Absorption Process ◽  
Tube Material ◽  
Absorption Mechanism ◽  
Concrete Material ◽  
Important Indicator ◽  
The Impact

The energy absorption characteristic of steel tube material and concrete material is an important indicator to reflect the impact resistance of circular concrete-filled steel tubular (CFST) members. In order to efficiently simulate the material energy absorption of the steel tube and concrete under lateral impact, a nonlinear finite element model considering the material strain rate of the circular CFST member was established and validated based on the drop weight tests. Then, the energy absorption mechanism of circular CFST members subjected to lateral impact was investigated including the revelation of the energy absorption process and the determination of the energy absorption distribution for the steel tube material and concrete material, which are obtained respectively based on the comprehensive analysis of dynamic response and innovative establishment of the segmented numerical model. In addition, the influence of impact momentum on energy absorption process and the effect of impact location on energy absorption distribution are further carried out. The observations of this investigation can provide reference for the anti-impact design and damage reinforcement of circular CFST members subjected to lateral impact.

Energy Absorption Mechanisms and Crash Analysis of Helicopter Seats

2018 ◽  
Author(s):  
Gülce Özturk ◽  
Altan Kayran
Keyword(s):  
Plastic Deformation ◽  
Energy Absorption ◽  
Strain Curve ◽  
Rigid Wall ◽  
Absorption Mechanism ◽  
Dynamic Simulations ◽  
Explicit Finite Element ◽  
Energy Absorbing ◽  
The Impact ◽  
Aluminum Material

In this paper, a crushable absorber system is designed to analyze the dynamic behavior and performance of a helicopter seat. The mechanism of the absorption system makes use of the crash energy to plastically deform the aluminum material of the seat legs. Seat structure is composed of a bucket, two legs and two sliding parts on each leg. Seat legs are made of aluminum and and the sliding parts of the seat are steel. During the impact event, the heavier sliding parts move down and crash the aluminum material for the purpose of deforming the aluminum material under the sliding parts and reduce the crash energy. The designed helicopter seat is analyzed using the explicit finite element method to evaluate how the seat energy absorbing mechanism works. Dynamic simulations are performed in ABAQUS by crashing the seat to a fixed rigid wall. To simulate the plastic deformation, true stress-strain curve of the aluminum material of the seat leg has been used. Time response results are filtered to calculate the meaningful g loads which incur damage to the occupants. Analyses are performed with and without the energy absorption mechanism in order to see the effectiveness of the energy absorption mechanism on the human survivability by comparing the g loads on the seat bucket with the acceptable loads specified by EASA. This study is a preliminary study intended to check the effectiveness of the damping mechanism based on the plastic deformation of the aluminum legs of the seat in the event of a crash.

Study on the Impact Response of Concrete Filled FRP-Steel Tube Structures

2011 ◽  
Vol 368-373 ◽  
pp. 549-552
Author(s):  
Chen Chen ◽  
Ying Hua Zhao ◽  
Chun Yang Zhu ◽  
Li Wei
Keyword(s):  
Impact Load ◽  
Steel Tube ◽  
Fiber Reinforced Polymer ◽  
Experimental Result ◽  
Lateral Impact ◽  
Steel Tubes ◽  
Impact Performance ◽  
Reinforced Polymer ◽  
The Impact ◽  
Frp Sheet

This paper studies the impact performance of concrete filled FRP-steel tube which is a composed structure made by filling concrete into steel tube and wrapping outside with fiber reinforced polymer (FRP) sheet. Numerical simulations have been conducted to study the dynamic response of fixed-pined supported beams of concrete filled FRP-steel tubes. The finite element models of concrete filled FRP-steel tubes are established to analyse its lateral impact dynamic characteristics under different loading situations, with respective kinds of FRP and thicknesses of steel tubes. The impact force and displacement histories were recorded. Comparing to the traditional concrete filled steel tube structure, the concrete filled FRP-steel tube indicates a promising structure with more advantages in the mechanical and constructional performance. Especially with its higher loading-carrying capacity and better toughness, it is more adaptable for the structures subjected to accidental impact load. Analytical solution is compared with experimental result to show the correctness and the effectiveness of present study.

Analysis and Application of the Impact Absorption Behavior of the Composite Tube

2013 ◽  
Vol 470 ◽  
pp. 510-515
Author(s):  
Zi Peng Zhang ◽  
Gui Fan Zhao ◽  
Tso Liang Teng ◽  
Yang Wang
Keyword(s):  
Energy Absorption ◽  
Absorption Characteristic ◽  
Beam Model ◽  
Velocity Signal ◽  
Composite Tube ◽  
Acceleration Signal ◽  
Displacement Signal ◽  
Drop Weight Tear Test ◽  
Composite Energy ◽  
The Impact

Composite tube is one new kind of multi-material shell structures. It has both of metal and composite energy absorption advantage. In order to find the energy absorption characteristic of composite tube and put it into use, the Drop-Weight Tear Test (DWTT) was carried out. The LD2Y aluminum was chosen as the inner metal material which was wrapped fiberglass epoxy composite outside. During the test, the displacement signal and velocity signal, acceleration signal were got by piezoelectric acceleration transducer. Furthermore, the DWTT test of the composite tube was simulated in LS-DYNA, and proved the validity of the model by comparing the simulation results with the experiment results. We established the vehicle front longitudinal beam model with the material type of the composite tube, and carried out the simulations of whole car collisions in LS-DYNA according to FMVSS 208. Through the analysis of occupant head injury got from the simulations, we got the result that using the composite tube material could not only elevate the cars safety but also reduce front longitudinal beam weight effectively.

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.

scholarly journals Study on Combined Energy Absorption Support for Rockburst Disaster Control in Tunnelling

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Liang Kuang ◽  
Gang Wang ◽  
Wenge Qiu ◽  
Lun Gong ◽  
Zhiqiang Feng ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Absorption ◽  
Control Mechanism ◽  
Impact Force ◽  
Steel Tube ◽  
Steel Pipes ◽  
Loading Tests ◽  
Energy Absorbing ◽  
Disaster Control ◽  
The Impact

In order to better realize the rockburst disaster control mechanism and approach, the rockburst response of concrete blocks with different energy absorption levels under different energy storage conditions was observed and analyzed by loading tests. The occurrence and control mechanism of rockburst were explored from the perspective of energy aggregation and energy dissipation. On this basis, a combined energy absorption support system of concrete-filled steel tube frames and hollow steel pipes for rockburst disaster control was designed, and the effectiveness of the system was verified by numerical simulation and field tests. The results of loading tests show that the failure mode of the specimens changes from static failure to dynamic burst under energy storage loading. The occurrence of rockburst is inevitable when the energy supply is sufficient, but the disaster can be reduced or eliminated by strengthening constraints and improving energy-absorbing capacity to transform rockburst into large deformation. The combined structure consists of the hollow steel pipes being energy-absorbing part and the concrete-filled steel tube frames being strong confinement part was proposed to control rockburst disaster in tunnel support. The numerical analysis on the dynamic response of the support under strong rockburst impact shows that the hollow steel pipes effectively reduced the impact force on the concrete-filled tube frames, and accordingly, the deformation of the entire support system decreased. Given the condition that the hollow steel pipes be able to absorb all the impact energy during deformation, the smaller the strength of the hollow steel pipe is, the smaller the impact force and the displacement is. The combined energy absorption support provides an effective solution for rockburst disaster management in tunnels with strict clearance requirements.

Experimental behaviour of hollow reinforced concrete members with inner octagonal steel tube under lateral impact

2019 ◽  
Vol 22 (15) ◽  
pp. 3328-3340
Author(s):  
Hui Zhao ◽  
Rui Wang ◽  
Chuanchuan Hou ◽  
Dongjie Zhang
Keyword(s):  
Reinforced Concrete ◽  
Load Ratio ◽  
Steel Tube ◽  
Lateral Impact ◽  
Low Velocity ◽  
Impact Performance ◽  
Failure Patterns ◽  
Concrete Members ◽  
Axial Load Ratio ◽  
The Impact

This work investigated the impact performance of hollow reinforced concrete members with inner octagonal steel tube. Experiments on 13 specimens subjected to low-velocity drop weight impact are presented in this article, covering key parameters such as the impact height, boundary condition, axial load ratio and thickness of the inner tube. The dynamic processes, failure patterns, impact force and mid-span deflection histories, and residual mid-span deflections were obtained from the experiments. Flexure-shear was observed as the main failure pattern for all the specimens under impact. It was found that all the key parameters considered had influences on the impact performance of hollow reinforced concrete specimens with inner octagonal steel tube. Effects of these parameters on the impact performance of hollow reinforced concrete members were discussed.

Experimental Study on the Lateral Compression and Energy Absorption Characteristic of Steel Tube Filled with Polyurethane Foam

2014 ◽  
Vol 624 ◽  
pp. 13-19
Author(s):  
Zhao Peng Zhou ◽  
You Quan Qin ◽  
Fei Liu ◽  
Yan Mi Wang
Keyword(s):  
Energy Absorption ◽  
Polyurethane Foam ◽  
Deformation Mode ◽  
Absorption Efficiency ◽  
Steel Tube ◽  
Experimental Comparison ◽  
Absorption Characteristic ◽  
Lateral Compression ◽  
Energy Absorption Efficiency ◽  
The One

In order to enhance the lateral compression energy absorption capability of round steel tube without obviously increasing the mass of round steel tube, this paper has developed the polyurethane foam filled round steel tube and through experimental comparison, studied such parameters as the laterally-compressed platform loading, total absorbed energy and energy absorbed per unit mass for the filled tubes and empty tubes of three kinds of pipe diameter. The results show that the round steel tube filled with polyurethane foam can change the deformation mode of round steel tube and increase the energy absorption capability of steel tube substantially with very little increase of mass; the energy absorption efficiency is obviously higher than the one of empty steel tube.

Experimental Study of Low Velocity Impact Response of Carbon/Basalt Hybrid Filament Wound Composite Pipes

2018 ◽  
Vol 18 (07) ◽  
pp. 1850089 ◽  
Author(s):  
Naseer H. Farhood ◽  
Saravanan Karuppanan ◽  
Hamdan H. Ya ◽  
Mark Ovinis
Keyword(s):  
Energy Absorption ◽  
Impact Resistance ◽  
Basalt Fiber ◽  
Impact Response ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Absorption Mechanism ◽  
Damage Resistance ◽  
Composite Pipes ◽  
The Impact

In this study, the impact damage resistance of carbon/basalt hybrid fiber reinforced polymer pipes was experimentally investigated under low velocity impact loading. The composite pipes, composed of thin plastic liner of HDPE wrapped with eight layers of plies at constant winding angle of [[Formula: see text]55[Formula: see text]/90[Formula: see text]/[Formula: see text]55[Formula: see text]/90[Formula: see text]], were fabricated through filament winding technique. Eight pipe configurations with different stacking sequence and fiber content proportion were studied. Specimens cut from the original pipes were tested in a drop weight impact machine under two levels of impact energies, 50[Formula: see text]J and 100[Formula: see text]J, in order to predict the impact response and induced damage resistance of the pipe. The damage of the tested pipes was assessed based on the force-displacement, force-time histories, the energy absorption mechanism, as well as the micrographs captured by scanning electron microscope (SEM) for the specimens. The results indicate that the impact resistance behavior was highly affected by the stacking sequence of the layers and partly affected by the fiber content ratio. Positioning the basalt fiber on the impacted side enhances the energy absorption mechanism for both levels of imposed energies, while improving the impact resistance. The addition of 50% basalt fiber can slightly increase the impact resistance compared to the addition of 25% basalt fiber. However, specimens with 25% basalt fiber showed lower peak force, lower damage area and lower energy absorption.

Study on Concrete Filled Square Steel Tube under Lateral Impact Loading

2010 ◽  
Vol 163-167 ◽  
pp. 941-946
Author(s):  
Liang Zheng ◽  
Zhi Hua Chen
Keyword(s):  
Dynamic Response ◽  
Impact Force ◽  
Residual Deformation ◽  
Time History ◽  
Steel Tube ◽  
Lateral Impact ◽  
Deformation Stage ◽  
Elastic Rebound ◽  
Square Steel Tube ◽  
The Impact

Finite element models of both the concrete filled square steel tube and a Cuboid impactor were developed, incorporating ANSYS/LS-DYNA. Three stages of time history curve of the impact force of the concrete filled square steel tube including the impact stage, stable stalemate stage, the decaying stage were generalized according to its dynamic response. And with the wall thickness increased, the peak of the impact force and the platform value is also increase, with axial force increased, the peak impact force hardly changed, but the impact platform value have a certain extent lower. Then four stages of time history curve of the impact displacement were proposed according to the dynamic response of the impact of the concrete filled square steel tube based on numerical analysis, four stages include in elastic deformation stage, plastic deformation stage, elastic rebound stage, free vibration stage in the position of the residual deformation. Finally, time history curve of the impact force and displacement according to the dynamic response is analyzed under the impact of the corner of the concrete filled square steel tube, the results show that the anti-impact capability of 45 degree angle is higher than that of the front impact.

scholarly journals Enhancing the Energy Absorption Characteristics of Multi-Cell Square Tubes under Lateral Impact

2019 ◽  
Vol 8 (4) ◽  
pp. 4903-4907
Keyword(s):  
Energy Absorption ◽  
Light Weight ◽  
Lateral Impact ◽  
Plastic Buckling ◽  
Cylindrical Tubes ◽  
Thin Walled ◽  
Impact Kinetic Energy ◽  
Impact Simulations ◽  
The Impact ◽  
Tubular Components

Thin-walled tubular components have been broadly utilized in energy absorption applications, to improve the crashworthiness of the structure and to mitigate the impact kinetic energy through progressive plastic buckling. The extensive usage of cylindrical tubes as impact energy attenuators is owing to their superior crashworthiness behaviour, easy fabrication, less cost, and light-weight efficacy. The current paper examines the lateral impact behaviour of thin-walled aluminum multi-cell square tubes of different configurations using numerical simulations. These non-linear impact simulations were performed on multi-cell square tubes using finite element ABAQUS/CAE explicit code. From the overall results obtained, the crashworthiness performance of multi-cell square tubes of various configurations were compared. Moreover, multi-cell square tube of first type were recognized as most prominent for better energy absorption. This type of tubes was found to be effective one to improve the lateral crashworthiness performance

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