scholarly journals Influence of Material Properties on Automobile Energy-Absorbing Components Crashworthiness

2014 ◽  
Vol 8 (1) ◽  
pp. 113-116
Author(s):  
Liuyan Jie ◽  
Ding Lin
Keyword(s):  
Finite Element ◽  
Numerical Simulations ◽  
Material Properties ◽  
Simulation Analysis ◽  
Fe Method ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Energy Absorbing

In the present work, the simulation analysis of automobile energy-absorbing components was carried out using Finite Element (FE) method. The numerical simulations were carried out using the software LS-DYNA. Automobile energy-absorbing components usually were made of a metal thin walled tube. In the paper, several types of material properties were studied and compared. Results show that the material properties have influence to automobile energy - absorbing components crashworthiness.

Finite Element Analysis and Shape Optimization of Aluminum Alloy Automobile Energy-Absorbing Components

2012 ◽  
Vol 249-250 ◽  
pp. 954-957
Author(s):  
Yan Jie Liu ◽  
Lin Ding ◽  
Qing Fen Li ◽  
Dan Wang
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Cross Section ◽  
Simulation Analysis ◽  
Fe Model ◽  
Fe Method ◽  
Element Analysis ◽  
Section Shape ◽  
Thin Walled Tube ◽  
Energy Absorbing

In the present work, the structure optimum design and simulation analysis of aluminum alloy automobile energy-absorbing components was carried out by using Finite Element (FE) method. The numerical simulations were carried out using the software LS-DYNA. Automobile energy-absorbing components usually was made a mental thin walled tube. In the paper, the tube was adopted aluminum alloy material. The FE model of the tube was validated by comparing the theoretical results and FE model results. The good correlation of results obtained show that the numerical analyses are reliable. Attention was focused upon finding an optimum cross- section shape of the tube in order to improve the crashworthiness. Several types of cross- section were studied and compared. Results show that the crashworthiness of the tube improved obviously when square cross section with the grooves was adopted.

Effect of Ramp Angle on the Anti-Loosening Ability of Wedge Self-Locking Nuts Under Vibration

2018 ◽  
Vol 140 (7) ◽  
Author(s):  
Jianhua Liu ◽  
Hao Gong ◽  
Xiaoyu Ding
Keyword(s):  
Finite Element ◽  
Numerical Simulations ◽  
Production Technology ◽  
Material Properties ◽  
Threshold Value ◽  
Commercial Production ◽  
Experimental Results ◽  
Fe Method ◽  
Transversal Vibration

Recently, the wedge self-locking nut, a special anti-loosening product, is receiving more attention because of its excellent reliability in preventing loosening failure under vibration conditions. The key characteristic of a wedge self-locking nut is the special wedge ramp at the root of the thread. In this work, the effect of ramp angle on the anti-loosening ability of wedge self-locking nuts was studied systematically based on numerical simulations and experiments. Wedge self-locking nuts with nine ramp angles (10 deg, 15 deg, 20 deg, 25 deg, 30 deg, 35 deg, 40 deg, 45 deg, and 50 deg) were modeled using a finite element (FE) method, and manufactured using commercial production technology. Their anti-loosening abilities under transversal vibration conditions were analyzed based on numerical and experimental results. It was found that there is a threshold value of the initial preload below which the wedge self-locking nuts would lose their anti-loosening ability. This threshold value of initial preload was then proposed for use as a criterion to evaluate the anti-loosening ability of wedge self-locking nuts quantitatively and to determine the optimal ramp angle. Based on this criterion, it was demonstrated, numerically and experimentally, that a 30 deg wedge ramp resulted in the best anti-loosening ability among nine ramp angles studied. The significance of this study is that it provides an effective method to evaluate the anti-loosening ability of wedge self-locking nuts quantitatively, and determined the optimal ramp angle in terms of anti-loosening ability. The proposed method can also be used to optimize other parameters, such as the material properties and other dimensions, to guarantee the best anti-loosening ability of wedge self-locking nuts.

scholarly journals Axial Impact Crushing Performance of Bi-tubular Structures with Stiffeners

2019 ◽  
Vol 9 (1) ◽  
pp. 3742-3746
Keyword(s):  
Finite Element ◽  
Tubular Structure ◽  
Tubular Structures ◽  
Simple Geometry ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Impact Crushing ◽  
Energy Absorbing ◽  
Impact Simulations ◽  
Absorbing Elements

Thin-walled tube shaped components have been expansively utilized as an impact energy dissipating devices in modern vehicles in order to decrease fatalities and vehicle damage during accidents. The present article investigates the axial crushing performance of bi-tubular structures of various configurations. Nonlinear impact simulations were performed on the proposed bi-tubular structure using finite element ABAQUS/CAE explicit code. From the outcomes attained, the Energy Absorption Capability (EAC) of bi-tubular structures with stiffeners were compared and it confirmed that bi-tubular structures have more potential than that of traditional simple geometry tubes. Furthermore, bi-tubular structure of circle section enclosed with square type section were recommended as significant one for superior EAC. This kind of bi-tubular structures was found to be proficient energy absorbing elements in vehicles to improve the crashworthiness performance

Computational Modeling and Energy Absorption Behavior of Thin-Walled Tubes with the Kresling Origami Pattern

2021 ◽  
Vol 62 (2) ◽  
pp. 71-81
Author(s):  
Jiaqiang Li ◽  
Yao Chen ◽  
Xiaodong Feng ◽  
Jian Feng ◽  
Pooya Sareh
Keyword(s):  
Energy Absorption ◽  
Material Properties ◽  
Rotation Angle ◽  
Programming Model ◽  
Mixed Integer ◽  
Element Analysis ◽  
Cross Sectional ◽  
Thin Walled Tube ◽  
Absorption Performance ◽  
Thin Walled

Origami structures have been widely used in various engineering fields due to their desirable properties such as geometric transformability and high specific energy absorption. Based on the Kresling origami pattern, this study proposes a type of thin-walled origami tube the structural configuration of which is found by a mixed-integer linear programming model. Using finite element analysis, a reasonable configuration of a thin-walled tube with the Kresling pattern is firstly analyzed. Then, the influences of different material properties, the rotation angle of the upper and lower sections of the tube unit, and cross-sectional shapes on the energy absorption behavior of the thin-walled tubes under axial compression are evaluated. The results show that the symmetric thin-walled tube with the Kresling pattern is a reasonable choice for energy absorption purposes. Compared with thin-walled prismatic tubes, the thin-walled tube with the Kresling pattern substantially reduces the initial peak force and the average crushing force, without significantly reducing its energy absorption capacity; moreover, it enters the plastic energy dissipation stage ahead of time, giving it a superior energy absorption performance. Besides, the material properties, rotation angle, and cross-sectional shape have considerable influences on its energy absorption performance. The results provide a basis for the application of the Kresling origami pattern in the design of thin-walled energy-absorbingstructures.

Analysis of the crashworthiness design and collision dynamics of a subway train

2019 ◽  
Vol 234 (10) ◽  
pp. 1117-1128
Author(s):  
Suchao Xie ◽  
Xuanjin Du ◽  
Hui Zhou ◽  
Da Wang ◽  
Zhejun Feng
Keyword(s):  
Finite Element ◽  
Energy Absorption ◽  
Mechanical Performance ◽  
Simulation Analysis ◽  
Element Model ◽  
Collision Dynamics ◽  
Element Analysis ◽  
Static Compression ◽  
Subway Train ◽  
Energy Absorbing

In this study, the crashworthiness of a subway train was assessed by establishing a finite element model for the first three carriages of the train and the track using the Hypermesh software. By utilising the *MAT_HONEYCOMB material model, a honeycomb in an anti-climbing energy-absorbing device was simulated. Moreover, the process of a subway train – travelling at a speed of 25 km/h – colliding with another identical train in a stationary and non-braking state was simulated by employing the finite element analysis software Hypermesh and LS-DYNA. The process of simulation analysis was divided into two parts: (1) analysis of the anti-climbing energy-absorbing devices under static compression for the investigation of energy absorption and (2) collision analysis of the whole train. The contributions of the proposed energy-absorbing structure – at the end of driver’s cab, the coupler and draft gears on each section – to the overall energy absorption in a train collision were calculated. Furthermore, based on the EN15227 standard, the crashworthiness of the train with respect to the survival space for occupants, train acceleration and uplift of wheels relative to the track was evaluated. The coupler of the first carriage fails in a collision at 25 km/h, and the coupler and draft gear are the main energy-absorbing devices. *MAT_HONEYCOMB was used to define the honeycomb materials in anti-climbing energy-absorbing devices and could simulate the mechanical performance thereof. The crashworthiness of the train meets the relevant standard requirements.

Three-Dimensional Finite Element Simulation Analysis of Cutting Force of SiCp/Al Composite Thin-Walled Parts

2013 ◽  
Vol 589-590 ◽  
pp. 106-110 ◽  
Author(s):  
Yu Nan Liu ◽  
Shu Tao Huang ◽  
Li Zhou ◽  
Li Fu Xu
Keyword(s):  
Finite Element ◽  
Cutting Force ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Depth Of Cut ◽  
Milling Force ◽  
Machining Deformation ◽  
Al Composite ◽  
Radial Depth ◽  
Thin Walled

In milling process, cutting force is the main cause of machining deformation, and in machining of thin-walled parts, machining deformation is the major factor for machining error. In this paper, through finite element analysis software ABAQUS, three-dimensional simulation analysis on the machining of SiCp/Al composite thin-walled parts with a polycrystalline diamond tool have been carried out. It reveals the influence of radial depth of cut, cutting speed, and feed per tooth on cutting force. Analysis results show that: higher speed, small radial depth of cut and moderate feed per tooth can effectively reduce cutting force and inhibit deformation. In addition, a comparison is made between analysis results of milling force and high accuracy milling force prediction model, results from the two methods are similar.

Study on Factors of Axial Crushing of Thin-Walled High-Strength Steel Sections Used in Passenger Car

2014 ◽  
Vol 989-994 ◽  
pp. 898-902
Author(s):  
Gui Fan Zhao ◽  
Yao Wei Hu ◽  
Xiao Cheng ◽  
Ke Xiao
Keyword(s):  
Finite Element ◽  
High Strength Steel ◽  
Spot Welding ◽  
High Strength ◽  
Element Model ◽  
Welding Seam ◽  
Seam Welding ◽  
Thin Walled Tube ◽  
Steel Sections ◽  
Thin Walled

This paper firstly studied the structure of front longitudinal, then reviewing comprehensive literature draw the similarity of collision of the thin-walled tube and front longitudinal,finally ensure the study of collision of the thin-walled tube. And establishing three kinds of thin-walled welded rectangular beam finite element model of spot welding, seam welding and laser welding, arrive a more superior technology through researching and analyzing the model.

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