Luggage Impact and Structure Optimization for Rear Seat Frame of Automobile

2016 ◽  
Vol 693 ◽  
pp. 155-162
Author(s):  
Zhi Ping Wang ◽  
Jin Ting Ni ◽  
Xin Zhang
Keyword(s):  
Finite Element ◽  
Structure Optimization ◽  
Rear Seat ◽  
Nonlinear Finite Element ◽  
The Other ◽  
Cad Model ◽  
Back Seat ◽  
Simulation Results ◽  
Seat Frame ◽  
Finite Element Methodology

It is essential that the back seat of a vehicle has to be designed safely and reliably and at the same time meet the ECE R17, as to reduce the back seat casualties in accidents caused by luggage impact. This paper studies a sample of back seat frame and establishes its precise CAD model. It adopts nonlinear finite element methodology to simulate the object under the ECE R17. The results reflect two problems. One is the force absorption and anti-deformation of the split seat frame is too weak; the other is the fixed connections linking the frame to the holder is not tight enough causing easy fall-off if being shocked. The test and simulation results suggest the following alterations, respectively to substitute the previous split seat frame for a one-piece seat frame as to improve the overall stiffness and anti-deformation, to adopt one-piece structure on the center support bracket and increases its thickness by 0.5mm, keep the remaining mounting bracket structure unchanged. The analyses of the improved program demonstrate its superior anti-deformation under the regulations.

Investigating the Effects of the Friction Coefficient and Tool Geometry on the Cup Thickness in the Deep Drawing Process of SPXI250 Alloy

2013 ◽  
Author(s):  
Iman Rostamsowlat ◽  
Ahmad Afsari ◽  
Maziar Janghorban
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Deep Drawing ◽  
The Other ◽  
Tool Geometry ◽  
Drawing Process ◽  
Nose Radius ◽  
Deep Drawing Process ◽  
Simulation Results ◽  
Thickness Variations

In this paper, effects of friction coefficient and tool geometry on the thickness variations of a cylindrical cup were studied. Blank is made of SPXI250 alloy sheet which was analyzed by Finite Element Method (FEM). This not been studied yet. Finite Element modeling of the deep drawing process was conducted using ABAQUS/EXPLICIT software. A set of appropriate die and punch were designed for experimental tests. The results of the simulation showed that a change in the friction coefficient of the die-blank interface leads to a significant changes in the cup thickness. Moreover, the results revealed that the influence of die nose radius on the final cup thickness variations is greater than that of the punch nose radius. The simulation results of this study were compared with the experimental results and those of the other investigators’. The comparisons of the experimental and simulation results with those of the other researchers were so satisfactory.

Research on the Numerical Simulation of Hot Stamping for High Strength Steel

2014 ◽  
Vol 898 ◽  
pp. 136-139
Author(s):  
Chang Feng Men ◽  
Wen Wen Du ◽  
Cui Hong Han
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
High Strength Steel ◽  
Hot Stamping ◽  
High Strength ◽  
Nonlinear Finite Element ◽  
Weight Percentage ◽  
Finite Element Software ◽  
Simulation Results ◽  
Die Temperature

In order to research on the hot stamping property of high strength steel, the stamping forming of USIBOR1500P is simulated by the nonlinear finite element software Dynaform and Ansys/ls-dyna. The initial data simulated on USIBOR1500P is obtained by the hot tensile test. The simulation results show that the martensite weight percentage and Vickers hardness are in inverse proportion to stamping speed and initial die temperature.

Numerical and Experimental Investigation of Bump Foil Forming Process for Foil Air Bearings

2011 ◽  
Vol 204-210 ◽  
pp. 2103-2108
Author(s):  
Wen Bo Duan ◽  
Hai Peng Geng ◽  
Bai Song Yang ◽  
Yan Hua Sun ◽  
Lie Yu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Deformable Body ◽  
Friction Model ◽  
Nonlinear Finite Element ◽  
Air Bearings ◽  
Forming Process ◽  
Rigid Plastic ◽  
Friction Forces ◽  
Simulation Results

In this paper, a simplified nonlinear finite element for bump foil forming process of foil air bearings is developed. The bump foil is dealt with as flexible deformable body, the upper die and lower die are considered as the rigid body without deformation. The friction model between bump foil and dies with velocity-dependent friction forces is described by arctan function. The forming process of SS304 Stainless Steel bump foil under different loads is investigated with rigid-plastic finite element method. The simulation results are compared with theoretical values and experimental results. Therefore more feasible process parameters are obtained to fabricate the bump foils.

scholarly journals Nonlocal vibration of carbon/boron-nitride nano-hetero-structure in thermal and magnetic fields by means of nonlinear finite element method

2020 ◽  
Vol 7 (5) ◽  
pp. 591-602 ◽  
Author(s):  
Hamid M Sedighi ◽  
Mohammad Malikan ◽  
Ali Valipour ◽  
Krzysztof Kamil Żur
Keyword(s):  
Finite Element ◽  
Boron Nitride ◽  
Dynamic Behavior ◽  
Thermal Environment ◽  
Boron Nitride Nanotubes ◽  
Nonlinear Finite Element ◽  
The Other ◽  
Beam Model ◽  
Nonlinear Frequency ◽  
Other Hand

Abstract Hybrid nanotubes composed of carbon and boron-nitride nanotubes have manifested as innovative building blocks to exploit the exceptional features of both structures simultaneously. On the other hand, by mixing with other types of materials, the fabrication of relatively large nanotubes would be feasible in the case of macroscale applications. In the current article, a nonlinear finite element formulation is employed to deal with the nonlocal vibrational behavior of carbon/boron-nitride nano-hetero-tubes in the presence of magneto-thermal environment. Euler–Bernoulli beam model in conjunction with the Eringen’s nonlocal theory of elasticity is adopted to derive the governing equation of motion. In order to conduct a nonlinear frequency analysis, the von-Kármán nonlinearity associated with moderate rotations is also considered. It is well known that temperature gradients can significantly change the dynamic behavior of nanotubes. On the other hand, the coefficients of thermal expansions of carbon and boron-nitride nanotubes are quite different that may affect the structural stability of hybrid nanotubes. Hence, to explore the vibration characteristic of such composite structures, the influence of magneto-thermal environment is also taken into account. Finally, the eigenvalue analysis is performed to exhibit the nonlinear mode shapes and natural frequencies of the system due to initial displacement. It is expected that the recognition of dynamic behavior of such hybrid nanotubes may open the doors to the creative design of next-generation nano-devices.

Numerical Simulation of Aircraft Ditching Based on ALE Method

2014 ◽  
Vol 668-669 ◽  
pp. 490-493 ◽  
Author(s):  
Wei Hu ◽  
Yong Hu Wang ◽  
Cai Hua Chen
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Vertical Velocity ◽  
Field Model ◽  
Aviation Safety ◽  
Nonlinear Finite Element ◽  
Accident Analysis ◽  
Finite Element Code ◽  
Fluid Field ◽  
Simulation Results

Aircraft Ditching is related primarily with the aviation safety. Firstly, the full-scaled shape of Boeing 777-200 is modeled according to the lost MH370 aircraft on 8th March. And then an Arbitrary Lagrange-Euler (ALE) fluid-field model is created for water and air domain. Next some simulation cases are implemented related to different vertical velocities using LS-DYNA nonlinear finite-element code, with the same horizontal velocity and attack angle. At the same time, the variations of the velocity of the head and tail are discussed. Consequently, Ditching overload peak occurs at the highest vertical velocity. The simulation results can deeply be applied to accident analysis of aircraft impacting on water.

Impact Study of Bend Tube on Bullet Initial Disturbance under the Action of Gravity

2014 ◽  
Vol 627 ◽  
pp. 69-73
Author(s):  
Guo Qing Liu ◽  
Cheng Xu ◽  
Xiao Yun Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Great Influence ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Initial Disturbance ◽  
Nonlinear Finite Element Method ◽  
Impact Study ◽  
Vertical Stiffness ◽  
Simulation Results

In order to study the influence of bend tube on firing accuracy due to gravity, a finite element model of sniper rifle, only considering the interaction between bullet and tube, was established based on nonlinear finite element method. The initial disturbance of bullet was taken as a measuring standard of firing accuracy. The model was used to simulate the launch process of sniper rifle under the condition of gravity static equilibrium in the method of the mixing calculation which had advantages of both dynamic explicit algorithm and static implicit algorithm. The simulation results show that vertical stiffness increases due to gravity and then the instantaneous velocity and attitude of bullet are largely influenced. Bending tube has a great influence on bullet motion.

Fully Coupled Floating Wind Turbine Simulator Based on Nonlinear Finite Element Method: Part II — Validation Results

2013 ◽  
Author(s):  
Timothée Perdrizet ◽  
Jean-Christophe Gilloteaux ◽  
David Teixeira ◽  
Gilles Ferrer ◽  
Loïc Piriou ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Wind Turbine ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Code Comparison ◽  
Floating Wind Turbine ◽  
Modeling Techniques ◽  
Simulation Results ◽  
Fully Coupled

The present paper describes the validation and the modeling capabilities of a new fully coupled floating wind turbine simulator based on DeepLines™ software. A first validation, based on code comparison with NREL-FAST software, is presented and shows very good correlation on a rigidly founded 5MW wind turbine in various wind conditions despite the different modeling techniques and assumptions of the two softwares. This benchmark, in addition to the extensive validation on various offshore projects, makes us confident on DeepLines capabilities to assess founded and floating wind turbine behaviour in a complex offshore environment. Furthermore, some simulation results on jacket and floating founded wind turbines, defined in the frame of IEA OC4 project, are presented and highlight the versatility of our simulator to perform offshore and floating wind turbine optimal design.

Novel Aerospace Architectures Made Possible by Forming Simulation

2013 ◽  
Vol 554-557 ◽  
pp. 1872-1878
Author(s):  
Joachim Zettler ◽  
Sjoerd van der Veen
Keyword(s):  
Finite Element ◽  
Finite Element Simulations ◽  
Virtual Manufacturing ◽  
The Other ◽  
Hot Forming ◽  
Design Phase ◽  
Early Design ◽  
Simulation Results ◽  
Explosive Forming ◽  
Early Design Phase

In the aerospace industry lightweight design in combination with fast and reliable manufacturing processes are key components to defend the leading position in the worldwide competition. In this frame it is an overall goal to reduce the number of process steps in order to produce parts for an aircraft to its minimum. Integral design is one way to cope with this goal but on the other hand raises a lot of problems that may occur in manufacturing or final assembly. To be able to predict potential bottlenecks or drawbacks in certain designs, finite element simulation can be helpful. Especially if it’s an early design phase and new material concepts are taking into account, the virtual manufacturing, done by finite element simulations is the only way to predict real life behavior. In this paper we will focus on the use and benefit of finite element simulations in the early design phase of very huge integral parts of a next generation aircraft. The parts do belong to the nose fuselage structure and will be manufactured from a 100-150mm thick AlMgSc plate. Two different manufacturing routes will be covered by simulation. 1. Hot forming the plates at around 300°C and machining 2. Explosive forming of the plates and machining For both routes, a complete simulation chain from forming over springback to final machining is developed and presented in detail. Special care is taken on a fully automated workflow from one step to the other to allow an easy adaptation to other part geometries in the future. To ensure a high quality of the simulation results all process steps of the hot forming route are simulated with ABAQUS implicit and approved constitutive laws. The explosive forming manufacturing route is simulated using an Eulerian-Lagrange approach taken into account the various possibilities of detonation loading. To validate the simulation results to real measurements, a scaled down version of one of the parts is manufactured in reality and each process step is compared with the simulation result.

Comparison of Stress Filed and Deformation of MAG and TIG for Cr13 Based on Finite Element

2015 ◽  
Vol 1095 ◽  
pp. 711-716
Author(s):  
Yun Xian Mao ◽  
Meng Qi Yang ◽  
Hai Rui Yue ◽  
Hui Yang ◽  
Z.G. Li ◽  
...  
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Dominant Role ◽  
Butt Joint ◽  
The Other ◽  
Analysis Software ◽  
Element Analysis ◽  
Welding Seam ◽  
The Finite Element Analysis ◽  
Simulation Results

This paper took flat butt joint based on Cr13 as a sample, in which TIG and MAG were adopted respectively, and analyzed qualitatively the simulation results of temperature field, stress field and deformation distribution by the finite element analysis software ANSYS. The simulating results indicate that residual transverse press stress plays a dominant role near the beginning and the end of the welding seam, that residual longitudinal pull stress is dominant in the other region of welding seam. The residual stress of MAG is higher than that of TIG. Nevertheless, the deformation of MAG is lower than that of TIG.

Stability Analysis of Grouting Strengthening in the Goaf Underlying a Canal

2012 ◽  
Vol 588-589 ◽  
pp. 1914-1917
Author(s):  
Wen Yan Lu ◽  
Xiao Xin Zhang ◽  
Wen Qian Li ◽  
Da Wei Tong ◽  
Xiao Ling Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Surface Movement ◽  
Strength Limit ◽  
Operation Conditions ◽  
Water Conveyance ◽  
Simulation Results ◽  
Safety Operation

In this paper an old mining goaf in Henan province is studied with the application of 3D nonlinear finite element method. The excavation and backfilling construction and water conveyance operation of the canal upper the old mining goaf is analyzed. Simulation results show that after the grouting strengthening, no layers exceed corresponding strength limit under both canal construction and operation conditions, meanwhile the surface movement and the size of the deformation are within the scope of the standard and won’t affect the construction and safety operation of the canal.

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