A Finite Element Cavitation Algorithm: Application/Validation

1991 ◽  
Vol 113 (2) ◽  
pp. 255-260 ◽  
Author(s):  
A. Kumar ◽  
J. F. Booker
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Hydrodynamic Lubrication ◽  
Simulation Algorithm ◽  
Finite Element Implementation ◽  
Previous Experimental Data ◽  
Simulation Results ◽  
Present Simulation

A mass-conserving simulation algorithm for cavitating hydrodynamic lubrication has been described elsewhere. The algorithm, which is particularly well adapted to finite element implementation, is outlined qualitatively and demonstrated quantitatively through bearing applications studied experimentally by others. Present simulation results and previous experimental data agree relatively closely for these applications, providing limited validations of the algorithm and suggesting new lines of investigation.

scholarly journals Investigation of the Thickness Differential on the Formability of Aluminum Tailor Welded Blanks

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 875
Author(s):  
Jie Wu ◽  
Yuri Hovanski ◽  
Michael Miles
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Numerical Model ◽  
Plastic Strain ◽  
Finite Element Model ◽  
Equivalent Plastic Strain ◽  
Element Model ◽  
Dome Height ◽  
Tailor Welded Blanks ◽  
Simulation Results

A finite element model is proposed to investigate the effect of thickness differential on Limiting Dome Height (LDH) testing of aluminum tailor-welded blanks. The numerical model is validated via comparison of the equivalent plastic strain and displacement distribution between the simulation results and the experimental data. The normalized equivalent plastic strain and normalized LDH values are proposed as a means of quantifying the influence of thickness differential for a variety of different ratios. Increasing thickness differential was found to decrease the normalized equivalent plastic strain and normalized LDH values, this providing an evaluation of blank formability.

The Finite Element Analysis of New Forged Coupler Knuckle

2013 ◽  
Vol 367 ◽  
pp. 122-125
Author(s):  
Guang Xin Wang ◽  
Xiang Shun Bu ◽  
Lin Jie Li ◽  
Li Li Zhu
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Direct Relationship ◽  
Element Analysis ◽  
Compression Load ◽  
The Finite Element Analysis ◽  
Simulation Results ◽  
Element Technique ◽  
Working Situation ◽  
Made In

As one of the most important load-bearing parts, coupler knuckle has a direct relationship with the safety in operation and reliability of the freight trains. A new forged coupler knuckle is made in order to meet the challenge to export ore train to Australia. Using the finite element technique, the stress characteristics of forged coupler knuckle under 1225kN load in tension and 1500kN compression load are evaluated. Simplify the load and boundary condition depend on the real working situation, the numerical simulation results coincide with experimental data.

Distortion Simulation of Unsymmetrical Composite Laminates Using the Finite Element Analysis Method

2007 ◽  
Vol 546-549 ◽  
pp. 1563-1566
Author(s):  
Min Li ◽  
Bao Yan Zhang ◽  
Xiang Bao Chen
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Laminates ◽  
Shell Element ◽  
Element Analysis ◽  
Unsymmetric Laminates ◽  
The Finite Element Analysis ◽  
Simulation Results ◽  
The Difference

Unsymmetric composite laminates were benefit to reducing the structure weight of some aircrafts. However, the cured unsymmetric laminates showed distortion at room temperature. Therefore, predicting the deformation before using the unsymmetrical composite is very important. In this study an attempt was made to predict the shapes of some unsymmetric cross-ply laminates using the finite element analysis (FEA). The bilinear shell-element was adopted in the process. Then the simulation results were compared with the experimental data. The studies we had performed showed that the theoretical calculation agreed well with the experimental results, the predicted shapes were similar to the real laminates, and the difference between the calculated maximum deflections and the experimental data were less than 5%. Hence the FEA method was suitable for predicting the warpage of unsymmetric laminates. The error analysis showed that the simulation results were very sensitive to the lamina thickness, 2 α and (T.

Variable Thickness Rolling - A New Process for Rolled Profile Strips

2018 ◽  
Vol 792 ◽  
pp. 47-52
Author(s):  
Xiao Gong Wang ◽  
Xiang Hua Liu
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Cross Sections ◽  
Variable Thickness ◽  
Industrial Development ◽  
Element Model ◽  
Light Weight ◽  
New Process ◽  
Roll System ◽  
Simulation Results

As a result of more requirements for improving natural environment and economic environment, the manufacturing of light weight components is becoming increasingly vital in industrial development. Variable thickness rolling (VTR)-a new process for rolled profile strips (RPS) is proposed in this paper. This so-called “variable thickness rolling” is based on the utilization of a special roll system that causes the material to flow in latitudinal direction. The rolled profile strips with defined cross-sections are obtained by this process. The elastic-plastic finite element model is established to analyze the forming principle. The simulation results agree with experimental data on the whole.

scholarly journals Numerical Simulation and Experimental Study on the Drilling Process of 7075-t6 Aerospace Aluminum Alloy

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 553
Author(s):  
Haitao Luo ◽  
Jia Fu ◽  
Tingke Wu ◽  
Ning Chen ◽  
Huadong Li
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Axial Force ◽  
Element Model ◽  
Drilling Process ◽  
Feed Speed ◽  
Rotating Speed ◽  
Simulation Results

A finite element model for setting drilling conditions is established. The effect of feed speed and spindle speed on the drilling process was studied. In the test phase, drilling tests were conducted using three different feed speeds (60, 100, and 140 mm/min) and three different spindle speeds (800, 1000, and 1200 rpm). The correctness of the finite element model was verified by comparing the experimental and numerical simulation data. The results show that the axial force and torque increase significantly with the increase of feed speed, while the axial force and torque increase less as the spindle speed increases. The numerical simulation results show that the temperature of the cutting edge increases as the feed speed increases. Increasing the rotating speed increases the formation of chip curl. When the working conditions are high rotating speed and low feed, the tool wear is reduced, and the machining quality is better. The numerical simulation results obtained for the chip forming effect are similar to the experimental data. In addition, the simulation results show the generation of burrs. A comparison of the finite element simulation and experimental data leads to an in-depth understanding of the drilling process and ability to optimize subsequent drilling parameters, which provide reliable process parameters and technical guarantees for the successful implementation of drilling technology for space suspended ball structures.

scholarly journals Head injury of Vietnamese pedestrian in crash accident with SUV using numerical simulation

2021 ◽  
Vol 3 (SI2) ◽  
pp. first
Author(s):  
Lý Hùng Anh ◽  
Dinh Bao Nguyen ◽  
Anh Huy Nguyen
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Automobile Industry ◽  
Head Injuries ◽  
Crash Test ◽  
Crash Simulation ◽  
Standard Criterion ◽  
Hybrid Iii ◽  
The Usa ◽  
Simulation Results

Crash test simulation using finite-element method is more and more popular in the automobile industry because of its feasibility and cost saving. The majority of finite element dummy models used in crash simulation are built based on anthropometrical and biomechanical data of the USA and European bodies. Thus, it is necessary to develop a scaling algorithm to scale a reference dummy size into a desired one without rebuilding the entire model. In this paper, the Hybrid III dummy model provided by LS-DYNA software is scaled to suit Vietnamese biomechanical characteristics. Then a standard criterion for head injuries called HIC is introduced. In addition, the Hybrid III dummy model is validated by comparing experimental data with simulation results obtained from computer model.

Numerical Simulations on the Aerodynamics Drag of a Tractor With a Tandem-Trailer

2006 ◽  
Author(s):  
M. Sitlani ◽  
K. Aung
Keyword(s):  
Experimental Data ◽  
Aerodynamic Drag ◽  
Vehicle Speed ◽  
Gap Size ◽  
Heavy Duty ◽  
Heavy Duty Truck ◽  
Engine Design ◽  
Closing The Gaps ◽  
Simulation Results ◽  
Present Simulation

The aerodynamic drag characteristics of a heavy duty truck with two configurations, a tractor and a single trailer, and a tractor and a tandem-trailer (two trailers), have been studied. The aerodynamic drag of a truck depends on geometry, frontal area, and the speed of the truck. The basic geometry used in the simulation is 1:8 scale Ground Transportation System (GTS). The present simulation model has a simplified geometry of GTS with a cab-over engine design with either one or two trailers. In particular, the effects of the gap between the tractor and the trailer, and the gap between the tandem trailers on the aerodynamic drag were determined. The effects of vehicle geometry, vehicle speed, and the gap size were investigated and the drag coefficients were computed. CFD software STAR-CD with an expert tool, es-aero, was used for all the analyses reported in this paper. The simulation results were validated with available experimental data and good agreements were found for vehicle speeds at highway and city limits. The results showed that closing the gaps and incorporating boat-tails at the rear of the trailer could reduce the drag by as much as 40 percent.

Simulation of Container Design for Powder Metallurgy Titanium Components through Hot-Isostatic-Pressing

2015 ◽  
Vol 817 ◽  
pp. 610-614 ◽  
Author(s):  
Rui Peng Guo ◽  
Lei Xu ◽  
Jie Wu ◽  
Zheng Guan Lu ◽  
Rui Yang
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Powder Metallurgy ◽  
Alloy Powder ◽  
Hot Isostatic Pressing ◽  
Fem Simulation ◽  
Isostatic Pressing ◽  
Finite Element Calculations ◽  
Near Net Shape ◽  
Simulation Results

Shima model and two different kinds of container designs were described. The final geometries of powder metallurgy (PM) preforms were predicted by using finite element method. Several PM Ti-6Al-4V parts were fabricated through a hot isostatic pressing route for comparison with the prediction from the modelling. FEM simulation can be used for shrinkage prediction of powder during HIPing process. The finite element calculations agreed well with the experimental data for shrinkage of the titanium alloy powder under HIPing. The simulation results is helpful to fabricate near-net-shape PM titanium parts.

Cavitation in Normal Separation of Square and Circular Plates

1995 ◽  
Vol 117 (3) ◽  
pp. 403-409 ◽  
Author(s):  
S. Boedo ◽  
J. F. Booker
Keyword(s):  
Finite Element ◽  
Design Process ◽  
Lubricant Film ◽  
Circular Plates ◽  
Mixture Density ◽  
Normal Separation ◽  
Simulation Results ◽  
Bearing Design ◽  
Present Simulation

The “negative squeeze” lubrication problem is investigated by means of a mass-conservating finite element cavitation algorithm (described elsewhere) within the context of a dimensionless study of lubricant film behavior between rigid, parallel separating surfaces. Appropriate mesh geometries which capture spatial and temporal mixture density history and satisfy JFO conditions on the cavitation interface are determined. Present simulation results agree qualitatively with previous experiments, supporting the validity of the algorithm and its utility in the bearing design process.

Combination of an Improved 3D Geometry and Coupled Eulerian-Lagrangian Formulation for Turning Simulation

2020 ◽  
Vol 994 ◽  
pp. 240-247
Author(s):  
Christos Dimopoulos ◽  
Nikolaos E. Karkalos ◽  
János Kundrák ◽  
Angelos P. Markopoulos
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Cutting Forces ◽  
Lagrangian Formulation ◽  
Force Distribution ◽  
Temperature Prediction ◽  
Element Analysis ◽  
3D Geometry ◽  
Simulation Results

This paper examines whether the Coupled Eulerian-Lagrangian formulation, combined with a thought-out 3D geometry, used recently in turning processes, can provide accurate simulation results. Oblique cutting cases were analyzed with the aid of commercial software for Finite Element analysis. An evaluation of the simulation results was performed by comparing the cutting forces and temperatures of the simulation with experimental turning results. Overall, simulation results with good correlation with experimental data were observed for cutting forces, including axial force distribution and temperature prediction, showing that this approach can be used in turning simulations, regardless of cutting conditions involved.

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