Optimization of Initial Blank Shape to Minimize Defects in an A Pillar Inner Panel Using Finite Element Method

2012 ◽  
Vol 538-541 ◽  
pp. 1045-1048
Author(s):  
L.M. Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Model ◽  
Material Flow ◽  
Numerical Results ◽  
Fe Method ◽  
The Real ◽  
Final Configuration ◽  
Stamping Process ◽  
Blank Shape

Wrinkling and cracking are two major problems of the automobile inner panel. In this study, the stamping process of an A pillar inner panel is studied with the finite element (FE) method, aimed at avoiding drawbacks due to wrinkling and cracking. The established numerical model is proved accurate by comparing the numerical final configuration to the real part. Then the material flow of the blank is analyzed. It is concluded that blocking of material flow is the main reason for those two pathologies. Thus, a gap design is suggested to minimize the concerned defects. According to the numerical results, after optimizing, the inner panel is free from formability problems.

Numerical Study of Hydrodynamic Forces on a Submarine Piggyback Pipeline Under Wave Action

2012 ◽  
Author(s):  
Xiaofei Cheng ◽  
Yongxue Wang ◽  
Bing Ren ◽  
Guoyu Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Model ◽  
Stokes Equations ◽  
Numerical Study ◽  
Hydrodynamic Forces ◽  
Wave Action ◽  
Numerical Results ◽  
Physical Model Test ◽  
Element Method

In the paper, a 2D numerical model is established to simulate the hydrodynamic forces on a submarine piggyback pipeline under regular wave action. The two-dimensional Reynolds-averaged Navier-Stokes equations with a κ-ω turbulence model closure are solved by using a three-step Taylor-Galerkin finite element method (FEM). A Computational Lagrangian-Eulerian Advection Remap Volume of Fluid (CLEAR-VOF) method is employed to simulate free surface problems, which is inherently compatible with unstructured meshes and finite element method. The numerical results of in-line force and lift (transverse) force on the piggyback pipeline for e/D = G/D = 0.25 and KC = 25.1 are compared with physical model test results, which are conducted in a marine environmental flume in the State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, China. It is indicated that the numerical results coincide with the experimental results and that the numerical model can be used to predict the hydrodynamic forces on the piggyback pipeline under wave action. Based on the numerical model, the surface pressure distribution and the motion of vortices around the piggyback pipeline for e/D = G/D = 0.25, KC = 25.1 are investigated, and a characteristic vortex pattern around the piggyback pipeline denoted “anti-phase-synchronized” pattern is recognized.

Simulation of Improper Construction Procedure and Crack Analysis

2012 ◽  
Vol 204-208 ◽  
pp. 3236-3239 ◽  
Author(s):  
Wen Xiong Huang ◽  
Li Ying Tan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Results ◽  
Construction Technology ◽  
The Finite Element Method ◽  
Crack Analysis ◽  
The Real ◽  
Construction Procedure ◽  
Technology Process ◽  
The Impact

Based on the real construction technology, process and environment of Yuquanxi Bridge, the finite element method was applied in the research to make sure the crack mechanism and find out the impact of improper construction procedure on cracks of Block No.0. By comparing the numerical results with actual cracks condition, the impact of improper construction procedure on cracks of Block No.0 is uncovered clearly and it proves that to master of correct construction procedures and methodology is of great importance in construction a bridge.

scholarly journals Thermomechanical Analysis of a Helical-Wedge Rolling Process for Producing Balls

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 862 ◽  
Author(s):  
Zbigniew Pater ◽  
Janusz Tomczak ◽  
Jarosław Bartnicki ◽  
Tomasz Bulzak
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Model ◽  
Rolling Process ◽  
Thermomechanical Analysis ◽  
Numerical Results ◽  
High Agreement ◽  
Qualitative And Quantitative ◽  
Experimental Findings ◽  
Very High

The paper presents a complete numerical model of a helical-wedge rolling process for producing balls. The model was designed in Finite Element Method (FEM)-based Forge NxT v.1.1 that enables the simulation of both forming and separating balls. A comparison of numerical results with experimental findings revealed a very high agreement in both qualitative and quantitative terms. The developed numerical model was used to investigate the effect of flange shape on the helical-wedge rolling process for producing balls with a diameter of 125 mm. Three types of flange tools were investigated, and the best results were obtained for a wedge-shaped flange.

Based on FE Method to Research Resistant Rutting Ability of Pavement Structure in Heilongjiang Province

2011 ◽  
Vol 128-129 ◽  
pp. 1349-1354 ◽  
Author(s):  
Peng Cao ◽  
De Cheng Feng ◽  
Ru Xin Jing
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Results ◽  
New Method ◽  
Heilongjiang Province ◽  
Fe Method ◽  
Moving Vehicle ◽  
User Subroutine ◽  
Vehicle Load ◽  
Rutting Behavior

Using visco-elastoplastic-plastic finite element method, the resistant ability to rutting occurring in Heilongjiang province express way has been analyzed. Base on the numerical results, it has been found that the location of rutting occurring mainly existed in middle course, So some modified measurement of middle course to enhance the resistant rutting ability has been proposed. At the same time, A new user Subroutine, which is named dload of ABAQUS, has been employed to simulate the moving vehicle load ,this article has proposed a new method to predict rutting behavior .

Physical statement of the problem for a numerical model of soil freezing and heaving taking into account heat and mass transfer

2021 ◽  
pp. 244-256
Author(s):  
Виктор Григорьевич Чеверев ◽  
Евгений Викторович Сафронов ◽  
Алексей Александрович Коротков ◽  
Александр Сергеевич Чернятин
Keyword(s):  
Finite Element Method ◽  
Mass Transfer ◽  
Finite Element ◽  
Numerical Model ◽  
Boundary Conditions ◽  
Heat And Mass Transfer ◽  
Soil Freezing ◽  
The Finite Element Method ◽  
Freezing Front ◽  
Element Method

Существуют два основных подхода решения задачи тепломассопереноса при численном моделировании промерзания грунтов: 1) решение методом конечных разностей с учетом граничных условий (границей, например, является фронт промерзания); 2) решение методом конечных элементов без учета границ модели. Оба подхода имеют существенные недостатки, что оставляет проблему решения задачи для численной модели промерзания грунтов острой и актуальной. В данной работе представлена физическая постановка промерзания, которая позволяет создать численную модель, базирующуюся на решении методом конечных элементов, но при этом отражающую ход фронта промерзания - то есть модель, в которой объединены оба подхода к решению задачи промерзания грунтов. Для подтверждения корректности модели был проделан ряд экспериментов по физическому моделированию промерзания модельного грунта и выполнен сравнительный анализ полученных экспериментальных данных и результатов расчетов на базе представленной численной модели с такими же граничными условиями, как в экспериментах. There are two basic approaches to solving the problem of heat and mass transfer in the numerical modeling of soil freezing: 1) using the finite difference method taking into account boundary conditions (the boundary, for example, is the freezing front); 2) using the finite element method without consideration of model boundaries. Both approaches have significant drawbacks, which leaves the issue of solving the problem for the numerical model of soil freezing acute and up-to-date. This article provides the physical setting of freezing that allows us to create a numerical model based on the solution by the finite element method, but at the same time reflecting the route of the freezing front, i.e. the model that combines both approaches to solving the problem of soil freezing. In order to confirm the correctness of the model, a number of experiments on physical modeling of model soil freezing have been performed, and a comparative analysis of the experimental data obtained and the calculation results based on the provided numerical model with the same boundary conditions as in the experiments was performed.

A Numerical Analysis for Cracks Emanating from a Quarter-Spherical Cavity on the Edge of an Elastic Body

2012 ◽  
Vol 499 ◽  
pp. 243-247
Author(s):  
Long Hai Yan ◽  
Bao Liang Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Elastic Body ◽  
Spherical Cavity ◽  
Numerical Results ◽  
Shielding Effect ◽  
Corner Crack ◽  
Element Method

This note is specifically concerned with cracks emanating from a quarter-spherical cavity on the edge in an elastic body (see Fig.1) by using finite element method. The numerical results show that the existence of the cavity has a shielding effect of the corner crack. In addition, it is found that the effect of boundaries parallel to the crack on the SIFs is obvious when.H/R≤3

scholarly journals A 3D study of the contact surface developed by the contact between the tires and the structural pavements

Exacta ◽  
2009 ◽  
Vol 6 (2) ◽  
pp. 197-208
Author(s):  
Alex Alves Bandeira ◽  
Rita Moura Fortes ◽  
João Virgílio Merighi
Keyword(s):  
Finite Element ◽  
Contact Mechanics ◽  
Contact Area ◽  
Augmented Lagrangian Method ◽  
Numerical Results ◽  
Real Contact Area ◽  
The Real ◽  
Real Contact ◽  
Commercial Program ◽  
Contact Surfaces

The basic aim in this work is to present a new technique to analyze the contact surfaces developed by the contact between the tires and the structural pavements by numerical simulations, using 3D finite element formulations with contact mechanics. For this purpose, the Augmented Lagrangian method is used. This study is performed just putting the tires on the structural pavement. These tires and the structural pavement are discretized by finite elements under large 3D elastoplastic deformation. The real loads (of aircrafts, trucks or cars) are applied directly on each tire and by contact mechanics procedures, the real contact area between the tires and the pavement surface is computed. The penetration conditions and the contact interfaces are investigated in details. Furthermore, the pressure developed at the contact surfaces is automatically calculated and transferred to the structural pavement by contact mechanics techniques. The purpose of this work research is to show that the contact area is not circular and the finite element techniques can calculate automatically the real contact area, the real geometry and its stresses and strains. In the end of this work, numerical results in terms of geometry, stress and strain are presented and compared to show the ability of the algorithm. These numerical results are also compared with the numerical results obtained by the commercial program ANSYS.

The Semi-Discrete Finite Element Method for the Cauchy Equation

2014 ◽  
Vol 668-669 ◽  
pp. 1130-1133
Author(s):  
Lei Hou ◽  
Xian Yan Sun ◽  
Lin Qiu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Results ◽  
Cauchy Equation ◽  
The Time Domain ◽  
Nicolson Scheme ◽  
Discrete Finite Element ◽  
Better Than ◽  
Element Method ◽  
Crank Nicolson

In this paper, we employ semi-discrete finite element method to study the convergence of the Cauchy equation. The convergent order can reach. In numerical results, the space domain is discrete by Lagrange interpolation function with 9-point biquadrate element. The time domain is discrete by two difference schemes: Euler and Crank-Nicolson scheme. Numerical results show that the convergence of Crank-Nicolson scheme is better than that of Euler scheme.

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