The Numerical Simulation of Horizontal Straightening for 60 kg/m Heavy Rail with Original Curvature

2009 ◽  
Vol 16-19 ◽  
pp. 44-48 ◽  
Author(s):  
Hua Song ◽  
Li Hua Fu ◽  
Pei Long Wang ◽  
De Xin Ding ◽  
Hui Li
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Dynamic Simulation ◽  
Reference Value ◽  
Fem Model ◽  
Simulation Process ◽  
Explicit Dynamics ◽  
Horizontal Roller ◽  
Heavy Rail

It has established the FEM model of nine horizontal roller straightening with original curvature for 60㎏/m heavy rail by using explicit dynamics software ANSYS/LS-DYNA in the paper, and it carried out the dynamic simulation process of the nine horizontal roller straightening, analyzed the stress changing rules of heavy rail in the seven deformation zones during the straightening process , even studied the value and distributive condition of residual stress after straightening, disclosed the mechanism of the residual stress in the heavy rail straightening process, and the paper is a guidance to improve heavy rail quality in straightening craft. It has the reference value to the design of heavy rail straightening machine and the formulation of the straightening regulations.

Study on the Optimization Straightening Regulation of Heavy Rail Compound Roll Straightening

2010 ◽  
Vol 102-104 ◽  
pp. 227-231 ◽  
Author(s):  
Hua Song ◽  
Pei Long Wang ◽  
Li Hua Fu ◽  
Ming Chen ◽  
Z.Q. Wang
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Experimental Method ◽  
Effective Factors ◽  
Explicit Dynamics ◽  
Effective Factor ◽  
Simulation Calculation ◽  
Heavy Rail

This paper adopted explicit dynamics FEM software ANSYS/LS-DYNA and carried out the numerical simulation calculation of 9 roller horizontal straightening and 8 roller vertical straightening for 60 kg/m heavy rail with original curvature. The reductions of straightening rollers are taken as the main effective factor to the residual stress in the straightening regulation. It adopted orthogonal experimental method to obtain the main effective factors for straightness and residual stress. In the assurance of meeting the straightness, it obtained the regulation in which the residual stress is the smallest, so it makes the important theoretical and actual sense to formulate the rational straightening process and improve the straightening quality of rail.

Numerical Analysis and Simulation of the Straightening Process of Heavy Rails on a Horizontal Roller-Straightening Machine

2019 ◽  
Vol 946 ◽  
pp. 775-781
Author(s):  
E.V. Timakov ◽  
F.S. Dubinskiy
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Hot Rolling ◽  
Input Data ◽  
Experimental Tests ◽  
Cooling Process ◽  
Horizontal Roller ◽  
Initial Camber ◽  
Heavy Rail

In this paper, the ABAQUS is adopted to carry on numerical simulation on straightening process of R65 heavy rail. The straightening process has been simulated here using the FE package of ABAQUS. All the input data were extracted from experimental tests according to tail manufacturing. Moreover, initial camber of the rail was measured after hot rolling and cooling process.

Research on the Straightening Deformation Process of the Residual Stress of the Numerical Simulation for Different Kinds of Heavy Rail

2012 ◽  
Vol 430-432 ◽  
pp. 492-496
Author(s):  
Yu Yan Liu ◽  
Hao Li ◽  
Lin Chen
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Finite Element ◽  
Deformation Process ◽  
Element Model ◽  
Regional Deformation ◽  
Distribution Rule ◽  
Deformation Area ◽  
The Finite Element Model ◽  
Heavy Rail

Through out the establishment of heavy rail entity model and the finite element model of straightening for different kinds of heavy rail after the residual stress in straightening investigated . Analysed U75V、U76CrRE、U71Mn and U75VM the four different kinds in 8+1 level straightening of the seven regional deformation area rail head, rail waist, rail base vertical stress distribution rule.

scholarly journals Straightening Regulation Optimization on the Residual Stress Induced by the Compound Roll Straightening in the Heavy Rail

2011 ◽  
Vol 18 (1-2) ◽  
pp. 171-180 ◽  
Author(s):  
Hua Song ◽  
Peilong Wang ◽  
Lihua Fu ◽  
Ming Chen ◽  
Zhongqiang Wang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Calculation Method ◽  
Residual Value ◽  
Optimal Regulation ◽  
Explicit Dynamics ◽  
Effective Factor ◽  
Heavy Rail

Residual stress is very important to the straightened quality of rail, this paper adopts explicit dynamics FEM to study on residual stress. We established compound roller model and calculated the residual value of heavy rail through 9 roller horizontal straightening and 8 roller vertical straightening. The reductions of straightening rollers are taken as the main effective factor to the residual stress in the straightening process. We adopt orthogonal calculation method to obtain the main effective factor to residual stress. On the base of assurance of the straightness, we obtained the optimal regulation in which the residual stress is the smallest, so the paper makes the important theoretical and actual sense to formulate the rational straightening regulation and improve the straightening quality of rail.

scholarly journals The Effect of Initial Cooling Temperature on Deformation of U75V Heavy Rail after Cooling

2011 ◽  
Vol 2-3 ◽  
pp. 667-672 ◽  
Author(s):  
Ming Xin Gao ◽  
Hao Jia ◽  
Juan Juan Jiang ◽  
Pei Long Wang ◽  
Hua Song ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
High Speed ◽  
Reference Value ◽  
Cooling Process ◽  
Technological Parameters ◽  
Stress Couple ◽  
Cooling Temperature ◽  
Section Size ◽  
Couple Method ◽  
Heavy Rail

The initial cooling temperature has important effect on the bending change and section size of rolled heavy rail, when rolled heavy rail is on the cooling bed for natural cooling. In the paper, the heat-stress couple method is adopted to carry on numerical simulation to cooling process of 60kg/m U75V heavy rail, and we has obtained the bending change value and section size of rolled heavy rail in different initial cooling temperature. The study is of great reference value on the design of cooling bed which is for hundred-meter high speed heavy rail and the formulation of cooling technological parameters.

Study on One Kind of Antenna Radomes Materials Numerical Algorithm Simulation Based on DBEM

2008 ◽  
Vol 575-578 ◽  
pp. 1471-1476
Author(s):  
Ying Wu Fang ◽  
Yi Wang
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Boundary Element Method ◽  
Dynamic Simulation ◽  
Reference Value ◽  
Simulation Algorithm ◽  
Simulation Accuracy ◽  
Dynamic Behaviors ◽  
Simulation Based ◽  
Numerical Modeling And Simulation

An approach of numerical modeling and simulation algorithm is presented to predict dynamic behaviors of one kind of antenna radomes materials efficiently. Considering the dynamic behaviors in the lateral and interior of the antenna radomes materials, the dynamic simulation equations of the antenna radomes materials is established based on a dynamic boundary element method (DBEM) by using the domain reducing to decrease computational scale and costs of the equations greatly, and the dynamic behaviors of the antenna radomes materials can be gotten effectively. Numerical simulation calculating and experiments show that the presented method not only saves computational efforts, raises analytical efficiency and simulation accuracy but also can provide the theoretical bases for avoiding the weak pose of the antenna radomes materials. It has very important reference value for improving theoretical calculation and design level of the antenna radomes materials.

The FEM Dynamic Simulation in the Drilling Process with Indexable Inserts

2012 ◽  
Vol 557-559 ◽  
pp. 1292-1297
Author(s):  
Lan Lan Liu ◽  
Li Ping Zhou ◽  
Zheng Jian Ying
Keyword(s):  
Numerical Simulation ◽  
Cutting Force ◽  
Dynamic Simulation ◽  
Equivalent Stress ◽  
Radial Force ◽  
Drilling Process ◽  
Simulation Technology ◽  
Fem Model ◽  
Deform 3D

This paper is based on the platform of the FEM software deform-3D, using numerical simulation technology, the FEM model of drilling No.45 steel is established; the equivalent stress and temperature of the workpiece through the dynamic simulation of the drilling process with indexable inserts can be obtained. Moreover, the cutting force, radial force of carbide and torque suffered by the two blades during the drilling process was analyzed and forecasted. What else, the wear of the blade was evaluated.

Numerical Simulation of the Effects of Preheating on Electron Beam Additive Manufactured Ti-6Al-4V Build Plate

2016 ◽  
Vol 879 ◽  
pp. 274-278 ◽  
Author(s):  
Jun Cao ◽  
Philip Nash
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Finite Element ◽  
Electron Beam ◽  
Cross Section ◽  
Element Model ◽  
Normal Direction ◽  
Thermal Residual Stresses ◽  
Longitudinal Residual Stress ◽  
Middle Cross Section

In an earlier study, a 3-D thermomechanical coupled finite element model was built and experimentally validated to investigate the evolution of the thermal residual stresses and distortions in electron beam additive manufactured Ti-6Al-4V build plates. In this study, an investigation using this robust and accurate model was focused on an efficient preheating method, in which the electron beam quickly scanned across the substrate to preheat the build plate prior to the deposition. Various preheat times, beam powers, scan rates, scanning paths and cooling times (between the end of current preheat scan/deposition layer and the beginning of the next preheat scan/deposition layer) were examined, and the maximum distortion along the centerline of the substrate and the maximum longitudinal residual stress along the normal direction on the middle cross-section of the build plate were quantitatively compared. The results show that increasing preheat times and beam powers could effectively reduce both distortion and residual stress for multiple layers/passes components.

Finite Element Analyses of Residual Stresses in Typical Welded Joints Used in Nuclear Power Plants and Comparisons With Experiments

2010 ◽  
Author(s):  
Dean Deng ◽  
Kazuo Ogawa ◽  
Nobuyoshi Yanagida ◽  
Koichi Saito
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Residual Stresses ◽  
Welded Joints ◽  
Nuclear Power ◽  
Power Plants ◽  
Butt Joint ◽  
Welding Residual Stress ◽  
Dissimilar Metal ◽  
Water Reactors

Recent discoveries of stress corrosion cracking (SCC) at nickel-based metals in pressurized water reactors (PWRs) and boiling water reactors (BWRs) have raised concerns about safety and integrity of plant components. It has been recognized that welding residual stress is an important factor causing the issue of SCC in a weldment. In this study, both numerical simulation technology and experimental method were employed to investigate the characteristics of welding residual stress distribution in several typical welded joints, which are used in nuclear power plants. These joints include a thick plate butt-welded Alloy 600 joint, a dissimilar metal J-groove set-in joint and a dissimilar metal girth-butt joint. First of all, numerical simulation technology was used to predict welding residual stresses in these three joints, and the influence of heat source model on welding residual stress was examined. Meanwhile, the influence of other thermal processes such as cladding, buttering and heat treatment on the final residual stresses in the dissimilar metal girth-butt joint was also clarified. Secondly, we also measured the residual stresses in three corresponding mock-ups. Finally, the comparisons of the simulation results and the measured data have shed light on how to effectively simulate welding residual stress in these typical joints.

Numerical Simulation of Riveting Process

2010 ◽  
Vol 34-35 ◽  
pp. 641-645
Author(s):  
Hong Shuang Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Process Parameters ◽  
Static Method ◽  
Riveting Process ◽  
Relationship Of ◽  
The Relationship ◽  
Element Method

In order to fully understanding the distribution of residual stress after riveting and the relationship between residual stress and riveting process parameters during riveting, Finite Element Method was used to establish a riveting model. Quasi-static method to solve the convergence difficulties was adopted in riveting process. The riveting process was divided into six stages according to the stress versus time curves. The relationship of residual stress with rivet length and rivet hole clearance were established. The results show numerical simulation is effective for riveting process and can make a construction for the practical riveting.

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