Numerical Simulation of Welding Distortion Using Shrinkage Force Approach and Application

2010 ◽  
Vol 129-131 ◽  
pp. 867-871 ◽  
Author(s):  
Yao Hui Lu ◽  
Ping Bo Wu ◽  
Jing Zeng ◽  
Xing Wen Wu
Keyword(s):  
Numerical Simulation ◽  
Welding Distortion ◽  
Railway Vehicle ◽  
Welding Deformation ◽  
Element Analysis ◽  
Force Method ◽  
The Finite Element Analysis ◽  
Numerical Simulation Methods ◽  
Shrinkage Force

The control of welding distortion during assembling process is very important. Using numerical simulation methods to obtain the welding distortion is an effective way to control the quality of welding. At first, taking the bead-on-plate welding as an example, the predictions of welding distortion were made using the shrinkage force method and the thermo-elastic-plastic method for comparison. It was concluded from the comparison that the simulation results by using the two methods are consistent. Therefore, the shrinkage force method can be applied to prediction of structural welding distortion in engineering. Based on the theory of welding shrinking force, welding deformation was predicted for the bogie side frame of railway vehicle. According to all the deformation results from the finite element analysis, the welding deformation of the bogie side frame was lager than the tolerance of quality and in reasonable agreement with the experimentally determined distortion values from literature. The work in this paper indicated that the shrinkage force method was effective to predict the welding deformation and to control the welding quality in large complex structures, such as the bogie frame of railway vehicle.

Study on FEM Numerical Simulation Method for the Welding Distortion

2011 ◽  
Vol 704-705 ◽  
pp. 1316-1321 ◽  
Author(s):  
Yao Hui Lu ◽  
Xing Wen Wu ◽  
Jing Zeng ◽  
Ping Bo Wu
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Welding Distortion ◽  
Railway Vehicle ◽  
Welding Deformation ◽  
Bogie Frame ◽  
Elastic Plastic ◽  
Side Beam ◽  
Element Method

The control of welding distortion during assembly process is very important. At present, there are mainly two numerical simulation methods for the welding distortion which are thermo-elastic-plastic finite element method and its simplified approach of inherent strains. At first, taking T-joint as an example, the welding distortions were computed using two methods mentioned above. Based on thermo-elastic-plastic finite element method, welding process was simulated by life and death element, moving heat source and transient state thermal field etc. Then, the welding distortion was calculated by inherent strains method after thermo-elastic-plastic computation. It was concluded from the comparison that the simulation results by using the two methods are consistent. Therefore, the inherent strains method can be conveniently and economically applied to prediction of structural welding distortion in engineering. Applied the inherent strains method, welding deformation was predicted for the bogie frame side beam of high speed train. According to the deformation results from the finite element analysis, the welding deformation of the bogie frame side beam was lager than the tolerance of quality and in reasonable agreement with the experimentally determined distortion values. The work in this paper indicated that the inherent strains method was effective to predict the welding deformation so as to control the welding quality in large complex structures, such as the bogie frame of railway vehicle. Key words: welding distortion; thermo-elastic-plastic method; inherent strains approach; numerical simulation; bogie frame;

Numerical Analysis of Masonry under Compression via Micro-Model

2011 ◽  
Vol 243-249 ◽  
pp. 1360-1365 ◽  
Author(s):  
Wei Rong Lü ◽  
Meng Wang ◽  
Xi Jun Liu
Keyword(s):  
Joint Strength ◽  
Ultimate Load ◽  
Poor Quality ◽  
Micro Model ◽  
Element Analysis ◽  
Mortar Joint ◽  
The Poor ◽  
The Finite Element Analysis ◽  
Brick And Mortar

The micro-model, which the brick and the mortar model are separated, is used to analyze masonry. Meanwhile, the mortar is divided into three layers along the thickness direction to obtain the internal mechanical behavior of mortar, and the vertical mortar joint strength is taken as 50% strength of the horizontal mortar joint for considering the poor quality of vertical mortar joint. The compressive ultimate load and failure mode of masonry taken from the finite element analysis result, especially the vertical cracks throughout all bricks and mortar and change of brick and mortar strain, are in agreement with the experimental results. It shows that the micro-model and method adopted in paper are able to effectively apply in nonlinear structural analysis for masonry.

The Analysis of Reinforcing the Bottom Chord around the Tapped Holes Based on the Thermosetting Resin Composite Materials

2012 ◽  
Vol 531 ◽  
pp. 609-612
Author(s):  
Xue Dong Han ◽  
Li Wei ◽  
Gang Luo ◽  
Li Ping Chang
Keyword(s):  
Composite Material ◽  
Resin Composite ◽  
Steel Bridge ◽  
Stress Distributions ◽  
Element Analysis ◽  
Steel Truss Bridge ◽  
The Finite Element Analysis ◽  
Before And After ◽  
Truss Bridge

The intensity of the joint in the bottom chord would affect the quality of the whole bridge because that the force of the bottom-through bridge is transferred mainly through the bottom chord, and the members of the truss connect each other by using the thread. In this paper, the bottom chord around the tapped holes is reinforced by composite material , and the stress on the bottom chord is analyzed before and after the reinforcement using the finite element analysis method, and the stress distributions in the directions of X,Y and Z on every layer of the composite material under the bilateral reinforcing condition are extracted and compared. The results show that: Reinforcing the bottom chord around the tapped holes using the composite material can change the stress level of the bottom chord effectively, helping to improve the quality of the construction of the steel bridge and the effect of the bilateral reinforcing is better than the unilateral reinforcing and providing certain reference for the security of the steel truss bridge

Deformation Analysis for Welding Assembly Processes of Automobile Panels

2010 ◽  
Vol 118-120 ◽  
pp. 70-74
Author(s):  
Yu Liu ◽  
Jian Xin Liu ◽  
Shu Yi Yan ◽  
Zhi Min Wang ◽  
Bing Zhang
Keyword(s):  
Numerical Simulation ◽  
Welding Process ◽  
Coupling Method ◽  
Welding Distortion ◽  
Deformation Analysis ◽  
Assembly Quality ◽  
Automobile Body ◽  
Dimensional Deviation ◽  
Assembly Deviation

Welding process of automobile panels is a key process in the manufacturing of automobile body and its quality directly impact on the appearance and quality of automobile. The causes of dimensional deviation of welded assembly could be workpieces variation, assembly tooling variation, and welding distortion. As a major source of assembly deviation, dimensional variations of workpieces have important effects on the assembly quality of automobile body. In this paper, pre-stressing was used to reflect the workpieces’ variation and the node coupling method was used in the numerical simulation to predict the deformation of assembly caused by the welding process of automobile panels. And further the computation results were listed and compared with the measured ones.

scholarly journals Mechanical Behavior and Damage of Zinc Coating for Hot Dip Galvanized Steel Sheet DP600

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 202
Author(s):  
Gui Li ◽  
Xiaoyu Long
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Steel Sheet ◽  
Steel Substrate ◽  
Zinc Coating ◽  
Indentation Test ◽  
Galvanized Steel ◽  
Element Analysis ◽  
The Finite Element Analysis

Advanced high strength galvanized steel sheet has been one of the dominant materials of modern automotive panels because of its outstanding mechanical properties and corrosion resistance. The zinc coating thickness of hot dip galvanized steel sheet is only about 10–20 μm, which is a discarded object on the macro level. However, it is obvious to damage and impact on stamping performance. Therefore, this paper takes zinc coating as the research object and builds its mechanical constitutive model based on a nano-indentation test and dimensional analysis theory. We separated the zinc coating from the galvanized steel substrate and constructed a sandwich material model by introducing a cohesive layer to connect the zinc coating and the steel substrate. We obtained the interface binding energy between the zinc coating and the steel substrate through the nano-scratch test. The accuracy of the model is verified by the finite element analysis of hemispherical parts. We used the five-layers element model with 0 thickness cohesive layer to simulate the zinc coating damage of galvanized steel sheet. The hemispherical part drawing experiment is used to verify the feasibility of the finite element analysis results. The results demonstrate that it is more accurate to consider the finite element numerical simulation of the zinc coating, introducing the cohesive element to simulate damage between the coating and the substrate. Drawing depth, stamping force, and the strain of the numerical simulation are closer to the experimental results.

The Finite Element Analysis on the Compression Splicing Position of Strain Clamp in Guy Tower

2014 ◽  
Vol 680 ◽  
pp. 249-253
Author(s):  
Zhang Qi Wang ◽  
Jun Li ◽  
Wen Gang Yang ◽  
Yong Feng Cheng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Model ◽  
Equivalent Stress ◽  
Element Model ◽  
Element Analysis ◽  
Elastic Plastic ◽  
The Finite Element Analysis

Strain clamp is an important connection device in guy tower. If the quality of the compression splicing position is unsatisfied, strain clamp tends to be damaged which may lead to the final collapse of a guy tower as well as huge economic lost. In this paper, stress distribution on the compressible tube and guy cable is analyzed by FEM, and a large equivalent stress of guy cable is applied to the compression splicing position. During this process, a finite element model of strain clamp is established for guy cables at compression splicing position, problems of elastic-plastic and contracting are studied and the whole compressing process of compressible position is simulated. The guy cable cracks easily at the position of compressible tube’s port, the inner part of the compressible tube has a larger equivalent stress than outside.

Research on the Forming Path for Fabricating the Sheet-Metal Part with Non-Horizontal End Face Using CNC Incremental Forming

2014 ◽  
Vol 599-601 ◽  
pp. 413-416 ◽  
Author(s):  
Hu Zhu ◽  
Jin Ju ◽  
Yi Bo Liu
Keyword(s):  
Sheet Metal ◽  
Incremental Forming ◽  
Analysis Method ◽  
Metal Part ◽  
Element Analysis ◽  
Sheet Metal Parts ◽  
Cnc Incremental Forming ◽  
Forming Technology ◽  
The Finite Element Analysis

For the purpose of the fabrication of the sheet-metal parts with non-horizontal end face using the sheet metal CNC incremental forming technology, two kinds of path generating methods, namely the level path perpendicular to Z axis method and the equidistant path parallel to sheet metal are proposed in this paper. Both of the paths are generated by Visual C++ and OpenGL graphics library, the effect of the two kinds of forming paths to the forming quality of the sheet part with non-horizontal end face is researched using the finite element analysis method in this paper.

Application of Numerical Simulation in Optimizing Rubber Injection Molding Process

2013 ◽  
Vol 561 ◽  
pp. 390-394
Author(s):  
Hui Min Zhang ◽  
Jia Teng Niu ◽  
Lei Lei Dong
Keyword(s):  
Numerical Simulation ◽  
Production Efficiency ◽  
Mold Temperature ◽  
Injection Molding Process ◽  
Melt Flow ◽  
Molding Process ◽  
Melt Temperature ◽  
Numerical Simulation Methods ◽  
Quality Of Products

The rubber melt flow processes was studied through the numerical simulation methods. According to the two important factors of the melt temperature and mold temperature, the paper designs three plans, analyzed rubber melt flow front temperature, volume curing rate and volume curing rate at the end of filling in different melt temperature and mold temperature and found the best solution, so that curing time was shorten and production efficiency was improved under the precondition of filling smoothly mold and ensuring quality of products.

Numerical Simulation of Stress and Deformation on Heat Transfer

2011 ◽  
Vol 422 ◽  
pp. 842-845
Author(s):  
Xue Ping Wang ◽  
Ying Zhang ◽  
Pan Li ◽  
Zhen Wei Zhang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Heat Exchange ◽  
Structure Design ◽  
Stress And Strain ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Stress And Deformation

This paper primarily simulates the heat exchange part’s stress and strain situation under the load of temperature and gravity and their coupling impact aiming at obtaining the stress and deformation distribution. The authors took advantage of the method of the finite element analysis to study the stress and strain situation. Through the analysis, each part of the transfer’s stress and strain can be calculated. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

The Numerical Simulation Research of the Deformation Character for the Soft Clay Foundation in the Unloading Condition

2011 ◽  
Vol 90-93 ◽  
pp. 1736-1742
Author(s):  
Bin Tang ◽  
Ren Wang ◽  
Hong Xing Wang
Keyword(s):  
Numerical Simulation ◽  
Soft Clay ◽  
Analysis Software ◽  
Engineering Project ◽  
Element Analysis ◽  
Simulation Research ◽  
Deformation Curves ◽  
Surcharge Preloading ◽  
The Finite Element Analysis ◽  
Step Loading

Abstract: The numerical simulation of the deformation character in the effect of the unloading action for the surcharge preloading in the heap preloading treated foundation in the Sixin South Road in the New District in Wuhan is done through the finite element analysis software ABAQUS according to the engineering project ,and the following conclusions are gained:(1)on the surface of the foundation, the settlement at the center is the biggest, the settlement decreases with distance from the center of the surface, ,and at about 20m away from the center, the uplift is produced ;(2)after unloading, the resilience emerges in the places where the settlement was produced, and the uplift that was produced drops too;(3)the deformation on the axle of the foundation section at the end of the loading action and that at the end of the unloading action are similar to each other;(4) in the step loading-unloading condition, the deformation curves suit well with the loading-unloading curves.

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