Deformation Analysis of Aero Thin-Walled Workpiece Under Multi-Stress Coupled Effect

2007 ◽  
Author(s):  
Dong Lu ◽  
Jianfeng Li ◽  
Yiming Rong ◽  
Jie Sun ◽  
Song Zhang ◽  
...  
Keyword(s):  
Initial Stress ◽  
Initial Conditions ◽  
Stable Condition ◽  
Coupled Model ◽  
Element Model ◽  
Milling Process ◽  
Deformation Analysis ◽  
Reaction Forces ◽  
Milling Forces ◽  
The Finite Element Model

Cutting stress coupled with clamping stress and initial stress affects the workpiece deformation. To predicate the workpiece deformation during machining, the multi-stress coupled model was developed. The finite element model of milling process is established and the milling forces were predicted. The predicated milling force, clamping force and initial stress were taken as initial conditions and were inputted into the multi-stress coupled model. Workpiece deformation during machining and reaction forces of locators were predicated. To maintain workpiece in a stable condition during machining, reaction forces of the locators when the cutting tool moving along the clamp side must be monitored.

Deformation Analysis of Thin-Walled Workpiece under Multi-Stress Coupled Effect

2010 ◽  
Vol 426-427 ◽  
pp. 284-288
Author(s):  
Dong Lu ◽  
Guo Hua Qin ◽  
Yi Ming Rong ◽  
C.M. Peng
Keyword(s):  
Initial Stress ◽  
Coupled Model ◽  
Element Model ◽  
Milling Process ◽  
Machining Process ◽  
Deformation Analysis ◽  
Milling Force ◽  
Thin Walled ◽  
And Control ◽  
The Finite Element Model

This document Cutting stress coupled with clamping stress and initial stress affects the workpiece deformation. To analyze the workpiece deformation the initial stress model is developed. The finite element model of milling process is established and the milling force and milling heat is predicted. The multi-stress coupled model is developed and the workpiece deformation during machining process and deformation after fixtures released are predicted. This study is helpful to predict and control the deformation for thin-walled workpiece.

The Finite Element Model of Discontinuous Rock Masses

2011 ◽  
Vol 243-249 ◽  
pp. 2948-2951 ◽  
Author(s):  
Heng Bin Wu ◽  
Ze Ping He
Keyword(s):  
Finite Element ◽  
Limit Equilibrium ◽  
Element Model ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Sliding Surface ◽  
Discontinuous Deformation ◽  
Discontinuous Rock ◽  
Element Theory ◽  
The Finite Element Model

The traditional limit equilibrium theory could not consider the discontinuous property of rock slope, and the existing research methods for the discontinuous rock mass confined to the Discrete Element Method and Discontinuous Deformation Analysis. Based on the finite element theory, considering the strength reduction of the joint mechanical parameters, the slope stability with one or two sets joints are analyzed in this paper. The results show that, the sliding surface for one set joint slope is close to the joint dip, and the sliding surface for two sets joints slope is close to the control joint dip.

Research on Processing Technology and Cutting Parameter of the Spiral Surface of Screw Rotor

2011 ◽  
Vol 314-316 ◽  
pp. 543-546
Author(s):  
Xing Wei Sun ◽  
Guang Lv ◽  
Ke Wang
Keyword(s):  
Cutting Parameters ◽  
Element Model ◽  
Milling Process ◽  
Screw Compressor ◽  
Processing Quality ◽  
Excellent Performance ◽  
Single Screw ◽  
Screw Rotor ◽  
Spiral Surface ◽  
The Finite Element Model

The key components of the single screw compressor are rotor screw and two star-wheels which are symmetrical arrangement. The rotor screw and two star-wheels have composed a special spatial meshing pair. The high meshed precision is the guarantee of its excellent performance. In this paper, we will study the milling technology of screw milling cutter to the rotor screw, and establish the finite element model of the cutter, and analyze the cutter’s stress situation during the milling process, make the cutting parameters of the screw optimization, In this paper, we will also study the influence of the Milling depth and cutting width to tool in displacement and stress, in order to provide a theoretical reference of selecting of appropriate cutting parameters ,improving of processing quality and reducing wear of the tool.

Stress Analysis for Electric Stop Valve of Nuclear Power Plant Considering Action of Preload and Stem Force

2013 ◽  
Vol 313-314 ◽  
pp. 1210-1213
Author(s):  
Ji Wang ◽  
Jian Hua Zheng
Keyword(s):  
Finite Element ◽  
Power Plant ◽  
Nuclear Power ◽  
Thermal Stresses ◽  
Fluid Pressure ◽  
Element Model ◽  
Stop Valve ◽  
Valve Stem ◽  
Reaction Forces ◽  
The Finite Element Model

The finite element model of electric stop valve with flange bolts preload and valve stem force was established to improve the valve stress calculation method which was based only on action of fluid pressure, thermal stresses and pipe reaction forces. The principle and application of pretension load elements were expounded. By ANSYS, the stresses of this valve with preload and valve stem force were calculated, and the Mises equivalent stresses contour and some values of key position of whole valve were obtained. The results indicate the influence of the stresses on the valve caused by preload of bolt mounted on the flange and valve stem force can not be ignored.

Effect of Extension Coefficient on H-Beam Deformation

2010 ◽  
Vol 20-23 ◽  
pp. 1199-1204 ◽  
Author(s):  
Xian Zhang Feng ◽  
Qun Li
Keyword(s):  
Initial Conditions ◽  
Metal Flow ◽  
Element Model ◽  
Deformation Degree ◽  
Simulation Based ◽  
Simulation Results ◽  
Contact Situation ◽  
H Beam ◽  
The Finite Element Model ◽  
The Web

In order to research the effect of metal flow between web and flange, the concept of extension coefficient used to judge the deformation degree for rolling H-beam, through the method of changing the extension coefficient, the finite element model was established by the platform of CAD software. Defining boundary conditions, geometric properties and contact situation, and input initial conditions based on the model. It can gain the displacement cloud map and displacement curves of the model by computer simulation. Based on the simulation results, studying the effects of different extension coefficient on metal flowing between flange and web, as well as the qualitative relations of extension coefficient between flange and web. The results showed that with the enlargement of extension coefficient, the metal flowing between web and flange would be more obvious, while the definite feature relation between web and flange can get better effects with the condition that the extension coefficient of flange is large than that of the web.

The Thermo-Hydro Coupled Model of Low-Temperature Rock In Consideration of Phase Change

2008 ◽  
Vol 33-37 ◽  
pp. 645-650 ◽  
Author(s):  
Quan Sheng Liu ◽  
Guang Miao Xu ◽  
Yue Xiu Wu
Keyword(s):  
Mathematical Model ◽  
Low Temperature ◽  
Phase Change ◽  
Initial Conditions ◽  
Coupled Model ◽  
Physical And Mechanical Properties ◽  
Element Model ◽  
Coupling Model ◽  
Cold Regions ◽  
Transmission Pipeline

Considering the influence of phase change and temperature variation on the physical and mechanical properties of low-temperature rock in cold regions, the mathematical model for the Thermo-Hydro(TH) coupled problem is proposed based on the theory of convective heat transfer for porous medium. In this model, the influence of moisture migration on heat conduction in rock is taken into account, as well as the influence of temperature gradient on the seepage. The involved parameters are determined according to the related equations given in this paper. Then the finite element model of a gas transmission pipeline in cold region is established using the proposed mathematical model. By selecting suitable boundary conditions, initial conditions and heat computation parameters, the freezing problem of low-temperature rock surrounding the pipeline is analyzed. The calculated values of the temperature field and the measured data are basically consistent, which indicates that the proposed TH coupling model for rock in cold regions is reasonable and reliable.

The Application of FEM Technology on the Deformation Analysis of the Aero Thin-Walled Frame Shape Workpiece

2006 ◽  
Vol 315-316 ◽  
pp. 174-179 ◽  
Author(s):  
H. Guo ◽  
Dun Wen Zuo ◽  
S.H. Wang ◽  
Min Wang ◽  
L.L. Xu ◽  
...  
Keyword(s):  
Complex Structure ◽  
Element Model ◽  
Deformation Analysis ◽  
Machining Accuracy ◽  
National Defense ◽  
Residual Stress Field ◽  
Machining Deformation ◽  
Thin Walled ◽  
And Control ◽  
Milling Forces

Many thin-walled structure components widely used in aero industries not only have complex structure and large size, but also need high machining accuracy. However, because of their poor rigidity, it is easy to bring machining deformation caused by the existence of the initial residual stresses, the fixing stresses, cutting forces and cutting heat. The difficulty in ensuring their machining accuracy becomes a big problem, so that how to effectively predict and control the machining deformation has become an important subject in the development and production of our national defense weapons. This paper established a 3-D Finite element model with consideration of milling forces, clamping forces and initial residual stress field. By using this model, machining deformation of thin-walled frame shape workpieces has been computed. The simulated results are compared with experimental data, and the correctness of the simulation is verified. The study is helpful to the prediction and the control of machining deformation for thin-walled parts.

Finite Element Simulation of Ti-6Al-4V Three-Dimensional Milling

2010 ◽  
Vol 426-427 ◽  
pp. 701-704
Author(s):  
Y. Zhao ◽  
Feng Xu ◽  
Dun Wen Zuo ◽  
Jing Kang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Milling Process ◽  
Arbitrary Lagrangian Eulerian ◽  
Geometry Model ◽  
Element Simulation ◽  
Dimensional Distribution ◽  
The Finite Element Model

In this paper, by adopting an equivalent geometry model of the cutting layer, a three-dimensional (3D) finite element model was built to investigate the milling of Ti-6Al-4V. The chip separating process was simulated by Arbitrary Lagrangian-Eulerian (ALE) method and automatic re-meshing technology. The experiments of milling Ti-6Al-4V were carried out to verify finite element model of milling process. The comparisons of the predicted cutting forces and the measured forces showed reasonable agreement. Finally, the finite element model was used to predict the chip deformation and the three-dimensional distribution of cutting force, stress and temperature in milling Ti-6Al-4V.

scholarly journals The Nonlinear Dynamic Behavior Analysis and Research for Sheet Steel Stamping Forming Problems Based on Finite Element Method

2015 ◽  
Vol 9 (1) ◽  
pp. 198-202
Author(s):  
Li Zhang ◽  
Tao Zhang ◽  
Kaiteng Wu
Keyword(s):  
Finite Element ◽  
Initial Conditions ◽  
Equations Of Motion ◽  
Sheet Steel ◽  
Element Model ◽  
Stress Strain ◽  
Contact Conditions ◽  
Deformation Stages ◽  
Element Algorithm ◽  
The Finite Element Model

A numerical framework for the simulation of sheet steel stamping forming is presented. The main problems, the equations of motion, the constitutive relation, the initial conditions, boundary conditions and contact conditions, are presented in detail. Based on this, the finite element model is established and solved for exploring the changes in laws of stress, strain and so on. The information on stress, strain and load displacement is obtained at different deformation stages. The numerical results show that the finite element algorithm can effectively simulate the deformation process of sheet steel which helps to explain that the numerical framework is feasible for sheet steel stamping forming problems.

Radial Deformation Analysis of Complex Parts with Centrifugal Force and Heat Effect

2014 ◽  
Vol 889-890 ◽  
pp. 254-261
Author(s):  
Li Li Yue ◽  
Ping Liao ◽  
Peng Wang ◽  
Yue Song Wu
Keyword(s):  
Element Model ◽  
Deformation Analysis ◽  
Radial Deformation ◽  
Centrifugal Effect ◽  
Structural Coupling ◽  
Simulation Results ◽  
Twisted Blade ◽  
Computing Method ◽  
Complex Parts ◽  
The Finite Element Model

A stream turbine bowed and twisted blade has been taken as an example for complex parts. Firstly, a simplified computing method for the blade with centrifugal effect is put forward. Then the finite element model of complex parts with centrifugal effect is established. Simulation results show that errors between calculation and simulation results are less than 15%, the simplified computing method has good application value. In addition, the impacts of centrifugal and heat on blade radial deformation are discussed by thermal structural coupling analysis. Numerical simulation results show that heat is the major factor that affects blade radial deformation.

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