Study on the Deformations Caused by the Original Residual Stresses of Aluminum Alloy

2014 ◽  
Vol 875-877 ◽  
pp. 1016-1020 ◽  
Author(s):  
Zhi Tao Tang ◽  
Tao Yu ◽  
Li Qiang Xu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Theoretical Analysis ◽  
Residual Stresses ◽  
Material Removal ◽  
Research Results ◽  
Machining Distortion ◽  
Machining Deformation ◽  
Optimal Value

The machining deformations caused by the release and redistribution of original residual stresses were studied by the theoretical analysis and finite element method. The research results show that the release and redistribution of original residual stresses result in machining distortion of the plate part. There exists an optimal value of material removal amount according to original residual stresses. When the amount of the material removed exceeds the optimal value, the machining deformation can be controlled effectively.

Study on the machining distortion of aluminum alloy parts induced by forging residual stresses

2016 ◽  
Vol 231 (4) ◽  
pp. 618-627 ◽  
Author(s):  
Liangbao Liu ◽  
Jianfei Sun ◽  
Wuyi Chen ◽  
Pengfei Sun
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Residual Stresses ◽  
Material Removal ◽  
Actual Condition ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Layer Removal Method ◽  
Analytical Correction

A weak-rigid monolithic component is subjected to significant distortion after the removal of material. This condition is principally due to flexibility of the part and the release of initial residual stresses resulting from fabrication. This article reports a systematic study on the measurement of initial residual stresses and the distortion of a windshield frame part induced by material removal from the forged blanks of aluminum alloy 7085-T7452. A layer-removal method was employed to measure the stress profiles of the blank. The stresses after analytical correction were found to be closer to actual condition. The effect of material removal on distortion from stressed blank was investigated using the finite element analysis software ANSYS. The simulated results indicate that after the proportion of removed material exceeds 60%, part distortion becomes stable. The comparisons of the simulation with experimental data suggest sufficient agreement with conclusion that the use of finite element analysis proves to be an attractive and reliable method for predicting stress-induced distortion.

Influence of Initial Temperature of Chilling Treatment on Residual Stress State of TIG Dressing Zone for T-Joint Welded Toe

2012 ◽  
Vol 268-270 ◽  
pp. 529-533
Author(s):  
Chun Yuan Shi ◽  
Ping Zhu ◽  
Kun Zhou
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Residual Stresses ◽  
Initial Temperature ◽  
Residual Stress Distribution ◽  
Residual Stress State ◽  
Significant Change ◽  
Chilling Treatment

Using finite element method, the residual stress distribution of TIG dressed welded toe followed by chilling treatment with different temperature of steel and aluminum alloy T-joint was calculated. And the residual stresses of welded toe were also measured by using the blind-hole method. The results indicate that with the increase of initial temperature of chilling treatment, the longitudinal residual stresses in welded toe of steel joint are gradually transited from tensile residual stresses to compressive ones, and there is no significant change for transverse residual stresses; and the longitudinal residual stresses in welded toe of aluminum alloy joint are compressive stress and gradually increased, no significant change for transverse residual stresses.

scholarly journals Grinding Surface Creation Simulation Using Finite Element Method and Molecular Dynamics

2012 ◽  
Vol 500 ◽  
pp. 314-319 ◽  
Author(s):  
Xun Chen ◽  
Tahsin Tecelli Öpöz ◽  
Akinjide Oluwajobi
Keyword(s):  
Finite Element Method ◽  
Molecular Dynamics ◽  
Finite Element ◽  
Material Removal ◽  
Removal Mechanism ◽  
Material Removal Mechanism ◽  
Research Results ◽  
Size Scales ◽  
Element Method

This paper presents some research results of the application of finite element method and molecular dynamics in the simulation of grinding surface creation. The comparison of these two methods shows that both methods could illustrate the material removal phenomena and provide useful information of grinding mechanics, but they have different feasible application arranges depending on the level of size scales. The investigation demonstrated that rubbing hypothesis of grinding material removal mechanism is valid at all size level even down to nanometre level. Further investigation areas are identified in the paper.

scholarly journals Analysis of Dynamic Characteristics of a Propeller Blade Subjected to Large Material Removal in Milling

2020 ◽  
pp. 10-14
Author(s):  
Luyi Han ◽  
◽  
Riliang Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Behavior ◽  
Dynamic Characteristics ◽  
Material Removal ◽  
Natural Frequencies ◽  
Machining Process ◽  
Time Varying ◽  
Propeller Blade ◽  
Large Material

A propeller blade, as a typical example of low-rigidity components, is prone to chatter and deformation in machining process, especially when large material removal is applied. In order to foresee the problems and then optimize the process, identification of the dynamic behavior of the workpiece is of great importance. This paper studies the dynamic characteristics of the workpiece in the machining process from plate to propeller blade using Finite Element Method. The results show that the time-varying natural frequencies of the workpiece decrease gradually at the beginning steps of the process due to the influence of material removal, and increases afterwards influenced by the geometry of the blade.

Effects of Sheet Thickness on Residual Stress Distribution by Laser Shock Processing of 7050-T7451 Aluminum Alloy

2011 ◽  
Vol 189-193 ◽  
pp. 3778-3781
Author(s):  
Yin Fang Jiang ◽  
Lei Fang ◽  
Zhi Fei Li ◽  
Zhen Zhou Tang
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Sheet Thickness ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Element Analysis ◽  
Finite Element Software ◽  
Shock Processing

Laser shock processing is a technique similar to shot peening that imparts compressive residual stresses in materials for improved fatigue resistance. Finite element analysis techniques have been applied to predict the residual stresses from Laser shock processing. The purpose of this paper is to investigate of the different sheet thickness interactions on the stress distribution during the laser shock processing of 7050-T7451 aluminum alloy by using the finite element software. The results indicate that the sheet thickness has little effects on the compression stress in the depth of sheet, but great impacts on the reserve side.

On Correlation of Pulses and Tool Elongations at Micro-Electrical Discharge Machining Aided by Ultrasonics

2015 ◽  
Vol 809-810 ◽  
pp. 309-314
Author(s):  
Daniel Ghiculescu ◽  
Nicolae Marinescu ◽  
Tomasz Klepka ◽  
Nicoleta Carutasu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electrical Discharge ◽  
Material Removal ◽  
Electrical Discharge Machining ◽  
Removal Mechanism ◽  
Material Removal Mechanism ◽  
Micro Electrical Discharge Machining ◽  
Machining Strategy ◽  
Element Method

The paper deals with Finite Element Method (FEM) of thermal and mechanical-hydraulic components of material removal mechanism at micro-electrical discharge machining aided by ultrasonics (μEDM+US), due to EDM and US contribution. The dimensions of craters produced by single discharges under μEDM+US conditions are determined with different pulse durations in order to establish a machining strategy with correlation of pulses and tool elongations.

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