scholarly journals A Research on the Creep Age Forming of 2524 Aluminum Alloy: Springback, Mechanical Properties, and Microstructures

2014 ◽  
Vol 6 ◽  
pp. 707628 ◽  
Author(s):  
Lihua Zhan ◽  
Sige Tan ◽  
Youliang Yang ◽  
Minghui Huang ◽  
Wenqi Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Prediction Models ◽  
Stress Gradient ◽  
Sheet Thickness ◽  
Linear Regression Method ◽  
Forming Process ◽  
Bending Radius ◽  
Springback Prediction ◽  
Creep Age Forming

A series of orthogonal tests have been designed to investigate the combined effects of aging temperature, time, predeformation, and part thickness features on the springback of creep age forming of 2524 aluminum alloy sheets. Two springback prediction models containing the four process parameters mentioned above are developed based on experimental results and the multiple linear regression method. The comparisons of predicted and experimental values of springback yield good agreement. The dependence of springback on stress gradient across the thickness of sheet is examined in detail, showing that springback increases with the decrease in stress gradient while maintaining the ratio of bending radius to sheet thickness ( R0/ H) as constant. In addition to springback, the mechanical properties and microstructural evolution are also researched. In the creep age forming process, the compression side of the sheet has higher mechanical properties and is characterized by more and finer precipitates in grains as compared to tension side.

scholarly journals Investigating of Mechanical Behavior of AA5083 in the Pressing Process Using Finite Element Analysis

2017 ◽  
Vol 11 (9) ◽  
pp. 51
Author(s):  
Babak Beglarzadeh ◽  
Behnam Davoodi
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Friction Stress ◽  
Forming Process ◽  
Element Analysis ◽  
Cold Forming ◽  
Aluminum Alloy 5083 ◽  
And Control

The process of cold forming is considered of the most different industries and the use of such process in the manufacture of components and small parts has expanded. Therefore, analyzing the behavior of metals in this process to identify and control durability that is the main factor of limiting process has particular importance in industrial forming processes. In this study, cold forming process of aluminum metal has been studied and its effect on its mechanical properties has been evaluated. For this purpose, first modeling piece of aluminum alloy 5083 for cold forming process is carried out and using finite element analysis, mechanical properties of considered piece during cold forming processes are investigated. The results show that by reducing friction, stress and strain during the process will reduce, thereby durability of the piece increases, or in other words, ductile fracture occurs in longer life and higher stresses. The results show that by proper forming operations, it can be improved the strength and durability of aluminum alloy. Finally, validation of results, by comparing simulation results with experimental results is carried out.

scholarly journals Effect of Incremental Shrinking Process on Mechanical Properties and Microstructure of Alloy through Electron Backscatter Diffraction Analysis

2021 ◽  
Vol 2083 (2) ◽  
pp. 022079
Author(s):  
Zhengwei Gu ◽  
Yusheng Li ◽  
Ziming Tang ◽  
Ge Yu
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Electron Backscatter Diffraction ◽  
Mechanical Tests ◽  
Mechanical Anisotropy ◽  
Forming Process ◽  
Ebsd Data ◽  
Electron Backscatter ◽  
Shrinking Process ◽  
Backscatter Diffraction

Abstract In recent years, the incremental shrinking process has been widely used in the forming process of aluminum alloy components for the railway vehicles. The effect of the incremental shrinking process on the performance and microstructure of 6082-T6 aluminum alloy was investigated through mechanical tests and electron backscatter diffraction (EBSD) analysis. The tensile test specimens prepared in different rolling orientations (0˚,45˚and 90˚) along the original and deformed sheets exhibited the mechanical anisotropy. After the incremental shrinking process, the average microhardness, tensile strength, and yield strength of this alloy were respectively increased by nearly 8.78%,2.26%,2.72%, while the Elongation was decreased by almost 31.67%. By analyzing the EBSD data, the strength of the material is increased by the incremental shrinking process and its mechanical anisotropy is improved, whereas its plasticity is greatly deteriorated.

Experimental Studies and FEM Analysis on the Creep Age Forming for Aluminium Alloy 7050

2013 ◽  
Vol 773-774 ◽  
pp. 144-152 ◽  
Author(s):  
Xia Huang ◽  
Yuan Song Zeng ◽  
Pen Tao Gai
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Equations ◽  
Experimental Studies ◽  
Fem Analysis ◽  
Age Hardening ◽  
Maximum Relative Error ◽  
Forming Process ◽  
Creep Tests ◽  
Whole Process ◽  
Creep Age Forming

Creep age forming (CAF) is a combined creep forming and age hardening treatment process. How to control the springback after forming is one of the key problems for the process. In this paper, Creep tests were conducted for different stress levels at 160°C for 25h, which is the suitable parameters for CAF process of aluminum alloy 7050T451. Based on experimental results, a set of mechanism-based creep constitutive equations was formulated. The six material constants of the constitutive equations were determined by non-linear least squares fitting methods. The creep age forming process for aluminum alloy 7050T451 plate was simulated by using FE software ABAQUS through the subroutine CREEP. The effects of the forming parameters on the springback were analyzed. Finally, experimental research was performed. It is found that the developed numerical simulation can be used to simulate the whole process of creep age forming process. The maximum relative error is 6.9%.

2124 Aluminum Alloy Aging Forming Springback Study Based on a Combination Forecasting Method

2014 ◽  
Vol 541-542 ◽  
pp. 277-282
Author(s):  
Zhong Gan ◽  
Zhi Wei Qian ◽  
Yu Shan Xia
Keyword(s):  
Neural Network ◽  
Aluminum Alloy ◽  
Bp Neural Network ◽  
Prediction Error ◽  
Uniform Design ◽  
Prediction Method ◽  
Combination Method ◽  
Forecasting Method ◽  
Bending Radius ◽  
Springback Prediction

This paper proposes a more accurate springback prediction method of ageing forming for 2124 aluminum alloy. In age forming of panels, pre-bending radius, aging time and wall thickness of panels are selected as three parameters, make use of uniform design to arrange experiment and obtain springback radius using ABAQUS simulation. By means of regression analysis, the data is processed to get the influence caused by parameters on springback radius. Regression and BP neural network forecasting method are used respectively to predict springback radius and maximum prediction error is less than 31%. Combination method based on BP neural network is adopted and this method gets the satisfying prediction results that prediction error is within 5%. So conclusion can be drawn that prediction accuracy of combination method is much better than that of regression and BP neural network forecasting.

Influence of Element Types on Springback Prediction of Creep Age Forming of Aluminum Alloy Integral Panel

2013 ◽  
Vol 773-774 ◽  
pp. 512-517 ◽  
Author(s):  
Li Hua Zhan ◽  
Xiao Long Xu ◽  
Ming Hui Huang
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
High Strength ◽  
Simulation Method ◽  
Age Hardening ◽  
Width Ratio ◽  
Shell Elements ◽  
3D Solid ◽  
Springback Prediction ◽  
Creep Age Forming

Creep Age Forming (CAF) is an effective forming technique combined forming and heat treatment, based on creep and age hardening characteristics of some aluminum alloys. It has been widely used to manufacture large integral panels with airfoil sections and complex curvatures of high strength aluminum alloy. The aim of this paper is to study the influence of element types on springback prediction of creep age forming of aluminum alloy integral panel. Firstly, the finite element models are built by 3D-solid elements and Shell elements separately. And then a set of creep aging constitutive equations of 7055 aluminum alloy are implemented into the commercial FE solver MSC.MARC through user defined subroutine. Finally, springback values predicted by 3D-solid elements model and Shell elements model respectively are compared under different height to width ratios. Some important conclusions were drawn. For the reinforcing panel with the height to width ratio is more than 5:1, shell elements should be used to get more accurate springback prediction result. If the height to width ratio is less than 5:1, solids elements should be used. Above conclusions provide theoretical basis for the study of CAF of the aluminum alloy integral panel by finite element simulation method.

Computer Simulation of Forming Technology of Thin Aluminum Engine Cylinder Liners Based on LS-DYNA

2012 ◽  
Vol 203 ◽  
pp. 290-294
Author(s):  
Han Wu Liu ◽  
Hong De Ren ◽  
Han Xun Lv
Keyword(s):  
Aluminum Alloy ◽  
Spray Deposition ◽  
Equivalent Stress ◽  
Stress Gradient ◽  
Cylinder Liner ◽  
High Strength ◽  
Extrusion Process ◽  
Forming Process ◽  
Engine Cylinder ◽  
Spinning Process

The high-silicon aluminum alloy by spray deposition forming is well suited for the engine cylinder liner because of the need of high strength and abrasion resistance, but its forming process is much complex, and many process parameters are involved. In order to lower the investments of time, labor power and money due to the traditional processing methods that need to adjust the craft parameters frequently, the thermal extrusion process and the spinning process that are the most important forming processes in aluminum alloy cylinder liner forming are simulated by the finite element simulation technology. It is found that during the extrusion process, the equivalent stresses near the die are larger, and uneven, the stress gradient is very large, but the maximum stress does not exceed the allowable stress of the material through the numerical simulation; In the spinning process, the stress and deformation are larger at the beginning of the process, but they will have a slight decreasing with the spinning process going on. Throughout the spinning process, the equivalent stress and strain distribution of the spinning component maintained a relatively balanced state basically, which is consistent with the later experimental results. It proves the reliability of the the simulation.

Creep Age-Forming Experiment and Springback Prediction for AA2524

2012 ◽  
Vol 457-458 ◽  
pp. 122-129 ◽  
Author(s):  
Li Hua Zhan ◽  
Si Ge Tan ◽  
Ming Hui Huang ◽  
Jie Niu
Keyword(s):  
Mechanical Properties ◽  
Prediction Model ◽  
Process Parameters ◽  
Aluminium Alloys ◽  
Theoretical Basis ◽  
Age Hardening ◽  
Work Piece ◽  
Influence Of Process Parameters ◽  
Springback Prediction ◽  
Creep Age Forming

Creep age-forming (CAF) technology is a new forming method, which combined age hardening and creep forming processes into one. It is mainly used to manufacture wing panels. In this paper, a set of experimental device of creep age forming is developed and the influence of process parameters on the springback of artificially aged 2524 aluminium alloys (AA2524) are investigated. The law of the comprehensive effect of aging time, aging temperature, elastic pre-deformation radius and work-piece thickness, on creep aging springback and mechanical properties of AA2524 is obtained. Based on multiple regression analysis, springback prediction model of process parameters is established and further proven experiments have then been carried out. The result shows that the maximum springback deviation between the experimental results and the prediction ones is within 9.5%. The accuracy of springback prediction model is validated, which provides a theoretical basis for process parameter optimization and springback prediction of CAF.

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