scholarly journals Influence of the Curvature of the Multipoint Die for Flexible Multipoint Stretch Bending on the Quality of Aluminum Profile

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Yi Li ◽  
Rui Li ◽  
Ce Liang ◽  
Jicai Liang ◽  
Fei Teng
Keyword(s):  
Numerical Simulation ◽  
Rational Design ◽  
Simulation Analysis ◽  
Great Influence ◽  
Reference Value ◽  
Geometrical Parameters ◽  
Shape Error ◽  
Stress Strain ◽  
Shape Accuracy ◽  
Stretch Bending

The finite element numerical simulation method was used to study the stretch-bending process of asymmetric L-section aluminum alloy profiles. The geometrical parameters of the multipoint dies (MPDs) are studied to influence the shape accuracy and springback of the L-section profile after bending. The results show that the profile curvature of the MPD after the profile is bent has a great influence on the stress-strain distribution, springback value, and shape accuracy. In order to obtain uniform stress-strain of the profile and reduce the springback and shape error, the MPD is optimized by numerical simulation analysis, which has a certain reference value of providing a theoretical basis for the rational design of the flexible stretch-bending.

scholarly journals Effect of Flexible 3D Multipoint Stretch Bending Dies on the Shape Accuracy and the Optimal Design

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Xiangfeng Lin ◽  
Yi Li ◽  
Zhongyi Cai ◽  
Jicai Liang ◽  
Ce Liang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Surface Modification ◽  
Simulation Analysis ◽  
Shape Error ◽  
Shape Accuracy ◽  
Finite Element Software ◽  
Stretch Bending ◽  
Aluminum Profile ◽  
Die Surface ◽  
Bending Process

Aiming at the flexible 3D stretch bending with multipoint dies for the aluminum profile, the numerical simulation analysis of the bending process was carried out by ABAQUS finite element software. In the multipoint stretch bending (MPSB) process, the influence of the number of die units on the springback for the complex section profile was studied. The shape error between the forming parts and the target parts was reduced through the method of die surface modification. The results showed that the springback of the aluminum profile could reach a minimum when the number of die units was 25 under the precondition of saving cost and ensuring the quality of forming parts. In the numerical simulation, the maximum shape error of the forming parts reduced from 18.824 mm to 2.456 mm; in the test, the maximum shape error reduced from 27.26 mm to 6.03 mm through the method of die surface modification.

Influence of movement tracks on the forming quality of profiles fabricated by flexible stretch bending of multi-point roller dies technology

2021 ◽  
pp. 095440542110606
Author(s):  
Chuandong Chen ◽  
Jicai Liang ◽  
Yi Li ◽  
Ce Liang
Keyword(s):  
Numerical Simulation ◽  
Great Influence ◽  
Thickness Variation ◽  
Shape Error ◽  
Thickness Change ◽  
Forming Quality ◽  
Stretch Bending ◽  
Research Objects ◽  
Simulation Results

In the flexible stretch bending of multi-point roller dies process, the deformation of workpiece is mainly driven by clamps. Therefore, the movement track of clamp has a great influence on the forming effect of workpiece. Y-profile, T-profile, and L-profile are taken as the research objects. Simulation and experiments are carried out with two different movement tracks. The influence of the movement tracks on shape error, springback error, and thickness variation of different profiles is discussed. The experimental results of the three profiles processed by the double-sided forming method are consistent with the simulation results, which proves the accuracy of the numerical simulation. The results show that the movement track has a great influence on shape error. Compared with double-sided forming, one-sided forming can effectively reduce springback error. The two different movement tracks have no obvious influence on thickness change.

The Research of the Relative Rigid Effect in the Numerical Simulation of the Steel Plate Reinforced Concrete Coupling Beams

2014 ◽  
Vol 638-640 ◽  
pp. 283-286
Author(s):  
Li Song ◽  
Dong Chen ◽  
Bao Lei Li
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Steel Plate ◽  
Simulation Analysis ◽  
Great Influence ◽  
Shear Walls ◽  
Internal Force ◽  
Coupling Beams ◽  
Loading Mode ◽  
Deformation Properties

The coupling beam work as an important component in coupled shear walls, the strength,stiffness and deformation properties of which have great influence on the seismic performance of shear walls, the steel plate reinforced concrete coupling beams have the advantages as follows: simplify the constructional details, make the construction convenient and reliable performance [1][2]. The numerical simulation model in this paper is a coupled shear wall connected by steel plate reinforced concrete coupling beams in reference [3], and the loading mode is the same as the reference [4] . The relative stiffness effect was explored by study the internal force and displacement of the model with changing the stiffness of the coupling beams and the shear walls while the span-depth ratio is stable .The study will provide a reference for the numerical simulation of the finite element simulation analysis of the coupling beams and the steel reinforced concrete structures.

Study on Damage Identification of Simple Beam Bridge Based on the First-Order Curvature Mode Ratio

2014 ◽  
Vol 578-579 ◽  
pp. 1032-1036
Author(s):  
Yong Qin
Keyword(s):  
Numerical Simulation ◽  
Damage Identification ◽  
Simulation Analysis ◽  
Reference Value ◽  
Index Method ◽  
Structure Damage ◽  
First Order ◽  
Damage Degree ◽  
Practical Engineering ◽  
Beam Bridge

Starting with damage identification index method on the basis of the curvature mode, the first-order curvature mode ratio is proposed, and then it is made a numerical simulation analysis for a single span simple beam bridge with ANSYS. The identification of structure damage degree under the damage on the single position is studied. The fitted polynomial based on the derivation of the first-order curvature mode ratio can estimate the damage degree; it has a good reference value for the damage detection of structures in practical engineering.

Numerical Simulation Analysis on Repairing Hole of UAV Wing

2013 ◽  
Vol 690-693 ◽  
pp. 2891-2895
Author(s):  
Guo Dong Jin ◽  
Li Bin Lu ◽  
Liang Xian Gu ◽  
Juan Liang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Service Life ◽  
Simulation Analysis ◽  
High Stress ◽  
Reference Value ◽  
Safety Standards ◽  
Aerial Vehicle ◽  
Element Method

Parachute recovery of UAV is often caused of holes and other injuries on wings, that are required repair and maintenance. The surface of the patch will form the high stress area, that affects UAV using life and safety .But repair method is good or bad directly affects size of the high stress area. Based on finite element method, the broken hole repairing method was formulated and validated by ANSYS. The method could minimize the high stress area as far as possible, and economically repair broken hole of wing in certain precision and safety standards condition. It has a certain reference value for UAV repair and management, and has reference significance for extending the service life of the UAV. Key words: Finite element method; Unmanned Aerial Vehicle (UAV); Simulation; Hole of wings

Design of Virtual Prototype for Cold Roll Forming Machine of Side Panel of Engineering Vehicles and Numerical Simulation of the Forming Process

2013 ◽  
Vol 753-755 ◽  
pp. 159-162
Author(s):  
Qiu Bo Huang ◽  
Jun Rui Song ◽  
Qing Bo Yang
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Reference Value ◽  
Roll Forming ◽  
Cold Roll Forming ◽  
Forming Process ◽  
Side Plate ◽  
Pass System ◽  
Cold Roll ◽  
Solid Works

In this paper, based on the engineering vehicle’s side plate cold roll forming machine developed by a company, we use 3D solid modeling software Solid Works to complete the establishment of a 3D model. On the basis of explicit dynamics elastoplastic finite element method basic theory, we make numerical simulation analysis of the metal plate’s forming process by using ANSYS/LS-DYNA module. According to the simulation results, we make repeated adjustment and optimization on its pass system and parameters. Through the numerical simulation of the forming process, we conclude the stress-strain distribution of the sheet metal. For similar products, the result has a certain reference value to the research of cold roll forming process and the design of cold roll forming equipments.

Numerical Simulation of Gas-Liquid Tow-Phase Flow During Complex Mold Filling Process

2012 ◽  
Vol 591-593 ◽  
pp. 631-634
Author(s):  
Jun Ming Feng ◽  
Fan Jiang
Keyword(s):  
Numerical Simulation ◽  
Molten Aluminum ◽  
Simulation Analysis ◽  
Die Casting ◽  
Great Influence ◽  
Casting Process ◽  
Filling Process ◽  
Analysis Technique ◽  
Molten Aluminum Alloy ◽  
Complex Casting

In order to predict defects of a complex casting that may arise during the die casting, The numerical analysis technique of Fluent' s VOF was used to establish the filling model. Based on the case of the wheel, it is expounded that the numerical simulation of VOF was utilized in application of casting. The five groups of simulation analysis were performed under the different pouring pressure. At last the pouring pressure has a great influence on the state of filling and the filling times are little difference. The research on pouring pressure and flow field during the casting process of wheels was conducted. The results of the study show that, when the pouring pressure is about 60000 KPa, the cavity is completely filled with the molten aluminum alloy.

Construction Numerical Simulation of Cable-Supported Barrel Shell Structure Considering Construction Nonlinearity

2014 ◽  
Vol 548-549 ◽  
pp. 1748-1752
Author(s):  
Jia Li ◽  
Jing Hai Yu ◽  
Xiang Yu Yan ◽  
Hong Bo Liu
Keyword(s):  
Numerical Simulation ◽  
Shell Structure ◽  
Simulation Analysis ◽  
Mutual Influence ◽  
Reference Value ◽  
Construction Process ◽  
Analysis Method ◽  
Nonlinear Simulation ◽  
Similar Construction ◽  
Structure Layout

Based on an actual construction process, this paper put forward a nonlinear simulation analysis method, which can take the mutual influence between structural forming and the tensioning of the active-cables into account. The proposed method shows good performance in solving the problem of structure layout finding and the pre-stress calculation of pre-tensioning tendons by stages and in group. The method has clear mechanical conception and is of reference value for similar construction analysis.

Numerical Simulation Analysis on Buckling Load of Large Combined Cylindrical Shells

2008 ◽  
Author(s):  
Zhiping Chen ◽  
Ming Zeng ◽  
Chu-Lin Yu ◽  
Jinping Zhu
Keyword(s):  
Numerical Simulation ◽  
Hoop Stress ◽  
Simulation Analysis ◽  
Cylindrical Shells ◽  
Great Influence ◽  
Buckling Load ◽  
Critical Buckling Load ◽  
Buckling Behavior ◽  
The Difference ◽  
Almost All

To comply with the uniform-strength theory, almost all large tanks are made by welding unequal-thickness cylindrical shell courses together. This structure can be considered as a kind of geometry imperfection of tank walls, which has a great influence on buckling behavior and critical load of tank walls. To obtain the related critical buckling load and to verify the effect regularity on bulking due to hoop stress in various combined unequal-thickness cylindrical shells, the numerical simulation was adopted to analyze the buckling behavior with different loads. The results show that the characteristic factors of unequal-thickness structure can reduce the critical buckling load significantly, such factors as shell layers and the difference in thickness of adjacent shell courses are the most dominant.

scholarly journals Numerical Simulation Analysis of Flow and Heat Transfer in Medium Temperature Boiler

2021 ◽  
Vol 2101 (1) ◽  
pp. 012003
Author(s):  
Na Sun ◽  
Hexu Yang
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Waste Heat ◽  
Structural Parameters ◽  
Great Influence ◽  
Industrial Process ◽  
Metallurgical Industry ◽  
Simulation Method ◽  
Waste Heat Boiler ◽  
Medium Temperature

Abstract Waste heat recovery by waste heat boiler is one of the important means to utilize secondary energy, which is widely used in metallurgical industry. However, due to the great influence of production technology and other factors in industrial process, it brings many difficulties to waste heat utilization. Based on the structural parameters and operating parameters of the waste heat boiler, combined with the basic principles of fluid mechanics, the numerical calculation model of the waste heat boiler is established. The flow field and temperature field inside the waste heat boiler are studied and analyzed by numerical simulation method, which provides the necessary basis for its structural optimization.

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