Simulation and Springback Prediction of Integral Panel with High Ribs in Age Forming

2012 ◽  
Vol 152-154 ◽  
pp. 135-139
Author(s):  
Zhong Gan ◽  
Hai Bing Tan ◽  
Jia Zan Zhu
Keyword(s):  
Numerical Simulation ◽  
Constitutive Equation ◽  
Test Data ◽  
Creep Test ◽  
Material Parameter ◽  
High Strength ◽  
Accurate Prediction ◽  
Forming Simulation ◽  
Springback Prediction ◽  
Test Result

Age forming is the best forming method of integral panel parts of aircrafts, which have large amount of springback and the springback’s accuracy, is hard to control, so a method which can make an accurate prediction of the springback after forming is needed. This article which is based on creep test data and CPT, fits the creep constitutive equation and obtained the material parameter. The numerical simulation is adopted to process age forming simulation on springback of T-specimen of aluminum 2124, and the simulation result is compared with the test result to do revision of the material parameter; the revised material parameter is applied into the numerical simulation of age forming of the integral panel which is of high strength. Through tests which can confirm the error ranges from -1mm to +1mm, this method’s accuracy is proved.

scholarly journals The Research and Development of Safety Forewarning Composite Integral Strong Geocell

2015 ◽  
Vol 9 (1) ◽  
pp. 139-145
Author(s):  
Wang Qingbiao ◽  
Zhang Cong ◽  
Wen Xiaokang ◽  
Lü Rongshan ◽  
Xu Lei ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Yield Strength ◽  
Creep Test ◽  
Optimization Technique ◽  
High Strength ◽  
Economic Benefits ◽  
Tensile Yield Strength ◽  
Fiber Technology ◽  
New Type ◽  
The Relationship

In this paper, we have studied the high strength geocell development technology route, analyzed the rules of the tensile properties and creep properties of geocell, and established the relationship between elongation of stress and time, thus providing theoretical foundation for the development and engineering application of the new material. Through theoretical analysis, experimental research and numerical simulation, the characteristics, raw materials and craftsmanship of the geocell have been studied. The research is given on its stress and deformation rules based on elongation test and creep test. The rationality of the experiment is verified through numerical simulation and the conclusions are as follows: (1) With the research on the geocell traditional craftsmanship, combined with new technologies such as special ultrasonic welding technology, intelligent optical fiber technology and fixed locking plate technology, a new-type of safety forewarning high strength geocell can be developed. (2) Based on the geocell material characteristics, the elongation test and creep test are carried out and the tensile yield strength exceeds 250Mpa; the joint is welded by special crafts and the tensile strength ≥2000N/cm. (3) With FLAC3D numerical simulation, simulation study is performed on the mechanical properties of the new cell. Through analyzing the relationship between stress and strain, and time and displacement, the safety design and management construction of the new-type of geocell was proposed based on the actual situation of simulation. (4) The innovation points of the new-type of geocell include: the optimization technique of whole tensile yield strength, fall proof technique of lock parts, and positioning and effective monitoring technique, which effectively solves the geological problems of special projects such as ecological afforestation, sand fixation and high slope soft subgrade, and ensures the quality of the project and has high economic benefits.

Material Modeling and Correlative Mechanical Testing on AHSS Sheet Forming Simulation

2011 ◽  
Vol 337 ◽  
pp. 198-202
Author(s):  
Ke Chen ◽  
Jian Ping Lin
Keyword(s):  
Constitutive Models ◽  
High Strength ◽  
Mechanical Tests ◽  
Sheet Forming ◽  
Material Behavior ◽  
Test Procedures ◽  
Yield Model ◽  
Simulation Accuracy ◽  
Forming Simulation ◽  
Springback Prediction

The finite element method is widely used to numerically simulate sheet forming processes. The increasing use of advanced high strength steel (AHSS) sheet places an increased demand on accuracy of forming simulation and springback prediction. Appropriate identification and characterization of material behavior are of vital importance to improve the simulation accuracy. An overview of yield criteria and hardening laws of material constitutive models are presented in this work. Because of the anisotropic yield behavior and Bauschinger effect of AHSS sheet materials, suitable anisotropic yield model in combination with anisotropic hardening law is one essential component for successful AHSS sheet forming simulation and springback prediction. Necessary mechanical tests for determination of parameters of material constitutive models are given in this paper, the advantages and already known limitations of different test procedures are also discussed. Recommendations on choose or further improve the constitutive models are given for enhance the efficiency and accuracy of AHSS sheet forming simulation.

scholarly journals Numerical Prediction and Reduction of Hat-Shaped Part Springback Made of Dual-Phase AHSS Steel

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1119
Author(s):  
Peter Mulidrán ◽  
Emil Spišák ◽  
Miroslav Tomáš ◽  
Ján Slota ◽  
Janka Majerníková
Keyword(s):  
Numerical Simulation ◽  
High Strength ◽  
Numerical Prediction ◽  
Dual Phase ◽  
Forming Process ◽  
Numerical Predictions ◽  
Shaped Part ◽  
Metal Forming Process ◽  
Springback Prediction ◽  
Ahss Steel

The springback in the sheet metal forming process refers to the change of shape after the load removal. It is usually undesirable, causing problems in the subsequent forming operations, in the assembly and negatively affects the quality of the final product. Numerical prediction of the springback with the use of the numerical simulation is crucial for the reduction of forming tool try-outs, reducing manufacturing costs and increasing the accuracy of the stamped part. In this work, numerical simulation was used for the springback prediction of the hat-shaped part made of advanced high-strength dual-phase steel HCT600X+Z. These numerical predictions were performed with the use of various combinations of material models to try to improve the prediction results. Furthermore, this work includes the proposed springback reduction measure. The reduction of the springback was achieved by the tool design which includes a counterpunch. The springback analysis was carried out in the side view of the formed part; the springback prediction results were compared with the experimental values.

scholarly journals Study on the viscoelastic–viscoplastic model of layered siltstone using creep test and RBF neural network

2021 ◽  
Vol 13 (1) ◽  
pp. 72-84
Author(s):  
Yiran Yang ◽  
Xingping Lai ◽  
Tao Luo ◽  
Kekuo Yuan ◽  
Feng Cui
Keyword(s):  
Neural Network ◽  
Numerical Simulation ◽  
Relative Error ◽  
Test Data ◽  
Creep Test ◽  
Rbf Neural Network ◽  
Creep Property ◽  
Creep Tests ◽  
Viscoplastic Model ◽  
Mean Relative Error

Abstract Creep is a fundamental time-dependent property of rock. As one of the main surrounding rocks of underground engineering, layered siltstone is governed by creep to a great extent because of special structure. Based on the structural characteristics of layered siltstone, a viscoelastic–viscoplastic model was proposed to simulate and present its creep property. To verify the accuracy of the model, governing equation of the viscoelastic–viscoplastic model was introduced into finite element difference program to simulate a series of creep tests of layered siltstone. Meanwhile, creep tests on layered siltstone were conducted. Numerical simulation results of the viscoelastic–viscoplastic model were compared with creep test data. Mean relative error of creep test data and numerical simulation result was 0.41%. Combined with Lyapunov function, the radial basis function (RBF) neural network trained with creep test data was adopted. Mean relative error of creep test data and RBF neural network data was 0.57%. The results further showed high accuracy and stability of RBF neural network and the viscoelastic–viscoplastic model.

scholarly journals Numerical simulation of laser-arc hybrid welding of high strength steel

2020 ◽  
Vol 1676 ◽  
pp. 012162
Author(s):  
ZHANG Fulong ◽  
ZHANG Hong ◽  
LIU Shuangyu ◽  
LIU Fengde
Keyword(s):  
Numerical Simulation ◽  
High Strength Steel ◽  
High Strength ◽  
Hybrid Welding

Design of Road Test and Evaluation System for Vehicle Handling and Stability

2014 ◽  
Vol 505-506 ◽  
pp. 281-285
Author(s):  
Ming Qiu Gao ◽  
Run Qing Guo ◽  
Rong Liang Liang
Keyword(s):  
Data Processing ◽  
Test Data ◽  
Evaluation System ◽  
Test System ◽  
Stability Test ◽  
Road Test ◽  
Vehicle Handling ◽  
Test And Evaluation ◽  
Test Result

Vehicle handling and stability has effect on positive safety of automotive directly. Test system of handling and stability is built for its road test and the test variables signal can be acquired and stored synchronously. Based on MATLAB GUI, software is developed for the test data processing, so that the stored data is to be analyzed and handling and stability test result is given by the software automatically. Using the test system in paper, handling and stability road test of one domestic sedan is fulfilled and scored, which verifies the applicability of the test system and scoring software in paper.

Continuous Roll Forming Simulation Using Arbitrary Lagrangian Eulerian Formalism

2011 ◽  
Vol 473 ◽  
pp. 564-571 ◽  
Author(s):  
Romain Boman ◽  
Jean Philippe Ponthot
Keyword(s):  
Numerical Simulation ◽  
Rolling Direction ◽  
Initial Guess ◽  
Roll Forming ◽  
Arbitrary Lagrangian Eulerian ◽  
The Finite Element Method ◽  
Forming Simulation ◽  
Element Size ◽  
Cold Roll ◽  
Classical Lagrangian

Due to the length of the mill, accurate modelling of stationary solution of continuous cold roll forming by the finite element method using the classical Lagrangian formulation usually requires a very large mesh leading to huge CPU times. In order to model industrial forming lines including many tools in a reasonable time, the sheet has to be shortened or the element size has to be increased leading to inaccurate results. On top of this, applying loads and boundary conditions on this smaller sheet is usually more difficult than in the continuous case. Moreover, transient dynamic vibrations, which are unnecessarily computed, may appear when the sheet hits each tool, decreasing the convergence rate of the numerical simulation. Beside this classical Lagrangian approach, an alternative method is given by the Arbitrary Lagrangian Eulerian (ALE) formalism which consists in decoupling the motion of the material and the mesh. Starting from an initial guess of the sheet geometry between the rolls, the numerical simulation is performed until the stationary state is reached with a mesh, the nodes of which are fixed in the rolling direction but are free to move on perpendicular plane, following the geometrical boundary of the sheet. The whole forming line can then be modelled using a limited number of brick and contact elements because the mesh is only refined near the tools where bending and contact occur. In this paper, ALE results are compared to previous Lagrangian simulations and experimental measurement on a U-channel, including springback. Advantages of the ALE method are finally demonstrated by the simulation of a tubular rocker panel on a 16-stands forming mill.

Analysis of Thick-Walled Pipeline Elements Operating in Creep Conditions

2015 ◽  
Vol 712 ◽  
pp. 63-68
Author(s):  
Przemysław Osocha ◽  
Bohdan Węglowski
Keyword(s):  
Finite Element ◽  
Test Data ◽  
Creep Test ◽  
Power Plants ◽  
Steam Pressure ◽  
Creep Model ◽  
Creep Process ◽  
Fe Model ◽  
Element Analysis ◽  
Wide Range

In some coal-fired power plants, pipeline elements have worked for over 200 000 hours and increased number of failures is observed. The paper discuses thermal wear processes that take place in those elements and lead to rupture. Mathematical model based on creep test data, and describing creep processes for analyzed material, has been developed. Model has been verified for pipeline operating temperature, lower than tests temperature, basing on Larson-Miller relation. Prepared model has been used for thermal-strength calculations based on a finite element method. Processes taking place inside of element and leading to its failure has been described. Than, basing on prepared mathematical creep model and FE model introduced to Ansys program further researches are made. Analysis of dimensions and shape of pipe junction and its influence on operational element lifetime is presented. In the end multi variable dependence of temperature, steam pressure and element geometry is shown, allowing optimization of process parameters in function of required operational time or maximization of steam parameters. The article presents wide range of methods. The creep test data were recalculated for operational temperature using Larson-Miller parameter. The creep strain were modelled, used equations and their parameters are presented. Analysis of errors were conducted. Geometry of failing pipe junction was introduced to the Ansys program and the finite element analysis of creep process were conducted.

Numerical Simulation of Thermoplastic Composite Material by ANSYS

2011 ◽  
Vol 279 ◽  
pp. 181-185 ◽  
Author(s):  
Guo Hua Zhao ◽  
Qing Lian Shu ◽  
Bo Sheng Huang
Keyword(s):  
Numerical Simulation ◽  
Composite Material ◽  
Composite Structures ◽  
Material Model ◽  
General Purpose ◽  
Thermoplastic Composite ◽  
Finite Element Code ◽  
Peek Composite ◽  
Test Result ◽  
Good Agreement

This paper proposes a material model of AS4/PEEK, a typical thermoplastic composite material, for the general purpose finite element code—ANSYS, which can be used to predict the mechanical behavior of AS4/PEEK composite structures. The computational result using this model has a good agreement with the test result. This investigation can lay the foundation for the numerical simulation of thermoplastic composite structures.

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