Evaluation of the friction coefficient in tube hydroforming with the “corner filling test” in a square section die

2016 ◽  
Vol 88 (5-8) ◽  
pp. 2265-2273 ◽  
Author(s):  
Abir Abdelkefi ◽  
Pierrick Malécot ◽  
Nathalie Boudeau ◽  
Noamen Guermazi ◽  
Nader Haddar
Keyword(s):  
Friction Coefficient ◽  
Tube Hydroforming ◽  
Corner Filling

scholarly journals On the Friction Effect on the Characteristics of Hydroformed Tube in a Square Section Die: Analytical, Numerical and Experimental Approaches

2015 ◽  
Vol 639 ◽  
pp. 83-90 ◽  
Author(s):  
Abir Abdelkefi ◽  
Nathalie Boudeau ◽  
Pierrick Malecot ◽  
Gérard Michel ◽  
Noamen Guermazi
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Thickness Distribution ◽  
Tube Hydroforming ◽  
Friction Condition ◽  
Minimal Thickness ◽  
Straight Wall ◽  
Experimental Approaches ◽  
Hydroformed Tube ◽  
Corner Filling

A focus on the effect of friction condition on tube hydroforming during corner filling in a square section die is proposed. Three approaches have been developed: an analytical model from the literature has been programmed, finite element simulations have been conducted and experiments have been carried out. Effect of friction coefficient on the thickness distribution in the square section of the hydroformed tube is studied. Critical thinning is found to take place in the transition zone between the straight wall and the corner radius and this minimal thickness seems to be the more appropriate parameter for the evaluation of the friction coefficient.

Investigation of thickness variation and corner filling in tube hydroforming

2003 ◽  
Vol 133 (3) ◽  
pp. 287-296 ◽  
Author(s):  
G.T. Kridli ◽  
L. Bao ◽  
P.K. Mallick ◽  
Y. Tian
Keyword(s):  
Tube Hydroforming ◽  
Thickness Variation ◽  
Corner Filling

Numerical Inverse Method for Friction Coefficient Estimation in Tube Hydroforming

2011 ◽  
Vol 473 ◽  
pp. 548-555 ◽  
Author(s):  
Antonio Fiorentino ◽  
Roberto Marzi ◽  
Elisabetta Ceretti ◽  
Claudio Giardini
Keyword(s):  
Friction Coefficient ◽  
Inverse Method ◽  
Thickness Distribution ◽  
Influencing Factor ◽  
Tube Hydroforming ◽  
Process Conditions ◽  
Final Thickness ◽  
Novel Approach ◽  
Definition Of ◽  
The Right

Friction plays an important role in forming processes, in fact it influences the material flow and therefore it affects the process and part characteristics. In particular, friction is a very influencing factor in Tube Hydroforming (THF), where high die-part contact pressure and area make the material sliding very difficult. As a consequence, the material hardly flows to the expansion zones and the part formability can be compromised. To obtain sound parts, FEM models allow to study the process and optimize its parameters, but they require the right definition of the friction at tube-die interface. For these reasons, friction represents a key-point in THF processes and its knowledge and prediction are very important even if, nowadays, a comprehensive friction test for THF is not available in literature. With this paper, the Authors want to propose a novel approach to estimate friction for THF processes. In particular it will be described a numerical inverse method that allows to estimate the Coulombian friction coefficient combining experimental test and FE simulation results. The method is based on the effects of friction on the tube final thickness distribution when it is pressurized and compressed by two punches under different lubrication conditions without expansion. In particular, it will be shown how the use of few and fast FE simulations allows to estimate an analytical function that takes into account the process conditions and that can be used in combination with experimental results in order to estimate the friction coefficient in THF processes.

Investigation of Die Corner Filling in Hydroforming of Cylindrical Stepped Tubes Using Finite Element Simulation and Experiment

2009 ◽  
Vol 410-411 ◽  
pp. 335-343
Author(s):  
Mohammad Bakhshi-Jooybari ◽  
Majid Elyasi ◽  
A. Gorji ◽  
G. Mohammad-Alinejad ◽  
S.J. Hosseinipour ◽  
...  
Keyword(s):  
Material Flow ◽  
Tube Hydroforming ◽  
Fem Simulation ◽  
Complete Filling ◽  
Element Simulation ◽  
Hydroforming Process ◽  
Simulation And Experiment ◽  
Simulation Results ◽  
Corner Filling ◽  
Tubular Components

Seamless tubular components, such as stepped tubes, conical tubes and box shape tubes, are mainly produced in tube hydroforming process. In forming the components in this process, complete filling the die corners is very difficult. In this paper, the mechanism of improvement of die corner filling in a proposed tube hydroforming die was investigated. The FEM simulation results showed that the material flow and stress distribution could theoretically clarify the die corner filling in the proposed die. Also, the comparison of the die corner filling between the new die and a conventional die was explained. In order to verify the simulation results, some experiments were performed.

Measurement Methods of Friction Coefficient for Plastic Deformation of Metals under High Strain Rate

2016 ◽  
Vol 878 ◽  
pp. 127-131 ◽  
Author(s):  
Jian Ping Ma ◽  
Lian Fa Yang
Keyword(s):  
Plastic Deformation ◽  
Friction Coefficient ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Tube Hydroforming ◽  
Measurement Methods ◽  
The Future

This paper introduces some representative measurement methods of friction coefficient for plastic deformation of metals under high strain rate both in our country and abroad in recent years, and mainly includes several measurement methods of friction coefficient based on the upsetting, forging, extrusion and tube hydroforming. Furthermore, the working principles, applicable occasions and technical characteristics of these methods are explained, and the development of these methods in the future are presented.

Study of Localized Thinning of Copper Tube Hydroforming in Square Section Die: Effect of Friction Conditions

2015 ◽  
Vol 651-653 ◽  
pp. 65-70 ◽  
Author(s):  
Abir Abdelkefi ◽  
Nathalie Boudeau ◽  
Pierrick Malecot ◽  
Noamen Guermazi ◽  
Gérard Michel
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Analytical Model ◽  
Thickness Distribution ◽  
Tube Hydroforming ◽  
Analytical Models ◽  
Specific Test ◽  
Good Evaluation ◽  
Shaped Tube ◽  
Tube Expansion

The friction conditions are responsible of the thickness distribution in a part realized by tube hydroforming. Then it is essential to have a good evaluation of the friction coefficient for running predictive finite element simulations. The tube expansion in a square die is one of tests proposed for the friction evaluation. In the literature, several analytical models have been developed for this specific test. The present paper concentrates on one of this model and results obtained from the analytical analysis, FE simulations and experiments are compared. The repartition of the thickness over the shaped tube and its evolution during the process are studied. The tendencies are in agreement but some complementary evaluations are proposed for using the proposed approach for the evaluation of the friction coefficient with the analytical model.

Experimental investigation of friction coefficient in tube hydroforming

2011 ◽  
Vol 21 ◽  
pp. s194-s198 ◽  
Author(s):  
Hyae Kyung YI ◽  
Hong Sup YIM ◽  
Gun Yeop LEE ◽  
Sung Mun LEE ◽  
Gi Suk CHUNG ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Friction Coefficient ◽  
Tube Hydroforming

Investigation of Modified Bi-Layered Tube Hydroforming by Pulsating Pressure

2011 ◽  
Vol 486 ◽  
pp. 5-8 ◽  
Author(s):  
Mohsen Loh-Mousavi ◽  
Amir Masoud Mirhosseini ◽  
Ghasem Amirian
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Internal Pressure ◽  
Tube Hydroforming ◽  
Three Dimensional ◽  
Key Factor ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Corner Filling

In recent years, tube hydroforming has been applied in automobile and airplane industries, to decrease weight. In general, the determination of internal pressure path is a key factor in improving the formability in tube hydroforming. One of the effective methods in improving the tube hydroforming is using the pulsating internal pressure path. In this research, hydroforming of bi-layered tubes under pulsating pressure in x-shaped die is simulated by means of three dimensional finite element method. Some numerical results were compared with experimental results and show good correlation. Influence of pulsating pressure on the thickness and stress distribution have been also studied. It was shown that pulsating pressure improves the formability in hydroforming of bi-layered tubes via continues and gradual removing returnable wrinkling which is caused by a low pressure in this process. In addition, effect of some key parameters such as friction and die corner filling have been investigated.

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