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

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.

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 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.

Some Quantification Problems in Parallel EELS Images

1990 ◽  
Vol 48 (2) ◽  
pp. 36-37
Author(s):  
G. Botton ◽  
G. L’Espérance ◽  
M.D. Ball ◽  
C.E. Gallerneault
Keyword(s):  
Electron Microscope ◽  
Imaging System ◽  
Signal To Noise Ratio ◽  
Scanning Transmission Electron Microscope ◽  
Acquisition Time ◽  
Thickness Variation ◽  
Transmission Electron ◽  
Distribution Of Elements ◽  
Scanning Transmission ◽  
Present Distribution

The recently developed parallel electron energy loss spectrometers (PEELS) have led to a significant reduction in spectrum acquisition time making EELS more useful in many applications in material science. Dwell times as short as 50 msec per spectrum with a PEELS coupled to a scanning transmission electron microscope (STEM), can make quantitative EEL images accessible. These images would present distribution of elements with the high spatial resolution inherent to EELS. The aim of this paper is to briefly investigate the effect of acquisition time per pixel on the signal to noise ratio (SNR), the effect of thickness variation and crystallography and finally the energy stability of spectra when acquired in the scanning mode during long periods of time.The configuration of the imaging system is the following: a Gatan PEELS is coupled to a CM30 (TEM/STEM) electron microscope, the control of the spectrometer and microscope is performed through a LINK AN10-85S MCA which is interfaced to a IBM RT 125 (running under AIX) via a DR11W line.

Formulation and Evaluation of Fast Disintigrating Meloxicam Tablets and Its Comparison with Marketed Product

2010 ◽  
Vol 2 (2) ◽  
Author(s):  
Suresh Kulkarni ◽  
Ranjit P. ◽  
Nikunj Patel ◽  
Someshwara B. ◽  
Ramesh B. ◽  
...  
Keyword(s):  
Water Absorption ◽  
In Vitro Dissolution ◽  
Thickness Variation ◽  
Wet Granulation ◽  
Disintegration Time ◽  
Absorption Ratio ◽  
Wetting Time ◽  
Fast Disintegrating Tablets ◽  
Cox 1

The present investigation deals with the formulation of fast disintegrating tablets of Meloxicam that disintegrate in the oral cavity upon contact with saliva and there by improve therapeutic efficacy. Meloxicam is a newer selective COX-1 inhibitor. The tablets were prepared by wet granulation procedure. The influence of superdisintegrants, crosspovidone, croscaremellose sodium on disintegration time, wetting time and water absorption ratio were studied. Tablets were evaluated for weight and thickness variation, disintegration time, drug content, in vitro dissolution, wetting time and water absorption ratio. The in vitro disintegration time of the best fast disintegrating tablets was found to be 18 sec. Tablets containing crospovidone exhibit quick disintegration time than tablets containing croscaremellose sodium. The fast disintegrating tablets of Meloxicam with shorter disintegration time, acceptable taste and sufficient hardness could be prepared using crospovidone and other excipients at optimum concentration.

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