Journal ArticleDOI
Determination of flow stress of thin-walled tube based on digital speckle correlation method for hydroforming applications.
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TLDR
In this article, a novel approach of online measurement based on digital speckle correlation method is put forward to determine flow stress of thin-walled tube, a simple experimental tooling is developed and free-bulged tests are performed for 304 stainless steel and H62 brass alloy tubes.Abstract:
The flow stress, used to describe the plastic deformation behavior of thin-walled tube, is one of the most important parameters to ensure reliable finite element simulation in the tube hydroforming process. In this study, a novel approach of on-line measurement based on digital speckle correlation method is put forward to determine flow stress of thin-walled tube. A simple experimental tooling is developed and free-bulged tests are performed for 304 stainless steel and H62 brass alloy tubes. An analytical approach is proposed according to the membrane theory and the force equilibrium equation. The developed method is validated by means of FE simulations. The results indicate that the present method is acceptable to define the flow stress in the tube hydroforming process.read more
Citations
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Journal ArticleDOI
Mechanical characterization and constitutive parameter identification of anisotropic tubular materials for hydroforming applications
Ali Khalfallah,Ali Khalfallah,Marta Oliveira,José Alves,Temim Zribi,Hedi Belhadjsalah,Luís Menezes +6 more
TL;DR: In this paper, the authors identify the constitutive parameters of anisotropic tubular materials and verify the accuracy of models' prediction based on information obtained from tensile tests, performed on samples cut from the tubes, and from the free tubular bulge test, using a home-developed bulge forming machine.
Journal ArticleDOI
Determination of mechanical properties of anisotropic thin-walled tubes under three-dimensional stress state
TL;DR: In this paper, an analytical model for stress component calculation for fixed-end tube under internal and external pressures was proposed to investigate the mechanical properties of anisotropic thin-walled tubes under three-dimensional stress state.
Journal ArticleDOI
Cryogenic deformation behavior of 6061 aluminum alloy tube under biaxial tension condition
TL;DR: In this article , a novel cryogenic hydro-bulging device was established to evaluate cryogenic deformation behavior and verify the feasibility of the new forming process, and the obtained cryogenic biaxial flow curve exhibits the significantly improved plasticity and hardening ability with a strain hardening exponent of 0.43.
Journal ArticleDOI
Constitutive parameter identification of CB2001 yield function and its experimental verification using tube hydroforming tests
TL;DR: In this paper, the use of tube hydroforming into square cross-sectional-die as validation test for new constitutive parameter identification strategy is presented, where a developed identification startegy using a reduced set of experimental data in conjuction with some generated artificiel input data are proficient to identifiy the anisotropy parameters of an advanced Cazacu & Barlat yield criterion CB2001.
Journal ArticleDOI
Investigation of tube hydroforming along with stamping of thin-walled tubes in square cross-section dies
TL;DR: In this article, a compound forming technology of thin-walled tube using stamping and hydroforming processes was presented to cut forming costs, reduce numbe... and reduce the number of tubes to be formed.
References
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Journal ArticleDOI
Optimizing tube hydroforming using process simulation and experimental verification
TL;DR: In this paper, a finite element (FE)-based simulation was used to determine optimum loading paths for tube hydroforming of structural parts with different tubular materials, and the test results showed that the reliability of the FE-based loading paths is highly dependent on the accuracy of the material properties of the blank, interface friction, and how close the properties of welding zone are to the base material of the tubular blank.
Journal ArticleDOI
An experimental study on the comparative assessment of hydraulic bulge test analysis methods
TL;DR: In this article, different approaches for the analysis of hydraulic bulge were compared with experimental results to determine the best combination in obtaining accurate flow curves models at room and elevated temperature conditions for different lightweight materials of interest for several industrial applications.
Journal ArticleDOI
On the characteristics of tubular materials for hydroforming—experimentation and analysis
TL;DR: In this article, the characterization and specification of tubular material properties under hydroforming conditions is the main concern of this paper, and analytical improvements and their comparison with experimental findings on measurement of material properties of tubes under hydraulic bulging conditions are explained.
Journal ArticleDOI
Tube hydroforming process: A reference guide
TL;DR: In this article, an overall review of tube hydroforming studies is presented so that other researchers at different parts of the world can use it for further investigations in this area, and a guideline for employing finite element modeling (FEM) in the process analysis is proposed.
Journal ArticleDOI
Analysis and finite element simulation of the tube bulge hydroforming process
Yeong-Maw Hwang,Yi-Kai Lin +1 more
TL;DR: In this paper, a mathematical model considering the forming tube by an ellipsoidal surface is proposed to examine the plastic deformation behavior of a thin-walled tube during the bulge hydroforming process in an open die.
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