The Experts below are selected from a list of 1161 Experts worldwide ranked by ideXlab platform
Mahmoud Mosavi Mashhadi - One of the best experts on this subject based on the ideXlab platform.
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Finite element simulation and experiment in tube hydroforming of unequal T shapes
Journal of Materials Processing Technology, 2006Co-Authors: Hossein Kashani Zadeh, Mahmoud Mosavi MashhadiAbstract:Abstract Tube hydroforming of unequal T joints was simulated with finite element method. The code ABAQUS/EXPLICIT 6.3-1 was used and the effects of the coefficient of friction, strain hardening exponent and Fillet Radius on the parameters, protrusion height, thickness distribution and clamping and axial forces were studied. Curves for clamping and axial forces are very useful for estimation of the capacity for the press and hydraulic jacks. Also loading paths for different branch diameters have been determined. The amounts of calibration pressures and axial feedings required to produce an acceptable product in FEM were compared to experimental results and it was shown that there is a good agreement. Therefore, FEM can be used as a reliable tool in design of tube hydroforming processes and reduction of the number of costly trials.
M Dumas - One of the best experts on this subject based on the ideXlab platform.
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turning induced surface integrity for a Fillet Radius in a 316l austenitic stainless steel
Journal of Manufacturing Processes, 2021Co-Authors: M Dumas, Frederic Valiorgue, Guillaume Kermouche, A Van Robaeys, Alexandre Brosse, Habib Karaouni, Fabien Lefebvre, Joel RechAbstract:Abstract Turning is a machining process extensively applied to produce revolution parts. Durability of these parts are known to depend on the turning process signature that is often referred as surface integrity. The surface integrity generated in a Fillet Radius has been barely studied in the literature so far, despite the well-known geometrical stress concentration factor of such singularities. Therefore this paper deals with the investigation of machining-induced surface integrity when turning a Fillet Radius in a 316L austenitic stainless steel. Different characterization methods are used for that purpose - SEM, EBSD, nanoindentation and X-Ray diffraction. It points out that the turning-induced consequences are not homogeneous along the machined profile. Residual stresses are strongly affected and microstructure is highly modified over a depth of 80 μm that leads to a mechanical properties gradient. It is evidenced that the average uncut chip thickness is the main governing parameter regarding surface integrity. It is also reported that deformation twins appear in the affected zone. It highlights that turning-induced microstructure evolution at a given depth is rather a consequence of severe plastic deformation at high strain rate than dynamic recrystallization.
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evolution of the surface integrity while turning a Fillet Radius in a martensitic stainless steel 15 5ph
Procedia CIRP, 2020Co-Authors: M Dumas, Frederic Valiorgue, Guillaume Kermouche, A Van Robaeys, U Masciantonio, Alexandre Brosse, Habib Karaouni, Joel RechAbstract:Abstract Surface integrity induced by longitudinal turning has been widely investigated in the literature. On the contrary, few works have aimed at investigating the surface integrity induced during turning of geometric singularities such as Fillet radii. This paper investigates the surface integrity generated while turning a Fillet Radius in a martensitic stainless steel (15-5PH). The induced residual stresses, microstructure and mechanical properties have been characterized. Then, a geometrical analysis has revealed that the chip removal mechanisms vary continuously along the Fillet Radius, which, as a consequence, modify the cutting phenomena responsible of surface integrity modifications along the Fillet Radius. The study has highlighted that the microstructure remained stable but the residual stresses profiles differed especially regarding the compression peak intensity and the affected depth.
Stefanie M. Hirt - One of the best experts on this subject based on the ideXlab platform.
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experimental study of Fillets to reduce corner effects in an oblique shock wave boundary layer interaction
53rd AIAA Aerospace Sciences Meeting, 2015Co-Authors: Stefanie M. HirtAbstract:A test was conducted in the 15 cm x 15 cm supersonic wind tunnel at NASA Glenn Research Center that focused on corner effects of an oblique shock-wave/boundary-layer interaction. In an attempt to control the interaction in the corner region, eight corner Fillet configurations were tested. Three parameters were considered for the Fillet configurations: the Radius, the Fillet length, and the taper length from the square corner to the Fillet Radius. Fillets effectively reduced the boundary-layer thickness in the corner; however, there was an associated penalty in the form of increased boundary-layer thickness at the tunnel centerline. Larger Fillet radii caused greater reductions in boundary-layer thickness along the corner bisector. To a lesser, but measureable, extent, shorter Fillet lengths resulted in thinner corner boundary layers. Overall, of the configurations tested, the largest Radius resulted in the best combination of control in the corner, evidenced by a reduction in boundary-layer thickness, coupled with minimal impacts at the tunnel centerline.
Yufeng Zheng - One of the best experts on this subject based on the ideXlab platform.
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new formulas of shear strain during equal channel angular pressing process with consideration of influences of velocity and motion trajectory
Journal of Iron and Steel Research International, 2016Co-Authors: Diantao Zhang, L I Zhen, Y X Tong, Yufeng ZhengAbstract:The influences of die parameters on shear strain were investigated by using two-dimensional finite element simulation. New formulas of shear strain were proposed. According to the results of formulas, the shear strain showed a linear dependence on the difference between internal and external Fillet Radius and the slope was determined by the intersection angle. The simulation results indicated that the velocities of the points from different zones were different in the specimen and the motion trajectories of different points did not follow geometrical laws. The influences of the average velocity and the motion trajectory on shear strain were incorporated in the formula to calculate the shear strain produced during equalchannel angular pressing process. The reliability of simulation results has been partially validated by experiments.
Joel Rech - One of the best experts on this subject based on the ideXlab platform.
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turning induced surface integrity for a Fillet Radius in a 316l austenitic stainless steel
Journal of Manufacturing Processes, 2021Co-Authors: M Dumas, Frederic Valiorgue, Guillaume Kermouche, A Van Robaeys, Alexandre Brosse, Habib Karaouni, Fabien Lefebvre, Joel RechAbstract:Abstract Turning is a machining process extensively applied to produce revolution parts. Durability of these parts are known to depend on the turning process signature that is often referred as surface integrity. The surface integrity generated in a Fillet Radius has been barely studied in the literature so far, despite the well-known geometrical stress concentration factor of such singularities. Therefore this paper deals with the investigation of machining-induced surface integrity when turning a Fillet Radius in a 316L austenitic stainless steel. Different characterization methods are used for that purpose - SEM, EBSD, nanoindentation and X-Ray diffraction. It points out that the turning-induced consequences are not homogeneous along the machined profile. Residual stresses are strongly affected and microstructure is highly modified over a depth of 80 μm that leads to a mechanical properties gradient. It is evidenced that the average uncut chip thickness is the main governing parameter regarding surface integrity. It is also reported that deformation twins appear in the affected zone. It highlights that turning-induced microstructure evolution at a given depth is rather a consequence of severe plastic deformation at high strain rate than dynamic recrystallization.
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evolution of the surface integrity while turning a Fillet Radius in a martensitic stainless steel 15 5ph
Procedia CIRP, 2020Co-Authors: M Dumas, Frederic Valiorgue, Guillaume Kermouche, A Van Robaeys, U Masciantonio, Alexandre Brosse, Habib Karaouni, Joel RechAbstract:Abstract Surface integrity induced by longitudinal turning has been widely investigated in the literature. On the contrary, few works have aimed at investigating the surface integrity induced during turning of geometric singularities such as Fillet radii. This paper investigates the surface integrity generated while turning a Fillet Radius in a martensitic stainless steel (15-5PH). The induced residual stresses, microstructure and mechanical properties have been characterized. Then, a geometrical analysis has revealed that the chip removal mechanisms vary continuously along the Fillet Radius, which, as a consequence, modify the cutting phenomena responsible of surface integrity modifications along the Fillet Radius. The study has highlighted that the microstructure remained stable but the residual stresses profiles differed especially regarding the compression peak intensity and the affected depth.