The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Hongwu Zhang - One of the best experts on this subject based on the ideXlab platform.
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effect of traverse rotational speed on material deformations and Temperature distributions in friction stir welding
Journal of Materials Science & Technology, 2009Co-Authors: Z Zhang, Jun Bie, Yali Liu, Hongwu ZhangAbstract:A fully coupled thermo-mechanical model was developed to study the Temperature fields and the plastic deformations of alloy AL6061-T6 under different process parameters during the friction stir welding (FSW) process.Three-dimensional results under different process parameters were presented.Results indicate that the maximum Temperature is lower than the melting point of the welding material.The higher Temperature gradient occurs in the leading side of the workpiece.The Calculated Temperature field can be fitted well with the one from the experimental test.A lower plastic strain region can be found near the welding tool in the trailing side on the bottom surface,which is formed by the specific material flow patterns in FSW.The maximum Temperature can be increased with increasing the welding speed and the angular velocity in the current numerical modelling.
T Domanski - One of the best experts on this subject based on the ideXlab platform.
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numerical prediction of fusion zone and heat affected zone in hybrid yb yag laser gmaw welding process with experimental verification
Procedia Engineering, 2016Co-Authors: Marcin Kubiak, Wiesława Piekarska, Z Saternus, T DomanskiAbstract:Abstract This work concerns mathematical and numerical modelling of Temperature field during hybrid welding process using Yb:YAG laser and electric arc in GMAW method. Numerical analysis is performed taking into account the motion of liquid steel in the fusion zone. Yb:YAG laser power distribution is determined on the basis of experimental research made on TruDisk 12002 laser. Geostatistical Kriging method is used in the interpolation of Yb:YAG laser power intensity distribution. Temperature field and melted material velocity field in the fusion zone of hybrid welded sheets made of S355 steel are obtained on the basis of numerical solution of continuum mechanics equations in Chorin's projection method and finite volume method. Experimental research of laser beam profile is performed in order to verify the correctness of developed heat source model. Fusion zone and heat affected zone geometry is predicted on the basis of Calculated Temperature field in the cross section of hybrid welded joint.
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numerical prediction of fusion zone and heat affected zone in hybrid yb yag laser gmaw welding process with experimental verification
Procedia Engineering, 2016Co-Authors: Marcin Kubiak, Wiesława Piekarska, Z Saternus, T DomanskiAbstract:Abstract This work concerns mathematical and numerical modelling of Temperature field during hybrid welding process using Yb:YAG laser and electric arc in GMAW method. Numerical analysis is performed taking into account the motion of liquid steel in the fusion zone. Yb:YAG laser power distribution is determined on the basis of experimental research made on TruDisk 12002 laser. Geostatistical Kriging method is used in the interpolation of Yb:YAG laser power intensity distribution. Temperature field and melted material velocity field in the fusion zone of hybrid welded sheets made of S355 steel are obtained on the basis of numerical solution of continuum mechanics equations in Chorin's projection method and finite volume method. Experimental research of laser beam profile is performed in order to verify the correctness of developed heat source model. Fusion zone and heat affected zone geometry is predicted on the basis of Calculated Temperature field in the cross section of hybrid welded joint.
G H He - One of the best experts on this subject based on the ideXlab platform.
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thermal stress relaxation behavior in thin films under transient laser pulse heating
Journal of Applied Physics, 1993Co-Authors: D W Tang, B L Zhou, G H HeAbstract:Transient laser pulse has been used to generate nonsynchronous change of Temperature rise and thermal expansion in thin films. The transient process of thermal expansion is recorded by a photoelectric high‐speed acquisition system. By comparison of the Calculated Temperature rise and thermal expansion, thermal stress relaxation processes in Al films of 20–50 μm thickness is obtained. This result shows that, for transient heating, thermal stress exists even in the case of uniform Temperature distribution and free expansion. And also there is a transient high stress in thin films under high‐speed heating.
Z G Wang - One of the best experts on this subject based on the ideXlab platform.
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thermo mechanical aspects of adiabatic shear failure of am50 and ti6al4v alloys
Mechanics of Materials, 2008Co-Authors: D Rittel, Z G WangAbstract:Abstract The thermo-mechanical aspects of adiabatic shear band (ASB) formation are studied for two commercial alloys: Mg AM50 and Ti6Al4V. Tests are carried out on shear compression specimens (SCS). The evolution of the Temperature in the deforming gauge section is monitored in real-time, using an array of high-speed infrared detectors synchronized with a Kolsky apparatus (split Hopkinson pressure bar). The evolution of the gage Temperature is found to comprise three basic stages, in agreement with Marchand and Duffy’s simultaneous observations of mechanical data and gauge deformation patterns (1988). The onset and full formation stages of ASB are identified by combining the collected thermal and mechanical data. Full development of the ASB is identified as the point at which the measured and Calculated Temperature curves intersect and diverge thereon. At that stage, the homogeneous strain assumption used in calculating the maximum Temperature rise is no longer valid.
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thermo mechanical aspects of adiabatic shear failure of am50 and ti6al4v alloys
Volume 1: Advanced Energy Systems; Advanced and Digital Manufacturing; Advanced Materials; Aerospace, 2008Co-Authors: D Rittel, Z G WangAbstract:The thermo-mechanical aspects of adiabatic shear band (ASB) formation are studied for two commercial alloys: Mg AM50 and Ti6Al4V. Tests are carried out on shear compression specimens (SCS). The evolution of the Temperature in the deforming gauge section is monitored in real time, using an array of high speed infrared detectors synchronized with a Kolsky apparatus (split Hopkinson pressure bar). The evolution of the gage Temperature is found to comprise 3 basic stages, in agreement with Marchand and Duffy’s simultaneous observations of mechanical data and gauge deformation patterns (1988). The onset and full formation stages of ASB are identified by combining the collected thermal and mechanical data. Full development of the ASB is identified as the point at which the measured and Calculated Temperature curves intersect and diverge thereon. At that stage, the homogeneous strain assumption used in calculating the maximum Temperature rise is no longer valid.
D W Tang - One of the best experts on this subject based on the ideXlab platform.
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wavy wavelike diffusive thermal responses of finite rigid slabs to high speed heating of laser pulses
International Journal of Heat and Mass Transfer, 1999Co-Authors: D W Tang, N ArakiAbstract:Abstract A generalized macroscopic model is introduced in treating the transient heat conduction problems in finite rigid slabs irradiated by short pulse lasers. The analytical solution is derived by using Greens function method and finite integral transform technique. Various behaviors of conduction heat transfer, such as wave, wavelike, and diffusion, are exhibited by adjusting the relaxation parameters. Then detailed discussions have been given on the interrelations between these behaviors. The Calculated Temperature responses by this model are compared with two literature results measured under extremely low Temperature and ultra-high speed heating, respectively. The calculations show good agreement with the experimental data.
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thermal stress relaxation behavior in thin films under transient laser pulse heating
Journal of Applied Physics, 1993Co-Authors: D W Tang, B L Zhou, G H HeAbstract:Transient laser pulse has been used to generate nonsynchronous change of Temperature rise and thermal expansion in thin films. The transient process of thermal expansion is recorded by a photoelectric high‐speed acquisition system. By comparison of the Calculated Temperature rise and thermal expansion, thermal stress relaxation processes in Al films of 20–50 μm thickness is obtained. This result shows that, for transient heating, thermal stress exists even in the case of uniform Temperature distribution and free expansion. And also there is a transient high stress in thin films under high‐speed heating.
