The Experts below are selected from a list of 106950 Experts worldwide ranked by ideXlab platform
Y J Chao - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of Transient Temperature and residual stresses in friction stir welding of 304l stainless steel
Journal of Materials Processing Technology, 2004Co-Authors: X K Zhu, Y J ChaoAbstract:Abstract Three-dimensional nonlinear thermal and thermo-mechanical numerical simulations are conducted for the friction stir welding (FSW) of 304L stainless steel. The finite element analysis code—WELDSIM, developed by the authors specifically for welding simulation, was used. Two welding cases with tool rotational speeds of 300 and 500 rpm are analyzed. The objective is to study the variation of Transient Temperature and residual stress in a friction stir welded plate of 304L stainless steel. Based on the experimental records of Transient Temperature at several specific locations during the friction stir welding process for the 304L stainless steel, an inverse analysis method for thermal numerical simulation is developed. After the Transient Temperature field is determined, the residual stresses in the welded plate are then calculated using a three-dimensional elastic–plastic thermo-mechanical simulation. The effect of fixture release after the welding on the residual stresses is also studied. Comparison with the residual stress fields measured by the neutron diffraction technique shows that the results from the present numerical simulation have good agreement with the test data.
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numerical simulation of Transient Temperature and residual stresses in friction stir welding of 304l stainless steel
Journal of Materials Processing Technology, 2004Co-Authors: X K Zhu, Y J ChaoAbstract:Abstract Three-dimensional nonlinear thermal and thermo-mechanical numerical simulations are conducted for the friction stir welding (FSW) of 304L stainless steel. The finite element analysis code—WELDSIM, developed by the authors specifically for welding simulation, was used. Two welding cases with tool rotational speeds of 300 and 500 rpm are analyzed. The objective is to study the variation of Transient Temperature and residual stress in a friction stir welded plate of 304L stainless steel. Based on the experimental records of Transient Temperature at several specific locations during the friction stir welding process for the 304L stainless steel, an inverse analysis method for thermal numerical simulation is developed. After the Transient Temperature field is determined, the residual stresses in the welded plate are then calculated using a three-dimensional elastic–plastic thermo-mechanical simulation. The effect of fixture release after the welding on the residual stresses is also studied. Comparison with the residual stress fields measured by the neutron diffraction technique shows that the results from the present numerical simulation have good agreement with the test data.
X K Zhu - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of Transient Temperature and residual stresses in friction stir welding of 304l stainless steel
Journal of Materials Processing Technology, 2004Co-Authors: X K Zhu, Y J ChaoAbstract:Abstract Three-dimensional nonlinear thermal and thermo-mechanical numerical simulations are conducted for the friction stir welding (FSW) of 304L stainless steel. The finite element analysis code—WELDSIM, developed by the authors specifically for welding simulation, was used. Two welding cases with tool rotational speeds of 300 and 500 rpm are analyzed. The objective is to study the variation of Transient Temperature and residual stress in a friction stir welded plate of 304L stainless steel. Based on the experimental records of Transient Temperature at several specific locations during the friction stir welding process for the 304L stainless steel, an inverse analysis method for thermal numerical simulation is developed. After the Transient Temperature field is determined, the residual stresses in the welded plate are then calculated using a three-dimensional elastic–plastic thermo-mechanical simulation. The effect of fixture release after the welding on the residual stresses is also studied. Comparison with the residual stress fields measured by the neutron diffraction technique shows that the results from the present numerical simulation have good agreement with the test data.
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numerical simulation of Transient Temperature and residual stresses in friction stir welding of 304l stainless steel
Journal of Materials Processing Technology, 2004Co-Authors: X K Zhu, Y J ChaoAbstract:Abstract Three-dimensional nonlinear thermal and thermo-mechanical numerical simulations are conducted for the friction stir welding (FSW) of 304L stainless steel. The finite element analysis code—WELDSIM, developed by the authors specifically for welding simulation, was used. Two welding cases with tool rotational speeds of 300 and 500 rpm are analyzed. The objective is to study the variation of Transient Temperature and residual stress in a friction stir welded plate of 304L stainless steel. Based on the experimental records of Transient Temperature at several specific locations during the friction stir welding process for the 304L stainless steel, an inverse analysis method for thermal numerical simulation is developed. After the Transient Temperature field is determined, the residual stresses in the welded plate are then calculated using a three-dimensional elastic–plastic thermo-mechanical simulation. The effect of fixture release after the welding on the residual stresses is also studied. Comparison with the residual stress fields measured by the neutron diffraction technique shows that the results from the present numerical simulation have good agreement with the test data.
Ding Zhu - One of the best experts on this subject based on the ideXlab platform.
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determining multilayer formation properties from Transient Temperature and pressure measurements in gas wells with commingled zones
Journal of Natural Gas Science and Engineering, 2012Co-Authors: Weibo Sui, Ding ZhuAbstract:Abstract With the evolution of downhole permanent monitoring techniques, Transient Temperature and pressure data can play an important role in reservoir description due to their inherent real-time characteristics. Previous studies presented a completely new analysis technique for quantifying permeability and altered zone permeability and radius for multiple commingled layers. However, the previous model mainly applies for single-phase oil flow. A new wellbore/reservoir coupled flow model has been developed for multilayer commingled gas reservoirs including both damage and non-Darcy skin in each commingled layer. The non-Darcy effects are considered as permeability alteration and are incorporated to the reservoir flow model by using Forchheimer equation. Additionally, this coupled flow model can consider the pressure drop due to friction and kinetic energy changes in wellbore over the producing layers, which yields more accurate Transient layer flow rate allocation. This coupled flow model is used to provide the wellbore pressure distribution and the radial reservoir pressure gradient for the coupled wellbore/reservoir Temperature model. The Temperature model is formulated using wellbore and reservoir energy balance equations considering subtle thermal factors such as Joule–Thomson effect and also using fluid properties which are dependent on in-situ pressure and Temperature. The inverse method is adopted from previous study directly and is used for determining formation properties by doing nonlinear regression. The mathematical model is solved numerically and used to study the sensitivity of Transient Temperature behavior to formation properties. The results show that Transient Temperature behavior in the wellbore at strategic locations is very sensitive to formation property values and has some interesting characteristics. However, due to the non-Darcy effects, each producing layer in multilayer gas reservoirs has non-Darcy skin more or less, which makes the Transient Temperature changes in gas reservoirs show more complex behavior. In the end, two hypothetical examples are presented to show the performance of the inverse method. The regression results show that the damage skin location and magnitude can be determined correctly using the proposed testing method.
Weibo Sui - One of the best experts on this subject based on the ideXlab platform.
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determining multilayer formation properties from Transient Temperature and pressure measurements in gas wells with commingled zones
Journal of Natural Gas Science and Engineering, 2012Co-Authors: Weibo Sui, Ding ZhuAbstract:Abstract With the evolution of downhole permanent monitoring techniques, Transient Temperature and pressure data can play an important role in reservoir description due to their inherent real-time characteristics. Previous studies presented a completely new analysis technique for quantifying permeability and altered zone permeability and radius for multiple commingled layers. However, the previous model mainly applies for single-phase oil flow. A new wellbore/reservoir coupled flow model has been developed for multilayer commingled gas reservoirs including both damage and non-Darcy skin in each commingled layer. The non-Darcy effects are considered as permeability alteration and are incorporated to the reservoir flow model by using Forchheimer equation. Additionally, this coupled flow model can consider the pressure drop due to friction and kinetic energy changes in wellbore over the producing layers, which yields more accurate Transient layer flow rate allocation. This coupled flow model is used to provide the wellbore pressure distribution and the radial reservoir pressure gradient for the coupled wellbore/reservoir Temperature model. The Temperature model is formulated using wellbore and reservoir energy balance equations considering subtle thermal factors such as Joule–Thomson effect and also using fluid properties which are dependent on in-situ pressure and Temperature. The inverse method is adopted from previous study directly and is used for determining formation properties by doing nonlinear regression. The mathematical model is solved numerically and used to study the sensitivity of Transient Temperature behavior to formation properties. The results show that Transient Temperature behavior in the wellbore at strategic locations is very sensitive to formation property values and has some interesting characteristics. However, due to the non-Darcy effects, each producing layer in multilayer gas reservoirs has non-Darcy skin more or less, which makes the Transient Temperature changes in gas reservoirs show more complex behavior. In the end, two hypothetical examples are presented to show the performance of the inverse method. The regression results show that the damage skin location and magnitude can be determined correctly using the proposed testing method.
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Determining Multilayer Formation Properties From Transient Temperature and Pressure Measurements
Petroleum Science and Technology, 2012Co-Authors: Weibo SuiAbstract:Abstract The authors introduce an entirely new Multilayer Transient Testing approach that uses Transient Temperature data at multiple locations together with a single-point Transient pressure measurement. The article presents the complete mathematical model including the forward and inverse models. The forward model couples wellbore and reservoir models for simulating Transient Temperature and pressure for single-phase flow, and it is used to investigate the possibility of evaluating formation properties from Transient Temperature and pressure measurements. With the inverse model, permeability, damaged permeability, and damaged radius in multiple layers can be quantified as independent regression parameters.
Mani Sankar Dasgupta - One of the best experts on this subject based on the ideXlab platform.
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Parametric study of Transient Temperature distribution in FSW of 304L stainless steel
The International Journal of Advanced Manufacturing Technology, 2015Co-Authors: Parth Chansoria, Prem K. Solanki, Mani Sankar DasguptaAbstract:Three-dimensional nonlinear thermal simulations are carried out for the friction stir welding (FSW) of 304L stainless steel using finite element analysis software—COMSOL® Multiphysics. Based on published experimental data of Transient Temperature for the Stainless Steel 304L, the thermal numerical simulation is verified. Cases of parametric sweeps for a few important welding parameters like normal force (5–50 kN), rotational speed (200–1500 RPM), shoulder radius (10–50 mm), and translational speed (0.5–3 mm s−1) are analyzed at three specific locations for the friction stir welding process. The objective of this analysis is to study the effect on Transient Temperature during the welding operation with varying parameters. The validated model is extended to parametric study of variation of Transient Temperature with shoulder radius and normal force that have not yet been experimentally validated. Transient Temperature is an important factor for successful fusion of metal. The simulation shows an increasing trend of the peak Temperature with increasing tool rotational speed, decreasing travel speed, increasing shoulder radius, and increasing normal force. This analysis can assist in choosing optimum welding parameters for successful welding under various constraints and for prediction and control of heat-affected zone.
