The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Dean Deng - One of the best experts on this subject based on the ideXlab platform.
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effects of pass arrangement on angular distortion residual stresses and lamellar tearing tendency in Thick Plate t joints of low alloy steel
Journal of Materials Processing Technology, 2019Co-Authors: Chaohua Zhang, Suo Li, Long Hu, Dean DengAbstract:Abstract Three Thick-Plate T-joints with different pass arrangements were fabricated using low alloy steel. Experiments were conducted to measure the angular distortion and residual stress distribution of these T-joints. Based on ABAQUS code, a sequentially coupled thermal-mechanical finite element method considering moving heat source was developed to model the welding deformation and residual stress distribution of the multi-pass T-joints. The evolution of the angular distortion and stress distribution during welding process of the three T-joints was analyzed by means of numerical simulation. The peak stress distribution in the Thickness direction of the flange during the entire welding process was examined based on the simulation results, and the lamellar tearing tendency of the T-joints was investigated. Among the three pass arrangements, the pass arrangement that welding passes are attached to the flange with surfacing welding produces the minimum angular distortion and has the lowest tendency of lamellar tearing for Thick-Plate T-joints.
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effects of pass arrangement on angular distortion residual stresses and lamellar tearing tendency in Thick Plate t joints of low alloy steel
Journal of Materials Processing Technology, 2019Co-Authors: Chaohua Zhang, Suo Li, Long Hu, Dean DengAbstract:Abstract Three Thick-Plate T-joints with different pass arrangements were fabricated using low alloy steel. Experiments were conducted to measure the angular distortion and residual stress distribution of these T-joints. Based on ABAQUS code, a sequentially coupled thermal-mechanical finite element method considering moving heat source was developed to model the welding deformation and residual stress distribution of the multi-pass T-joints. The evolution of the angular distortion and stress distribution during welding process of the three T-joints was analyzed by means of numerical simulation. The peak stress distribution in the Thickness direction of the flange during the entire welding process was examined based on the simulation results, and the lamellar tearing tendency of the T-joints was investigated. Among the three pass arrangements, the pass arrangement that welding passes are attached to the flange with surfacing welding produces the minimum angular distortion and has the lowest tendency of lamellar tearing for Thick-Plate T-joints.
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controlling angular distortion in high strength low alloy steel Thick Plate t joints
Journal of Materials Processing Technology, 2019Co-Authors: Chaohua Zhang, Suo Li, Yifeng Wang, Dean DengAbstract:Abstract Both numerical approach and experimental method were employed to investigate angular distortion and welding residual stress of Thick-Plate multi-pass T-joints made of high strength low alloy steel. The efficiency of controlling angular distortion by the structural restraint method and the presetting method was quantitatively examined based on the simulation results and the experimental measurements. The structural restraint method can reduce angular distortion of the T-joint by 73%, while the presetting method can almost completely eliminate the angular distortion through setting an appropriate initial presetting. The structural restraint method can slightly mitigate the final welding residual stress, and the presetting method has a negligible influence on the welding residual stress distribution.
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Investigation of welding residual stress distribution in a Thick-Plate joint with an emphasis on the features near weld end-start
Materials and Design, 2015Co-Authors: Wei Liang, Hidekazu Murakawa, Dean DengAbstract:In this study, an advanced computational approach with considering moving heat source, temperature-dependent material properties, strain-hardening and annealing effect was developed to predict welding temperature field, residual stress distribution and deformation in multi-pass welded joints. The welding residual stress distributions in austenitic stainless steel Thick-Plate multi-pass joints performed by the different deposition patterns and different deposition directions were simulated through using the developed computational procedure. Based on the numerical results, the features of residual stress distribution near the weld end-start location were examined. Meanwhile, experiments were carried out to measure the welding residual stress distributions in two mock-ups. The numerical results are generally in a good agreement with the experimental measurements. Both experiment and numerical model show that the distribution of welding residual stress near the weld end-start location has an apparent discontinuous feature. The research results indicate that deposition pattern has a significant influence on welding residual stress, and it not only can change the distribution shape of residual stress but also can alter the peak value of residual stress. Under the condition of identical deposition pattern, the distribution of welding residual stress seems not sensitive to deposition direction.
Wanji Chen - One of the best experts on this subject based on the ideXlab platform.
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a model of composite laminated reddy Plate based on new modified couple stress theory
Composite Structures, 2012Co-Authors: Wanji Chen, Ma Xu, Li LiAbstract:Abstract Based on new modified couple stress theory a model for composite laminated Reddy Plate is developed in first time. In this theory a new curvature tensor is defined for establishing the constitutive relations of laminated Plate. The characterization of anisotropy is incorporated into higher-order laminated Plate theories based on the modified couple stress theory by Yang et al. in 2002. The form of new curvature tensor is asymmetric, however it can result in same as the symmetric curvature tensor in the isotropic elasticity. The present model of Thick Plate can be viewed as a simplified couple stress theory in engineering mechanics. Moreover, a more simplified model for cross-ply composite laminated Reddy Plate of couple stress theory with one material’s length constant is used to demonstrate the scale effects. Numerical results show that the present Plate model can capture the scale effects of microstructure. Additionally, the present model of Thick Plate model can be degenerated to the model of composite cross-ply laminated Kirchhoff Plate and Mindlin Plate of couple stress theory.
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a model of composite laminated reddy beam based on a modified couple stress theory
Composite Structures, 2012Co-Authors: Wanji ChenAbstract:Abstract Based on new modified couple stress theory a model for composite laminated Reddy Plate is developed in first time. In this theory a new curvature tensor is defined for establishing the constitutive relations of laminated Plate. The characterization of anisotropy is incorporated into higher-order laminated Plate theories based on the modified couple stress theory by Yang et al. in 2002. The form of new curvature tensor is asymmetric, however it can result in same as the symmetric curvature tensor in the isotropic elasticity. The present model of Thick Plate can be viewed as a simplified couple stress theory in engineering mechanics. Moreover, a more simplified model for cross-ply composite laminated Reddy Plate of couple stress theory with one material’s length constant is used to demonstrate the scale effects. Numerical results show that the present Plate model can capture the scale effects of microstructure. Additionally, the present model of Thick Plate model can be degenerated to the model of composite cross-ply laminated Kirchhoff Plate and Mindlin Plate of couple stress theory.
Chaohua Zhang - One of the best experts on this subject based on the ideXlab platform.
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effects of pass arrangement on angular distortion residual stresses and lamellar tearing tendency in Thick Plate t joints of low alloy steel
Journal of Materials Processing Technology, 2019Co-Authors: Chaohua Zhang, Suo Li, Long Hu, Dean DengAbstract:Abstract Three Thick-Plate T-joints with different pass arrangements were fabricated using low alloy steel. Experiments were conducted to measure the angular distortion and residual stress distribution of these T-joints. Based on ABAQUS code, a sequentially coupled thermal-mechanical finite element method considering moving heat source was developed to model the welding deformation and residual stress distribution of the multi-pass T-joints. The evolution of the angular distortion and stress distribution during welding process of the three T-joints was analyzed by means of numerical simulation. The peak stress distribution in the Thickness direction of the flange during the entire welding process was examined based on the simulation results, and the lamellar tearing tendency of the T-joints was investigated. Among the three pass arrangements, the pass arrangement that welding passes are attached to the flange with surfacing welding produces the minimum angular distortion and has the lowest tendency of lamellar tearing for Thick-Plate T-joints.
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effects of pass arrangement on angular distortion residual stresses and lamellar tearing tendency in Thick Plate t joints of low alloy steel
Journal of Materials Processing Technology, 2019Co-Authors: Chaohua Zhang, Suo Li, Long Hu, Dean DengAbstract:Abstract Three Thick-Plate T-joints with different pass arrangements were fabricated using low alloy steel. Experiments were conducted to measure the angular distortion and residual stress distribution of these T-joints. Based on ABAQUS code, a sequentially coupled thermal-mechanical finite element method considering moving heat source was developed to model the welding deformation and residual stress distribution of the multi-pass T-joints. The evolution of the angular distortion and stress distribution during welding process of the three T-joints was analyzed by means of numerical simulation. The peak stress distribution in the Thickness direction of the flange during the entire welding process was examined based on the simulation results, and the lamellar tearing tendency of the T-joints was investigated. Among the three pass arrangements, the pass arrangement that welding passes are attached to the flange with surfacing welding produces the minimum angular distortion and has the lowest tendency of lamellar tearing for Thick-Plate T-joints.
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controlling angular distortion in high strength low alloy steel Thick Plate t joints
Journal of Materials Processing Technology, 2019Co-Authors: Chaohua Zhang, Suo Li, Yifeng Wang, Dean DengAbstract:Abstract Both numerical approach and experimental method were employed to investigate angular distortion and welding residual stress of Thick-Plate multi-pass T-joints made of high strength low alloy steel. The efficiency of controlling angular distortion by the structural restraint method and the presetting method was quantitatively examined based on the simulation results and the experimental measurements. The structural restraint method can reduce angular distortion of the T-joint by 73%, while the presetting method can almost completely eliminate the angular distortion through setting an appropriate initial presetting. The structural restraint method can slightly mitigate the final welding residual stress, and the presetting method has a negligible influence on the welding residual stress distribution.
Suo Li - One of the best experts on this subject based on the ideXlab platform.
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effects of pass arrangement on angular distortion residual stresses and lamellar tearing tendency in Thick Plate t joints of low alloy steel
Journal of Materials Processing Technology, 2019Co-Authors: Chaohua Zhang, Suo Li, Long Hu, Dean DengAbstract:Abstract Three Thick-Plate T-joints with different pass arrangements were fabricated using low alloy steel. Experiments were conducted to measure the angular distortion and residual stress distribution of these T-joints. Based on ABAQUS code, a sequentially coupled thermal-mechanical finite element method considering moving heat source was developed to model the welding deformation and residual stress distribution of the multi-pass T-joints. The evolution of the angular distortion and stress distribution during welding process of the three T-joints was analyzed by means of numerical simulation. The peak stress distribution in the Thickness direction of the flange during the entire welding process was examined based on the simulation results, and the lamellar tearing tendency of the T-joints was investigated. Among the three pass arrangements, the pass arrangement that welding passes are attached to the flange with surfacing welding produces the minimum angular distortion and has the lowest tendency of lamellar tearing for Thick-Plate T-joints.
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effects of pass arrangement on angular distortion residual stresses and lamellar tearing tendency in Thick Plate t joints of low alloy steel
Journal of Materials Processing Technology, 2019Co-Authors: Chaohua Zhang, Suo Li, Long Hu, Dean DengAbstract:Abstract Three Thick-Plate T-joints with different pass arrangements were fabricated using low alloy steel. Experiments were conducted to measure the angular distortion and residual stress distribution of these T-joints. Based on ABAQUS code, a sequentially coupled thermal-mechanical finite element method considering moving heat source was developed to model the welding deformation and residual stress distribution of the multi-pass T-joints. The evolution of the angular distortion and stress distribution during welding process of the three T-joints was analyzed by means of numerical simulation. The peak stress distribution in the Thickness direction of the flange during the entire welding process was examined based on the simulation results, and the lamellar tearing tendency of the T-joints was investigated. Among the three pass arrangements, the pass arrangement that welding passes are attached to the flange with surfacing welding produces the minimum angular distortion and has the lowest tendency of lamellar tearing for Thick-Plate T-joints.
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controlling angular distortion in high strength low alloy steel Thick Plate t joints
Journal of Materials Processing Technology, 2019Co-Authors: Chaohua Zhang, Suo Li, Yifeng Wang, Dean DengAbstract:Abstract Both numerical approach and experimental method were employed to investigate angular distortion and welding residual stress of Thick-Plate multi-pass T-joints made of high strength low alloy steel. The efficiency of controlling angular distortion by the structural restraint method and the presetting method was quantitatively examined based on the simulation results and the experimental measurements. The structural restraint method can reduce angular distortion of the T-joint by 73%, while the presetting method can almost completely eliminate the angular distortion through setting an appropriate initial presetting. The structural restraint method can slightly mitigate the final welding residual stress, and the presetting method has a negligible influence on the welding residual stress distribution.
Laizhu Jiang - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of friction stir welded 18cr 2mo ferritic stainless steel Thick Plate
Materials & Design, 2014Co-Authors: Jian Han, Zhixiong Zhu, Frank Barbaro, Laizhu JiangAbstract:Abstract In this study, microstructure and mechanical properties of a friction stir welded 18Cr–2Mo ferritic stainless steel Thick Plate were investigated. The 5.4 mm Thick Plates with excellent properties were welded at a constant rotational speed and a changeable welding speed using a composite tool featuring a chosen volume fraction of cubic boron nitride (cBN) in a W–Re matrix. The high-quality welds were successfully produced with optimised welding parameters, and studied by means of optical microscopy (OM), scanning electron microscopy (SEM), electron back-scattered diffraction (EBSD) and standard hardness and impact toughness testing. The results show that microstructure and mechanical properties of the joints are affected greatly, which is mainly related to the remarkably fine-grained microstructure of equiaxed ferrite that is observed in the friction stir welded joint. Meanwhile, the ratios of low-angle grain boundary in the stir zone regions significantly increase, and the texture turns strong. Compared with the base material, mechanical properties of the joint are maintained in a comparatively high level.
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effects of processing optimisation on microstructure texture grain boundary and mechanical properties of fe 17cr ferritic stainless steel Thick Plates
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Jian Han, Zhixiong Zhu, Laizhu JiangAbstract:Abstract The relationships between microstructure, texture, grain boundary and tensile strength, Charpy impact toughness of (Nb+Ti+V) stabilised Fe–17Cr ferritic stainless steel Thick Plates were investigated by means of optical microscopy, X-ray diffraction, scanning electron microscopy, electron backscatter diffraction, tensile and Charpy impact testing. The results show that for Fe–17Cr ferritic stainless steel Thick Plate, the addition of warm rolling procedure leads to refinement of grain size, modification of texture, and then optimisation of grain boundary, including grain boundary character distribution and grain boundary connectivity. Meanwhile, the mechanical testing results indicate that optimal transformation that warm rolling procedure brings to Fe–17Cr ferritic steel Thick Plate is beneficial to its mechanical properties.
