The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

Jue Zhong - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation for Stress strain distribution and microstructural evolution in 42crmo steel during hot upsetting process
    Computational Materials Science, 2008
    Co-Authors: Y C Lin, Mingsong Chen, Jue Zhong
    Abstract:

    Based on experimental results, the dynamic recrystallization mathematical models of 42CrMo steel were derived. The effects of strain rates on the strain/Stress distribution and microstructural evolution in 42CrMo steel during hot upsetting process were simulated by integrating the thermo-mechanical coupled finite element model. The results show that the deformation of the specimen is inhomogeneous, and the degree of the deformation inhomogeneity decreases with the increase of strain rates. The distribution of the Effective Stress in the specimen is also inhomogeneous, and the locus of the Maximum Effective Stress changes with the variations of strain rates. The dynamic recrystallization volume fraction decreases with the increase of strain rates. The distribution of the dynamic recrystallization grain is inhomogeneous in the deformed specimen, and the average dynamic recrystallization grain size decreases as the strain rate is increased. A good agreement between the predicted and experimental results confirmed that the derived dynamic recrystallization mathematical models can be successfully incorporated into the finite element model to predict the microstructural evolution in the hot upsetting process for 42CrMo steel.

  • Numerical simulation for Stress/strain distribution and microstructural evolution in 42CrMo steel during hot upsetting process
    Computational Materials Science, 2008
    Co-Authors: Y C Lin, Mingsong Chen, Jue Zhong
    Abstract:

    Based on experimental results, the dynamic recrystallization mathematical models of 42CrMo steel were derived. The effects of strain rates on the strain/Stress distribution and microstructural evolution in 42CrMo steel during hot upsetting process were simulated by integrating the thermo-mechanical coupled finite element model. The results show that the deformation of the specimen is inhomogeneous, and the degree of the deformation inhomogeneity decreases with the increase of strain rates. The distribution of the Effective Stress in the specimen is also inhomogeneous, and the locus of the Maximum Effective Stress changes with the variations of strain rates. The dynamic recrystallization volume fraction decreases with the increase of strain rates. The distribution of the dynamic recrystallization grain is inhomogeneous in the deformed specimen, and the average dynamic recrystallization grain size decreases as the strain rate is increased. A good agreement between the predicted and experimental results confirmed that the derived dynamic recrystallization mathematical models can be successfully incorporated into the finite element model to predict the microstructural evolution in the hot upsetting process for 42CrMo steel.

Tung Sheng Yang - One of the best experts on this subject based on the ideXlab platform.

  • Predictions of Maximum Forging Load and Effective Stress for Strain-Hardening Material of near Net-Shape Helical Gear Forging
    Applied Mechanics and Materials, 2013
    Co-Authors: Tung Sheng Yang, Tsung Hsien Yang
    Abstract:

    In this paper, the use of the finite element method in conjunction with abductive network is presented to predict the Maximum forging force and Effective Stress for strain-hardening material during near net-shape helical forging. The Maximum forging load and Effective Stress are influenced by the material properties such as yielding Stress, strength coefficient and strain hardening exponent. A finite element method is used to investigate the clamping-type forging of helical gear. In order to verify the prediction of FEM simulation for forging load, the experimental data are compared with the results of current simulation. A finite element analysis is also utilized to investigate the material properties on forging load and Maximum Effective Stress. Additionally, the abductive network was applied to synthesize the data sets obtained from the numerical simulation. The prediction models are then established for the Maximum forging load and Maximum Effective Stress of near net-shape helical gear forging under a suitable range of material parameters.

  • Notice of Retraction Predictions of Maximum forging load and Effective Stress for strain-hardening material of near net-shape helical gear forging
    2010 2nd International Conference on Computer Engineering and Technology, 2010
    Co-Authors: Tung Sheng Yang, Sheng-yi Chang, Jian-hui Wang
    Abstract:

    In this paper, the use of the finite element method in conjunction with abductive network is presented to predict the Maximum forging force and Effective Stress for strain-hardening material during near net-shape helical forging. The Maximum forging load and Effective Stress are influenced by the material properties such as yielding Stress, strength coefficient and strain hardening exponent. A finite element method is used to investigate the clamping-type forging of helical gear. In order to verify the prediction of FEM simulation for forging load, the experimental data are compared with the results of current simulation. A finite element analysis is also utilized to investigate the material properties on forging load and Maximum Effective stres. Additionally, the abductive network was applied to synthesize the data sets obtained from the numerical simulation. The prediction models are then established for the Maximum forging load and Maximum Effective Stress of near net-shape helical gear forging under a suitable range of material parameters.

  • The design of blank’s initial shape in the near net-shape deep drawing of square cup
    Journal of Mechanical Science and Technology, 2007
    Co-Authors: Tung Sheng Yang, R. F. Shyu
    Abstract:

    Deep drawing process is very useful in industrial field because of its efficiency. The deep drawing is affected by many process variables, such as blank shapes, profile radii of punch and die, formability of materials and so on. Especially, in order to obtain the optimal products in deep drawing process, blank shape is very important formability factor. In this paper, the finite element method is used to investigate the cup height of the square cup drawing process. In order to verify the prediction of FEM simulation of the product’s height and forming load in the square cup drawing process, the experimental data are compared with the results of the current simulation. A finite element analysis is also utilized to acquire the designed profile of the drawn products, a reverse forming method for obtaining the initial blank’s shape according to the forward square cup drawing simulation is proposed. The design of initial blank’s shape is also certified to obtain the designed profile of drawn cups by experiment. The influences of the blank’s shape on the height of product, the forming load, the Maximum Effective Stress and the Maximum Effective strain are also examined.

  • The prediction of Maximum forging load and Effective Stress for different material of bevel gear forging
    Journal of Mechanical Science and Technology, 2007
    Co-Authors: Tung Sheng Yang, N. C. Hwang, Sheng-yi Chang
    Abstract:

    The manufacture of gears by applying hot or cold bulk forming processes is a quite widespread production method due to its well-known basic advantages such as material and time cost reduction and the increased strength of the teeth. However, the associated process planning and tool design are more complicated. In the precision forging of gears, the workpiece volume, the die design, the power requirement and careful processing are more critical than traditional forging technology. For complete filling up, predicting the power requirement is an important feature of the near net-shape forging process. In this paper, a finite element analysis is utilized to investigate the material properties such as yielding Stress, strength coefficient and strain hardening exponent effects on forming load and Maximum Effective Stress. The adductive network was then applied to synthesize the data set obtained from the numerical simulation. The predicted results of the Maximum forging load and Maximum equivalent Stress of bevel gear forging from the prediction model are consistent with the results obtained from FEM simulation quite well. After employing the prediction model one can provide valuable references in prediction of the Maximum forging load and Maximum equivalent Stress of bevel gear forging under a suitable range of material parameters.

  • The design of blank's initial shape in the near net-shape deep drawing of square cup
    Journal of Mechanical Science and Technology, 2007
    Co-Authors: Tung Sheng Yang, R. F. Shyu
    Abstract:

    Deep drawing process is very useful in industrial field because of its efficiency. The deep drawing is affected by many process variables, such as blank shapes, profile radii of punch and die, formability of materials and so on. Especially, in order to obtain the optimal products in deep drawing process, blank shape is very important formability factor. In this paper, the finite element method is used to investigate the cup height of the square cup drawing process. In order to verify the prediction of FEM simulation of the product’s height and forming load in the square cup drawing process, the experimental data are compared with the results of the current simulation. A finite element analysis is also utilized to acquire the designed profile of the drawn products, a reverse forming method for obtaining the initial blank’s shape according to the forward square cup drawing simulation is proposed. The design of initial blank’s shape is also certified to obtain the designed profile of drawn cups by experiment. The influences of the blank’s shape on the height of product, the forming load, the Maximum Effective Stress and the Maximum Effective strain are also examined.

Xin-lin Gao - One of the best experts on this subject based on the ideXlab platform.

  • Elasto-plastic analysis of an internally pressurized thick-walled cylinder using a strain gradient plasticity theory
    International Journal of Solids and Structures, 2003
    Co-Authors: Xin-lin Gao
    Abstract:

    Abstract An analytical solution for the Stress, strain and displacement fields in an internally pressurized thick-walled cylinder of an elastic strain-hardening plastic material in the plane strain state is presented. A strain gradient plasticity theory is used to describe the constitutive behavior of the material undergoing plastic deformations, whereas the generalized Hooke’s law is invoked to represent the material response in the elastic region. The solution gives explicit expressions for the Stress, strain and displacement components. The inner radius of the cylinder enters these expressions not only in non-dimensional forms but also with its own dimensional identity, unlike classical plasticity-based solutions. As a result, the current solution can capture the size (strengthening) effect at the micron scale. The classical plasticity-based solution of the same problem is shown to be a special case of the present solution. Numerical results for the Maximum Effective Stress in the cylinder wall are also provided to illustrate applications of the newly derived solution.

  • Strain gradient plasticity solution for an internally pressurized thick-walled spherical shell of an elastic–plastic material
    Mechanics Research Communications, 2003
    Co-Authors: Xin-lin Gao
    Abstract:

    Abstract An analytical solution is presented for an internally pressurized thick-walled spherical shell of an elastic strain-hardening plastic material. A strain gradient plasticity theory is used to describe the constitutive behavior of the material undergoing plastic deformations, whereas the generalized Hooke’s law is invoked to represent the material response in the elastic region. The solution gives explicit expressions for the Stress, strain and displacement components. The inner radius of the shell enters these expressions not only in non-dimensional forms but also with its own dimensional identity, unlike classical plasticity-based solutions. As a result, the current solution can capture the size effect. The classical plasticity-based solution of the same problem is shown to be a special case of the present solution. Numerical results for the Maximum Effective Stress in the shell wall are also provided to illustrate applications of the newly derived solution. The new solution can be used to construct improved expanding cavity models in indentation mechanics that incorporate both the strain-hardening and indentation size effects.

Y C Lin - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation for Stress strain distribution and microstructural evolution in 42crmo steel during hot upsetting process
    Computational Materials Science, 2008
    Co-Authors: Y C Lin, Mingsong Chen, Jue Zhong
    Abstract:

    Based on experimental results, the dynamic recrystallization mathematical models of 42CrMo steel were derived. The effects of strain rates on the strain/Stress distribution and microstructural evolution in 42CrMo steel during hot upsetting process were simulated by integrating the thermo-mechanical coupled finite element model. The results show that the deformation of the specimen is inhomogeneous, and the degree of the deformation inhomogeneity decreases with the increase of strain rates. The distribution of the Effective Stress in the specimen is also inhomogeneous, and the locus of the Maximum Effective Stress changes with the variations of strain rates. The dynamic recrystallization volume fraction decreases with the increase of strain rates. The distribution of the dynamic recrystallization grain is inhomogeneous in the deformed specimen, and the average dynamic recrystallization grain size decreases as the strain rate is increased. A good agreement between the predicted and experimental results confirmed that the derived dynamic recrystallization mathematical models can be successfully incorporated into the finite element model to predict the microstructural evolution in the hot upsetting process for 42CrMo steel.

  • Numerical simulation for Stress/strain distribution and microstructural evolution in 42CrMo steel during hot upsetting process
    Computational Materials Science, 2008
    Co-Authors: Y C Lin, Mingsong Chen, Jue Zhong
    Abstract:

    Based on experimental results, the dynamic recrystallization mathematical models of 42CrMo steel were derived. The effects of strain rates on the strain/Stress distribution and microstructural evolution in 42CrMo steel during hot upsetting process were simulated by integrating the thermo-mechanical coupled finite element model. The results show that the deformation of the specimen is inhomogeneous, and the degree of the deformation inhomogeneity decreases with the increase of strain rates. The distribution of the Effective Stress in the specimen is also inhomogeneous, and the locus of the Maximum Effective Stress changes with the variations of strain rates. The dynamic recrystallization volume fraction decreases with the increase of strain rates. The distribution of the dynamic recrystallization grain is inhomogeneous in the deformed specimen, and the average dynamic recrystallization grain size decreases as the strain rate is increased. A good agreement between the predicted and experimental results confirmed that the derived dynamic recrystallization mathematical models can be successfully incorporated into the finite element model to predict the microstructural evolution in the hot upsetting process for 42CrMo steel.

Mingsong Chen - One of the best experts on this subject based on the ideXlab platform.

  • numerical simulation for Stress strain distribution and microstructural evolution in 42crmo steel during hot upsetting process
    Computational Materials Science, 2008
    Co-Authors: Y C Lin, Mingsong Chen, Jue Zhong
    Abstract:

    Based on experimental results, the dynamic recrystallization mathematical models of 42CrMo steel were derived. The effects of strain rates on the strain/Stress distribution and microstructural evolution in 42CrMo steel during hot upsetting process were simulated by integrating the thermo-mechanical coupled finite element model. The results show that the deformation of the specimen is inhomogeneous, and the degree of the deformation inhomogeneity decreases with the increase of strain rates. The distribution of the Effective Stress in the specimen is also inhomogeneous, and the locus of the Maximum Effective Stress changes with the variations of strain rates. The dynamic recrystallization volume fraction decreases with the increase of strain rates. The distribution of the dynamic recrystallization grain is inhomogeneous in the deformed specimen, and the average dynamic recrystallization grain size decreases as the strain rate is increased. A good agreement between the predicted and experimental results confirmed that the derived dynamic recrystallization mathematical models can be successfully incorporated into the finite element model to predict the microstructural evolution in the hot upsetting process for 42CrMo steel.

  • Numerical simulation for Stress/strain distribution and microstructural evolution in 42CrMo steel during hot upsetting process
    Computational Materials Science, 2008
    Co-Authors: Y C Lin, Mingsong Chen, Jue Zhong
    Abstract:

    Based on experimental results, the dynamic recrystallization mathematical models of 42CrMo steel were derived. The effects of strain rates on the strain/Stress distribution and microstructural evolution in 42CrMo steel during hot upsetting process were simulated by integrating the thermo-mechanical coupled finite element model. The results show that the deformation of the specimen is inhomogeneous, and the degree of the deformation inhomogeneity decreases with the increase of strain rates. The distribution of the Effective Stress in the specimen is also inhomogeneous, and the locus of the Maximum Effective Stress changes with the variations of strain rates. The dynamic recrystallization volume fraction decreases with the increase of strain rates. The distribution of the dynamic recrystallization grain is inhomogeneous in the deformed specimen, and the average dynamic recrystallization grain size decreases as the strain rate is increased. A good agreement between the predicted and experimental results confirmed that the derived dynamic recrystallization mathematical models can be successfully incorporated into the finite element model to predict the microstructural evolution in the hot upsetting process for 42CrMo steel.