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Nisith Ranjan Mandal - One of the best experts on this subject based on the ideXlab platform.

  • Numerical and experimental study of mitigation of welding distortion
    Applied Mathematical Modelling, 2010
    Co-Authors: Malabika Adak, Nisith Ranjan Mandal
    Abstract:

    Abstract Welding stresses and deformations are closely related phenomena. During the heating and cooling cycles thermal strains may occur in the weld and adjacent area. The strains produced during the heating stage of welding are always accompanied by plastic deformation of the metal. The stresses resulting from these strains combine and react to produce internal forces that cause a variety of welding distortions. Welding deformation needs to be minimized and also the designer should know before hand the extent of deformation so that it can be accounted for in the design as well as in the construction stages. In this paper, heat sinking as a method of distortion mitigation has been studied. Heat sinking has been affected by circulating water through channel clamped at the bottom surface of the plates undergoing welding. The pseudolinear equivalent Constant Rigidity concept has been used in this investigation for thermo-mechanical analysis of plates undergoing welding with simultaneous heat sinking. The initial nonlinear problem with varying modulus dependent on temperature is transformed into a pseudolinear equivalent system of Constant Rigidity that is solved by linear analysis. The numerical results compared very well with those of the experimental ones. The proposed concept is found to be computationally more efficient and simpler to model compared to FEM for solving similar thermo-elasto-plastic nonlinear problems. The procedure presented in this work and the results thus obtained, holds a great promise for determining the heat sinking parameters for effectively controlling welding distortion.

  • Pseudolinear equivalent Constant Rigidity concept for analyzing welding residual deformation
    Applied Mathematical Modelling, 2009
    Co-Authors: Malabika Adak, Nisith Ranjan Mandal
    Abstract:

    Abstract To ascertain the extent of deformation due to the thermal cycles caused by welding it calls for solving a complex thermal elasto-plastic problem, which is non-linear and involves plastic deformation of the medium at high temperature varying in both time and space. Analytical solutions turned out to be inadequate. At the same time conventional numerical techniques proved to be highly time consuming and thereby prohibitively expensive in real life situations. The concept of pseudolinear equivalent Constant Rigidity system was developed in this investigation for thermo-mechanical analysis of plates undergoing variation of Rigidity due to a continuously changing temperature profile as is encountered in welding situations. The initial non-linear problem with modulus varying with temperature was transformed into a pseudolinear equivalent system of Constant Rigidity that was solved by applying linear analysis. The numerical results compared very well with those of the experimental ones. The present method was found to be computationally more efficient and simpler to model compared to FEM for solving similar thermo-elasto-plastic nonlinear problems. The analysis procedure presented in this work and the results thus obtained, holds a great promise for analyzing the complicated thermo-elasto-plastic problems as encountered in real life situations.

  • Thermomechanical Analysis of Plates Undergoing Line Heating Using Pseudolinear Equivalent Constant Rigidity System
    Journal of ship production, 2004
    Co-Authors: Malabika Adak, Nisith Ranjan Mandal
    Abstract:

    Line-heating technique involves application of controlled thermal cycles. In developing the technique of line heating, which is nonlinear and involves plastic deformation of the medium at high temperature varying in both time and space, analytical solutions turned out to be inadequate. At the same time conventional numerical techniques proved to be highly time consuming and thereby prohibitively expensive in real life situations. In this investigation, the initial nonlinear problem with modulus varying with temperature was transformed into a pseudolinear equivalent system of Constant Rigidity that was solved by applying linear analysis. The analysis procedure presented in this work and the results thus obtained hold great promise for analyzing the complicated thermal elastic-plastic problems as encountered in line-heating process.

  • Thermo-mechanical analysis of plates undergoing line heating using pseudolinear equivalent Constant Rigidity system
    Transactions of the Society of Naval Architects and Marine Engineers, 2003
    Co-Authors: Malabika Adak, Nisith Ranjan Mandal
    Abstract:

    The analysis procedure presented in this work and the results thus obtained holds a great promise for analyzing the complicated thermoelastic-plastic problems as encountered in line heating process.

Malabika Adak - One of the best experts on this subject based on the ideXlab platform.

  • Numerical and experimental study of mitigation of welding distortion
    Applied Mathematical Modelling, 2010
    Co-Authors: Malabika Adak, Nisith Ranjan Mandal
    Abstract:

    Abstract Welding stresses and deformations are closely related phenomena. During the heating and cooling cycles thermal strains may occur in the weld and adjacent area. The strains produced during the heating stage of welding are always accompanied by plastic deformation of the metal. The stresses resulting from these strains combine and react to produce internal forces that cause a variety of welding distortions. Welding deformation needs to be minimized and also the designer should know before hand the extent of deformation so that it can be accounted for in the design as well as in the construction stages. In this paper, heat sinking as a method of distortion mitigation has been studied. Heat sinking has been affected by circulating water through channel clamped at the bottom surface of the plates undergoing welding. The pseudolinear equivalent Constant Rigidity concept has been used in this investigation for thermo-mechanical analysis of plates undergoing welding with simultaneous heat sinking. The initial nonlinear problem with varying modulus dependent on temperature is transformed into a pseudolinear equivalent system of Constant Rigidity that is solved by linear analysis. The numerical results compared very well with those of the experimental ones. The proposed concept is found to be computationally more efficient and simpler to model compared to FEM for solving similar thermo-elasto-plastic nonlinear problems. The procedure presented in this work and the results thus obtained, holds a great promise for determining the heat sinking parameters for effectively controlling welding distortion.

  • Pseudolinear equivalent Constant Rigidity concept for analyzing welding residual deformation
    Applied Mathematical Modelling, 2009
    Co-Authors: Malabika Adak, Nisith Ranjan Mandal
    Abstract:

    Abstract To ascertain the extent of deformation due to the thermal cycles caused by welding it calls for solving a complex thermal elasto-plastic problem, which is non-linear and involves plastic deformation of the medium at high temperature varying in both time and space. Analytical solutions turned out to be inadequate. At the same time conventional numerical techniques proved to be highly time consuming and thereby prohibitively expensive in real life situations. The concept of pseudolinear equivalent Constant Rigidity system was developed in this investigation for thermo-mechanical analysis of plates undergoing variation of Rigidity due to a continuously changing temperature profile as is encountered in welding situations. The initial non-linear problem with modulus varying with temperature was transformed into a pseudolinear equivalent system of Constant Rigidity that was solved by applying linear analysis. The numerical results compared very well with those of the experimental ones. The present method was found to be computationally more efficient and simpler to model compared to FEM for solving similar thermo-elasto-plastic nonlinear problems. The analysis procedure presented in this work and the results thus obtained, holds a great promise for analyzing the complicated thermo-elasto-plastic problems as encountered in real life situations.

  • Thermomechanical Analysis of Plates Undergoing Line Heating Using Pseudolinear Equivalent Constant Rigidity System
    Journal of ship production, 2004
    Co-Authors: Malabika Adak, Nisith Ranjan Mandal
    Abstract:

    Line-heating technique involves application of controlled thermal cycles. In developing the technique of line heating, which is nonlinear and involves plastic deformation of the medium at high temperature varying in both time and space, analytical solutions turned out to be inadequate. At the same time conventional numerical techniques proved to be highly time consuming and thereby prohibitively expensive in real life situations. In this investigation, the initial nonlinear problem with modulus varying with temperature was transformed into a pseudolinear equivalent system of Constant Rigidity that was solved by applying linear analysis. The analysis procedure presented in this work and the results thus obtained hold great promise for analyzing the complicated thermal elastic-plastic problems as encountered in line-heating process.

  • Thermo-mechanical analysis of plates undergoing line heating using pseudolinear equivalent Constant Rigidity system
    Transactions of the Society of Naval Architects and Marine Engineers, 2003
    Co-Authors: Malabika Adak, Nisith Ranjan Mandal
    Abstract:

    The analysis procedure presented in this work and the results thus obtained holds a great promise for analyzing the complicated thermoelastic-plastic problems as encountered in line heating process.

Paul Woafo - One of the best experts on this subject based on the ideXlab platform.

R. Ntchantcho - One of the best experts on this subject based on the ideXlab platform.

S. Noubissie - One of the best experts on this subject based on the ideXlab platform.