Abstract
In Layered Manufacturing (LM), the CAD model of a part is sliced into layers using the conventional STL file format. This Layer wise data is fed into a deposition system, which then builds up the part, depositing the required material, layer by layer. The manufacturing of form-fit-function component rather then form-fit component is a major issue in Layered Manufacturing based Rapid Proto typing systems. As the deposition method, Gas Metal Arc welding (GMAW) has shown potential, for LM of metallic components, due to its inherent feature of high inter-layer and metallurgical bonding. Residual Stress induced warping is a major concern in a variety of LM processes, particularly those seeking to build parts directly without post processing steps. Welding is one of those processes where high heat input results in large thermal gradients; these thermal gradients along with the mechanical constraints cause the build up of residual stresses. In order to reduce the residual stresses and deformation, the first step is to correctly model the thermal cycle associated with the deposition process. More over important deposition parameters like re-melting depth, heat affected zone can also be predicted from the thermal model This paper presents a 3D finite element based thermal model
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Fawad, H;
Mughal, M P;
Siddique, M
[1]
- Ghulam Ishaq Khan Inst. of Engineering Sciences and Technology, Topi (Pakistan). Faculty of Mechanical Engineering
Citation Formats
Fawad, H, Mughal, M P, and Siddique, M.
Finite element simulation of welding based deposition process as applied to layered manufacturing: thermal model.
Pakistan: N. p.,
2004.
Web.
Fawad, H, Mughal, M P, & Siddique, M.
Finite element simulation of welding based deposition process as applied to layered manufacturing: thermal model.
Pakistan.
Fawad, H, Mughal, M P, and Siddique, M.
2004.
"Finite element simulation of welding based deposition process as applied to layered manufacturing: thermal model."
Pakistan.
@misc{etde_20618808,
title = {Finite element simulation of welding based deposition process as applied to layered manufacturing: thermal model}
author = {Fawad, H, Mughal, M P, and Siddique, M}
abstractNote = {In Layered Manufacturing (LM), the CAD model of a part is sliced into layers using the conventional STL file format. This Layer wise data is fed into a deposition system, which then builds up the part, depositing the required material, layer by layer. The manufacturing of form-fit-function component rather then form-fit component is a major issue in Layered Manufacturing based Rapid Proto typing systems. As the deposition method, Gas Metal Arc welding (GMAW) has shown potential, for LM of metallic components, due to its inherent feature of high inter-layer and metallurgical bonding. Residual Stress induced warping is a major concern in a variety of LM processes, particularly those seeking to build parts directly without post processing steps. Welding is one of those processes where high heat input results in large thermal gradients; these thermal gradients along with the mechanical constraints cause the build up of residual stresses. In order to reduce the residual stresses and deformation, the first step is to correctly model the thermal cycle associated with the deposition process. More over important deposition parameters like re-melting depth, heat affected zone can also be predicted from the thermal model This paper presents a 3D finite element based thermal model of a novel welding based deposition process as applied to layered manufacturing. A Commercial finite element software ANSYS is coupled with a user programmed subroutine to implement the main welding features like Goldak Double Ellipsoidal Heat source, material addition, temperature dependent material properties along with the deposition features like deposition patterns and dimensions. Simulations have been carried out with various patterns and inter pass time and it has been found that different deposition patterns cause change in Remelting depth and thermal gradients. (author)}
place = {Pakistan}
year = {2004}
month = {Jul}
}
title = {Finite element simulation of welding based deposition process as applied to layered manufacturing: thermal model}
author = {Fawad, H, Mughal, M P, and Siddique, M}
abstractNote = {In Layered Manufacturing (LM), the CAD model of a part is sliced into layers using the conventional STL file format. This Layer wise data is fed into a deposition system, which then builds up the part, depositing the required material, layer by layer. The manufacturing of form-fit-function component rather then form-fit component is a major issue in Layered Manufacturing based Rapid Proto typing systems. As the deposition method, Gas Metal Arc welding (GMAW) has shown potential, for LM of metallic components, due to its inherent feature of high inter-layer and metallurgical bonding. Residual Stress induced warping is a major concern in a variety of LM processes, particularly those seeking to build parts directly without post processing steps. Welding is one of those processes where high heat input results in large thermal gradients; these thermal gradients along with the mechanical constraints cause the build up of residual stresses. In order to reduce the residual stresses and deformation, the first step is to correctly model the thermal cycle associated with the deposition process. More over important deposition parameters like re-melting depth, heat affected zone can also be predicted from the thermal model This paper presents a 3D finite element based thermal model of a novel welding based deposition process as applied to layered manufacturing. A Commercial finite element software ANSYS is coupled with a user programmed subroutine to implement the main welding features like Goldak Double Ellipsoidal Heat source, material addition, temperature dependent material properties along with the deposition features like deposition patterns and dimensions. Simulations have been carried out with various patterns and inter pass time and it has been found that different deposition patterns cause change in Remelting depth and thermal gradients. (author)}
place = {Pakistan}
year = {2004}
month = {Jul}
}