Three-Dimensional Modeling of Void Growth in Friction Stir Welding of Stainless Steel

2007 ◽  
Author(s):  
Youliang He ◽  
Donald E. Boyce ◽  
Paul R. Dawson
Keyword(s):  
Stainless Steel ◽  
Friction Stir Welding ◽  
Void Growth ◽  
Three Dimensional ◽  
Friction Stir ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling

Three-dimensional numerical and experimental investigation on friction stir welding processes of ferritic stainless steel

2013 ◽  
Vol 61 (7) ◽  
pp. 2649-2661 ◽  
Author(s):  
Hoon-Hwe Cho ◽  
Sung-Tae Hong ◽  
Jae-Hun Roh ◽  
Hyun-Sik Choi ◽  
Suk Hoon Kang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Stainless Steel ◽  
Friction Stir Welding ◽  
Ferritic Stainless Steel ◽  
Three Dimensional ◽  
Friction Stir ◽  
Welding Processes

Modeling Texture Evolution During Friction Stir Welding of Stainless Steel With Comparison to Experiments

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
Jae-Hyung Cho ◽  
Paul R. Dawson
Keyword(s):  
Stainless Steel ◽  
Friction Stir Welding ◽  
Electron Backscatter Diffraction ◽  
Texture Evolution ◽  
Three Dimensional ◽  
Element Formulation ◽  
Friction Stir ◽  
Polycrystal Plasticity ◽  
Backscatter Diffraction ◽  
Tool Pin

Texture evolution during friction stir welding of stainless steel was investigated using a polycrystal plasticity model together with a three-dimensional, thermomechanically coupled, finite element formulation. The influence of frictional conditions with the tool pin and shoulder on the flow in the through-thickness direction was examined in terms of their impact on the evolving crystallographic texture. Trends in regard to the strengthening and weakening of the texture are discussed in relation to the relative magnitudes of the deformation rate and spin. Finally, the computed textures are compared to electron backscatter diffraction measurements and are discussed with respect to distributions along orientational fibers and the dominant texture components along the fibers.

Overview of Texture Evolution during Friction Stir Welding of Stainless Steel Using Crystal Plasticity and EBSD

2007 ◽  
Vol 550 ◽  
pp. 479-484 ◽  
Author(s):  
Jae Hyung Cho ◽  
Donald E. Boyce ◽  
Paul R. Dawson
Keyword(s):  
Stainless Steel ◽  
Friction Stir Welding ◽  
Crystal Plasticity ◽  
Texture Evolution ◽  
Three Dimensional ◽  
Friction Stir ◽  
Tool Shoulder ◽  
Eulerian Formulation ◽  
Material Points ◽  
Tool Pin

Texture evolution during friction stir welding of stainless steel was investigated using both predictions by crystal plasticity and EBSD measurements. Two- and three-dimensional Eulerian formulations are used to model friction stir welding. Plane strain deformation is assumed in a two-dimensional model, and an initial uniform texture changes into a torsion texture with monoclinic sample symmetry after deformation. Around the tool pin, the texture strengthens, weakens and restrengthens repeatedly. It is found from a simple circular streamline model that the relative magnitudes of the deformation rate and spin along the streamlines decide textural stability. In order to consider more complicated material behaviors, such as movement along the thickness direction due to a threaded tool pin and a tool shoulder, a three-dimensional Eulerian formulation is also implemented. Materials starting under the tool shoulder travel down to the bottom, producing the longest material streamlines. Those material points are predicted to have stronger texture components than others. EBSD results are compared with the predictions.

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