Hello firends, Please help me for the firction stir analysis in ansys..
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ansys tutorial related to friction stir welding
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Hello firends, Please help me for the firction stir analysis in ansys..
09-03-2017, 11:26 AM
Friction stir welding(FSW) is a solid state bonding process that uses a non-consumable tool to join two work pieces that face without melting the workpiece material. The heat is generated by friction between the rotating tool and the workpiece material, which leads to a smoothed region near the FSW tool. While the tool is traversed along the joining line, it mechanically intermixes the two pieces of metal, and forges the hot and smoothed metal by the mechanical pressure, which is applied by the tool, as do the joining of the clay, or mass. It is mainly used in forged or extruded aluminum and particularly for structures which require a very high weld resistance.
Historical Background and Principles
Radically new joining processes do not occur very often: friction welding (FSW) was one such event, invented by the TWI in 1991. Since then, research and development in FSW and associated technologies has multiplied, With many companies, research institutes and Universities invest heavily in the process and the international conferences dedicated to their study. By the end of 2007, TWI had issued 200 licenses for the use of the process, and 1900 patent applications related to FSW had been filed. The number of research papers has also grown exponentially.
A rotating tool is pressed against the surface of two plates that are supported or overlapped. The side of the weld for which the rotary tool moves in the same direction as the direction of displacement is commonly known as the "advancing side"; The other side, where the rotation of the tool opposes the direction of displacement, is known as the "recoil side" †. An important feature of the tool is a probe (bolt) protruding from the base of the tool (the shoulder), and is only marginally less than the thickness of the plate. Heat of friction is generated, mainly due to the high normal pressure and the cutting action of the shoulder. Friction stir welding can be considered as a constrained extrusion process under the action of the tool. Friction heating causes a softened area of material to form around the probe. This softened material can not escape, as it is limited by the tool shoulder. As the tool is traversed along the attachment line, the material is swept around the tool probe between the withdrawing side of the tool (where local movement due to rotation opposes forward movement) And the surrounding non-deformed material. The extrudate is deposited to form a solid phase gasket behind the tool. The process is by definition asymmetric, since most of the deformed material is extruded beyond the withdrawal side of the tool. The process produces very high stresses and deformation rates, both of which are substantially higher than those encountered in other solid state metal working processes (extrusion, rolling, forging, etc.).
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