Accession Number : ADA580124


Title :   Computational Analysis of Material Flow During Friction Stir Welding of AA5059 Aluminum Alloys


Descriptive Note : Journal article


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD SURVIVABILITY MATERIALS BRANCH


Personal Author(s) : Grujicic, M ; Arakere, G ; Pandurangan, B ; Ochterbeck, J M ; Yen, C ; Cheeseman, B A ; Reynolds, A P ; Sutton, M A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a580124.pdf


Report Date : Jan 2011


Pagination or Media Count : 21


Abstract : Workpiece material flow and stirring/mixing during the friction stir welding (FSW) process are investigated computationally. Within the numerical model of the FSW process, the FSW tool is treated as a Lagrangian component while the workpiece material is treated as an Eulerian component. The employed coupled Eulerian/Lagrangian computational analysis of the welding process was of a two-way thermo-mechanical character (i.e., frictional-sliding/plastic-work dissipation is taken to act as a heat source in the thermal energy balance equation) while temperature is allowed to affect mechanical aspects of the model through temperature-dependent material properties. The workpiece material (AA5059, solid-solution strengthened and strain-hardened aluminum alloy) is represented using a modified version of the classical Johnson-Cook model (within which the strain-hardening term is augmented to take into account for the effect of dynamic recrystallization) while the FSW tool material (AISI H13 tool steel) is modeled as an isotropic linear-elastic material. Within the analysis, the effects of some of the FSW key process parameters are investigated (e.g., weld pitch, tool tilt-angle, and the tool pin-size). The results pertaining to the material flow during FSW are compared with their experimental counterparts. It is found that, for the most part, experimentally observed material-flow characteristics are reproduced within the current FSW-process model.


Descriptors :   *ALUMINUM ALLOYS , *FLOW , *FRICTION WELDING , ALGORITHMS , COMPUTATIONS , MECHANICAL PROPERTIES , THERMAL PROPERTIES


Subject Categories : Properties of Metals and Alloys


Distribution Statement : APPROVED FOR PUBLIC RELEASE