Reversible inter-particle bonding in SPH for improved simulation of friction stir welding

Abstract Friction stir welding (FSW) is a complex joining process which governed by multiple intertwined physical phenomena. Besides friction, inelastic heat generation, and conduction, it involves high plastic deformations, resulting in need for numerical method being able to handle all these. Such scheme smoothed particle hydrodynamics (SPH), mesh-free computational technique. Absence of fixed mesh results the ability deal with another challenge friction welding, coalescence initially separate workpieces into one due bonding mechanisms. The background this phenomenon transition from contact between two pieces continuum enormous changes several material condition, such as temperature, pressure, strain, strain rate. This work deals new development related bonding, will provide deeper understanding about weld formation during FSW. SPH framework must be extended consider mechanism. criterion definition, interaction type change, SPH–SPH formulation. Then, implementation tested different examples, compression test