%0 conference object
%@ 
%A Herrnring, J.,Kashaev, N.,Klusemann, B.

%D 2017
%J Book of Abstracts, 88th GAMM Annual Meeting 2017
%N 
%P 265 

%T Finite element modeling of laser beam welding for residual stress calculation
%U 
 
%X Laser beam welding is a widely used joining process in industrial application. Within the,process a highly inhomogeneous temperature field in the joined materials is generated,,which causes changes in mechanical properties, residual stresses and component distortion.,The high temperatures in the liquid pool and in the heat-affected zone lead to a,severe change in material microstructure. The mechanical properties depend strongly,on the microstructure and change therefore dramatically in the fusion- and heat-affected,zone compared to the properties in the base material.,This work determines the residual stress field in a butt joined, precipitation hardened,aluminum alloy via a phenomenological continuum model. The material behavior is,defined by a thermomechanical material model, which changes the behavior from viscoplastic,below the solidus temperature to a pure viscous behavior above the liquidus,temperature. A mixed finite element formulation is used to ensure incompressible,material behavior above the melting temperature. The temperature field is described,based on the heat conduction equation in combination with a three-dimensional Gaussian,power distribution. The temperature field is solved by a semi analytical solution which,utilizes the method of Greens- Functions. As a consequence of the severe change,of mechanical properties based on the dissolution of precipitations a kinetic model is,used, which describes the dissolution of precipitations. Residual stresses of butt welded,specimens are measured with synchrotron x-rays and compared with the numerically,determined stress fields.