TY - JOUR

T1 - Multiscale process simulation of residual stress fields of laser beam welded precipitation hardened AA6082

AU - Herrnring, Jan

AU - Staron, Peter

AU - Kashaev, Nikolai

AU - Klusemann, Benjamin

PY - 2018/11

Y1 - 2018/11

N2 - In this study, a multiscale modelling approach for the determination of residual stresses for the laser beam welded, precipitation hardened aluminium alloy AA6082-T6 is presented and applied. The material behaviour is described by an elasto-visco-plastic material model, specially suited for fusion welding processes. The microstructure evolution during the welding process has a direct influence on the macroscopic mechanical properties. The modelling approach accounts for the change in the microstructure via a Kampmann–Wagner Numerical model which takes into account the kinetics of the precipitates. The macroscopic mechanical properties are determined via classic dislocation theory, which accounts for the interaction between dislocations and precipitates. The temperature field of the welding process is described by a highly efficient semi-analytical approach. The solution of the temperature field in connection with a three dimensional moving heat source is achieved by using the method of Green’s functions. By employing the method of Green’s functions, it is possible to reduce the numerical effort significantly. The results of this modelling approach are compared to temperature, hardness as well as residual stress measurements, obtained from synchrotron X-ray diffraction, for welded sheets to clarify the accuracy of the applied model.

AB - In this study, a multiscale modelling approach for the determination of residual stresses for the laser beam welded, precipitation hardened aluminium alloy AA6082-T6 is presented and applied. The material behaviour is described by an elasto-visco-plastic material model, specially suited for fusion welding processes. The microstructure evolution during the welding process has a direct influence on the macroscopic mechanical properties. The modelling approach accounts for the change in the microstructure via a Kampmann–Wagner Numerical model which takes into account the kinetics of the precipitates. The macroscopic mechanical properties are determined via classic dislocation theory, which accounts for the interaction between dislocations and precipitates. The temperature field of the welding process is described by a highly efficient semi-analytical approach. The solution of the temperature field in connection with a three dimensional moving heat source is achieved by using the method of Green’s functions. By employing the method of Green’s functions, it is possible to reduce the numerical effort significantly. The results of this modelling approach are compared to temperature, hardness as well as residual stress measurements, obtained from synchrotron X-ray diffraction, for welded sheets to clarify the accuracy of the applied model.

KW - Engineering

KW - Modellierung

KW - Aluminiumlegierung

KW - Laserstrahlschweißen

KW - Modelling

KW - Aluminium alloy

KW - Laser beam welding

KW - Welding

KW - Green's function

KW - Residual stresses

KW - Kampmann-Wagner numerical model

KW - Multiscale approach

UR - http://www.scopus.com/inward/record.url?scp=85059243659&partnerID=8YFLogxK

U2 - 10.1016/j.mtla.2018.08.010

DO - 10.1016/j.mtla.2018.08.010

M3 - Journal articles

VL - 3

SP - 243

EP - 255

JO - Materialia

JF - Materialia

SN - 2589-1529

ER -