The present investigation focuses on the application of micromechanica
l material modeling by means of the modified Gurson model to determine
the deformation and fracture behavior of aluminum weldments. In order
to predict the material behavior, a set of material parameters associ
ated with formation and coalescence of voids was established for the d
ifferent zones in a weld. The material parameters of various positions
in the heat-affected zones were determined for two different aluminum
alloys, one 6005 alloy and one 6082 alloy, using weld thermal simulat
ed material. The results from numerical simulations of welded wide pla
tes showed that the deformation and fracture characteristics: can be p
redicted fairly well by using the established damage mechanics methodo
logy.