Abstract
The local loads and deformations in welded joints have rarely been investigated under the aspect that the mechanical behaviour is influenced by different kinds of microstructure [1]. These different kinds of microstructure lead to multiaxial states of stresses and strains, and some investigations [2–4] have shown that for the determination of the total state of deformation of a welded joint, the locally different deformation behaviour has to be taken into account. It is also published that different mechanical properties in the heat-affected zone (HAZ) [5] as well as a weld metal with a lower strength as the base metal [6] can be the reason or the starting point of a fracture in welded joints. A new investigation demonstrates [7] that in TIG-welded joints of the high strength steel StE 690, a fine-grained area in the heat-affected zone with a lower strength than that of the base metal is exclusively the starting zone of fracture under cyclic loading in the fully compressive range. These investigations support the approach described here that the mechanical behaviour of the different kinds of microstructure in the heat-affected zone of welded joints has to be taken into account in the deformation analysis. The influences of these inhomogeneities on the local deformation behaviour of welded joints were determined by experiments and numerical calculations over a wide range of temperature and loading. The numerical deformation analysis was performed with the method of Finite Elements, in which recently developed deformation models simulate the mechanical behaviour of materials over the tested range of temperature and loading conditions.
Published Version
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