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Low Cycle Fatigue Behavior of Butt-Welded Joints Experiments and Numerical Simulations

Lang, Eliane and Rudolph, Jürgen and Beier, Heinz Thomas and Vormwald, Michael (2013):
Low Cycle Fatigue Behavior of Butt-Welded Joints Experiments and Numerical Simulations.
In: 3rd International Conference of Engineering Against Failure, ICEAF III, Kos, Greece, 26.-28.06.2013, [Conference or Workshop Item]

Abstract

This contribution deals with the low cycle fatigue behavior of butt-welded joints of austenitic stainless steel (Type 347). The objective is to quantify the influence of the geometrical notch and the material inhomogeneity of a butt weld on the fatigue life at high elastic-plastic strain levels. Based on fatigue tests with butt-welded specimens – accompanying numerical simulations reveal the local strains and enable the quantification of these influences – provided that the specimens are modeled with utmost precision. Therefore, the model is based on 3D scans with a very high resolution. A comparison between the calculated and the measured strains shows that this model is capable of covering the geometrical influences. Subsequently, significant geometric parameters are transferred to an idealized model. In order to consider the weld inhomogeneity, in addition, the model is partitioned in several material zones based on hardness measurements. These measurements disclose the complex material behavior – hardening and softening of the material. A comparison of the Wöhler curves and the strain distribution demonstrates the potentialities and the problems of this procedure.

Item Type: Conference or Workshop Item
Erschienen: 2013
Creators: Lang, Eliane and Rudolph, Jürgen and Beier, Heinz Thomas and Vormwald, Michael
Title: Low Cycle Fatigue Behavior of Butt-Welded Joints Experiments and Numerical Simulations
Language: English
Abstract:

This contribution deals with the low cycle fatigue behavior of butt-welded joints of austenitic stainless steel (Type 347). The objective is to quantify the influence of the geometrical notch and the material inhomogeneity of a butt weld on the fatigue life at high elastic-plastic strain levels. Based on fatigue tests with butt-welded specimens – accompanying numerical simulations reveal the local strains and enable the quantification of these influences – provided that the specimens are modeled with utmost precision. Therefore, the model is based on 3D scans with a very high resolution. A comparison between the calculated and the measured strains shows that this model is capable of covering the geometrical influences. Subsequently, significant geometric parameters are transferred to an idealized model. In order to consider the weld inhomogeneity, in addition, the model is partitioned in several material zones based on hardness measurements. These measurements disclose the complex material behavior – hardening and softening of the material. A comparison of the Wöhler curves and the strain distribution demonstrates the potentialities and the problems of this procedure.

Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute of Steel Constructions and Material Mechanics > Fachgebiet Werkstoffmechanik
13 Department of Civil and Environmental Engineering Sciences > Institute of Steel Constructions and Material Mechanics
13 Department of Civil and Environmental Engineering Sciences
Event Title: 3rd International Conference of Engineering Against Failure, ICEAF III
Event Location: Kos, Greece
Event Dates: 26.-28.06.2013
Date Deposited: 02 Jul 2014 12:00
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