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Numerical Simulations based on Scans and Experimental Data for Low Cycle Fatigue Assessment

Lang, Eliane and Beier, Heinz Thomas and Vormwald, Michael and Rudolph, Jürgen (2012):
Numerical Simulations based on Scans and Experimental Data for Low Cycle Fatigue Assessment.
In: ANSYS Conference & 30th CADFEM User's Meeting, Kassel, Deutschland, 24.-26.11.2012, [Conference or Workshop Item]

Abstract

The research dealed with in this contribute targets a new approach to enable low cycle fatigue assessment of welded components. The fatigue behavior of weld seams – especially the fatigue relevant influence of geometrical and metallugical notches – is of particular interest in this context. The approach is based on material mechanics and constitutes a combination of experimental findings and numerical simulations in order to consider the particularities of of the fatigue behavior of the weld seam in more detail. Experiments on welded specimens provide the fatigue life and the failure location as well as the stabilized cyclic stress-strain curve as relevant input parameters for the subsequent FE analyses. FE calculation of the specimen determines the fatigue relevant strain at the failure location. Moreover, the FE calculation will be able to indicate the failure location if modeled with the highest precision outputting damage parameters and considering the different material resistances. The proposed model is capable of considering the exact geometry of the weld seam obtained by 3D scanning with very high resolution and the different material strengths due to the weld. The consideration of the principal influences on the fatigue behavior of weld seams paves the way to the application of established damage parameters such as PJ with the future objective to transfer the results also on arbitrary proportional and non-proportional loadings with variable amplitudes.

Item Type: Conference or Workshop Item
Erschienen: 2012
Creators: Lang, Eliane and Beier, Heinz Thomas and Vormwald, Michael and Rudolph, Jürgen
Title: Numerical Simulations based on Scans and Experimental Data for Low Cycle Fatigue Assessment
Language: English
Abstract:

The research dealed with in this contribute targets a new approach to enable low cycle fatigue assessment of welded components. The fatigue behavior of weld seams – especially the fatigue relevant influence of geometrical and metallugical notches – is of particular interest in this context. The approach is based on material mechanics and constitutes a combination of experimental findings and numerical simulations in order to consider the particularities of of the fatigue behavior of the weld seam in more detail. Experiments on welded specimens provide the fatigue life and the failure location as well as the stabilized cyclic stress-strain curve as relevant input parameters for the subsequent FE analyses. FE calculation of the specimen determines the fatigue relevant strain at the failure location. Moreover, the FE calculation will be able to indicate the failure location if modeled with the highest precision outputting damage parameters and considering the different material resistances. The proposed model is capable of considering the exact geometry of the weld seam obtained by 3D scanning with very high resolution and the different material strengths due to the weld. The consideration of the principal influences on the fatigue behavior of weld seams paves the way to the application of established damage parameters such as PJ with the future objective to transfer the results also on arbitrary proportional and non-proportional loadings with variable amplitudes.

Uncontrolled Keywords: Low cycle fatigue behaviour, weld, scan based modelling
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: ANSYS Conference & 30th CADFEM User's Meeting
Event Location: Kassel, Deutschland
Event Dates: 24.-26.11.2012
Date Deposited: 02 Jul 2014 12:00
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