TY - JOUR

T1 - Experimental and Numerical Investigations of the Deep Rolling Process to Analyze the Local Deformation Behavior of Welded Joints

AU - Heikebrügge, Steffen

AU - Breidenstein, Bernd

AU - Bergmann, Benjamin

AU - Dänekas, Christian

AU - Schaumann, Peter

N1 - Funding Information: This research was funded by the German Federation of Industrial Research Assosciations (AiF), grant numbers 20626/N and 21496/N and the ?Sieglinde Vollmer Stiftung?. The authors thank the German Federation of Industrial Research Associations (AiF) for the financial support of the project ?Deep rolled welds?Increased fatigue strength of welded joints in wind energy by deep rolling?, grant number 20626/N, and the project ?Fatigue strength of butt joints of high-strength fine-grained offshore construction steels with and without post-treatment for the construction of offshore wind turbines?, grant number 21496/N. Both projects are part of the program for promoting industrial cooperative research (IGF) based on a decision by the German Bundestag. The projects were initiated and are organized by the Research Association for Steel Application (FOSTA). Additionally, the authors would like to thank the ?Sieglinde Vollmer Stiftung? for the financial support of this research work.

PY - 2022/6

Y1 - 2022/6

N2 - Welded joints show a comparably low fatigue strength compared to the base material. Thus, different post-weld treatment methods are used to enhance the fatigue strength of welded joints. A promising method to enhance the fatigue strength of metallic components is the deep rolling process, but this has rarely been applied to welds. For the qualification of the deep rolling process as an effective post-weld treatment method, knowledge about its influence on the surface and subsurface properties at the fatigue critical weld toe is necessary. Here, geometrical and metallurgical inhomogeneities lead to complex contact states between deep rolling tools and weld toes. Thus, for a first analysis of the local deformation behavior during deep rolling of welded joints, experimentally and numerically generated deep rolling single tracks are compared. Cyclic strain-controlled tests to determine the material behavior were carried out for the numerical analyses using finite element simulation. The presented study shows that it is possible to describe the local deformation of welded joints during deep rolling using finite element simulation. A correct depiction of material behavior is crucial for such an analysis. It was shown that certain irregularities in material behavior lead to lower coincidences between simulation and experiment, especially for the investigated welds, where only low differences in hardness between base material, heat-affected zone, and filler material were found.

AB - Welded joints show a comparably low fatigue strength compared to the base material. Thus, different post-weld treatment methods are used to enhance the fatigue strength of welded joints. A promising method to enhance the fatigue strength of metallic components is the deep rolling process, but this has rarely been applied to welds. For the qualification of the deep rolling process as an effective post-weld treatment method, knowledge about its influence on the surface and subsurface properties at the fatigue critical weld toe is necessary. Here, geometrical and metallurgical inhomogeneities lead to complex contact states between deep rolling tools and weld toes. Thus, for a first analysis of the local deformation behavior during deep rolling of welded joints, experimentally and numerically generated deep rolling single tracks are compared. Cyclic strain-controlled tests to determine the material behavior were carried out for the numerical analyses using finite element simulation. The presented study shows that it is possible to describe the local deformation of welded joints during deep rolling using finite element simulation. A correct depiction of material behavior is crucial for such an analysis. It was shown that certain irregularities in material behavior lead to lower coincidences between simulation and experiment, especially for the investigated welds, where only low differences in hardness between base material, heat-affected zone, and filler material were found.

KW - deep rolling

KW - finite element simulation

KW - material modeling

KW - welded joints

UR - http://www.scopus.com/inward/record.url?scp=85129522455&partnerID=8YFLogxK

U2 - 10.3390/jmmp6030050

DO - 10.3390/jmmp6030050

M3 - Article

AN - SCOPUS:85129522455

VL - 6

JO - Journal of Manufacturing and Materials Processing

JF - Journal of Manufacturing and Materials Processing

IS - 3

M1 - 50

ER -