@misc{LaunertRhodeKrommetal., author = {Launert, Benjamin and Rhode, Michael and Kromm, Arne and Pasternak, Hartmut and Kannengießer, Thomas}, title = {Measurement and numerical modeling of residual stresses in welded HSLA component-like I-girders}, series = {Welding in the World}, volume = {61}, journal = {Welding in the World}, number = {2}, issn = {0043-2288}, doi = {10.1007/s40194-016-0413-x}, pages = {223 -- 229}, abstract = {The present contribution shows the residual stress results obtained from experiments with the sectioning method in comparison to global (structural) welding simulation models on component-like (i.e., large scale) I-girders made of structural steel grades S355 and S690QL. Plates were welded by conventional gas metal arc welding using two different heat inputs. In addition, the base material was assumed to be approximately stress-free. Based on these results, conclusions and recommendations for the design of welded I-girders are drawn.}, language = {en} } @techreport{LaunertPasternakRhodeetal., author = {Launert, Benjamin and Pasternak, Hartmut and Rhode, Michael and Kromm, Arne and Kannengießer, Thomas}, title = {Erh{\"o}hung der Tragf{\"a}higkeit geschweißter I-Tr{\"a}ger aus hochfestem Baustahl durch verbesserte Ans{\"a}tze zur Ber{\"u}cksichtigung von Eigenspannungen}, pages = {4}, language = {de} } @misc{ScharfWildenhainHaelsigHaerteletal., author = {Scharf-Wildenhain, Ronny and H{\"a}lsig, Andr{\´e} and H{\"a}rtel, Sebastian and Wandtke, Karsten and Schr{\"o}pfer, Dirk and Kromm, Arne and Kannengießer, Thomas}, title = {Einfluss der W{\"a}rmef{\"u}hrung auf die Eigenschaften und fertigungsbedingten Beanspruchungen additiv geschweißter hochfester Feinkornbaust{\"a}hle}, series = {42. Assistentenseminar F{\"u}getechnik}, journal = {42. Assistentenseminar F{\"u}getechnik}, publisher = {DVS Media GmbH}, address = {D{\"u}sseldorf}, isbn = {978-3-96144-210-2}, pages = {94 -- 101}, language = {de} } @inproceedings{KrommRhodeLaunertetal., author = {Kromm, Arne and Rhode, Michael and Launert, Benjamin and Dixneit, Jonny and Kannengießer, Thomas and Pasternak, Hartmut}, title = {Combining Sectioning Method and X-Ray Diffraction for Evaluation of Residual Stresses in Welded High Strength Steel Components}, series = {Residual Stresses 2016 - ICRS-10}, booktitle = {Residual Stresses 2016 - ICRS-10}, editor = {Holden, Thomas M. and Mur{\´a}nsky, Ondrej and Edwards, Lyndon}, publisher = {Materials Research Forum LLC}, address = {Millersville, PA}, isbn = {978-1-94529116-6}, doi = {10.21741/9781945291173-28}, pages = {163 -- 168}, abstract = {Residual stresses and distortions in welded I-girders for steel construction are relevant when evaluating the stability of steel beams and column members. The application of high strength steels allows smaller wall thicknesses compared to conventional steels. Therefore, the risk of buckling has to be considered carefully. Due to the lack of knowledge concerning the residual stresses present after welding in high strength steel components conservative assumptions of their level and distribution is typically applied. In this study I-girders made of steels showing strengths of 355 MPa and 690 MPa were welded with varying heat input. Due to the dimension of the I-girders and the complex geometry the accessibility for residual stress measurement using X-ray diffraction was limited. Therefore, saw cutting accompanied by strain gauge measurement has been used to produce smaller sections appropriate to apply X-ray diffraction. The stress relaxation measured by strain gauges has been added to residual stresses determined by X-ray diffraction to obtain the original stress level and distribution before sectioning. The combination of both techniques can produce robust residual stress values. From practical point of view afford for strain gauge application can be limited to a number of measuring positions solely to record the global amount of stress relaxation. X-ray diffraction can be applied after sectioning to determine the residual stresses with sufficient spatial resolution.}, language = {en} } @inproceedings{LaunertRhodeKrommetal., author = {Launert, Benjamin and Rhode, Michael and Kromm, Arne and Pasternak, Hartmut and Kannengießer, Thomas}, title = {Residual Stress Influence on the Flexural Buckling of Welded I-Girders}, series = {Residual Stresses 2016 - ICRS-10}, booktitle = {Residual Stresses 2016 - ICRS-10}, editor = {Holden, Thomas M. and Mur{\´a}nsky, Ondrej and Edwards, Lyndon}, publisher = {Materials Research Forum LLC}, address = {Millersville, PA}, isbn = {978-1-94529116-6}, doi = {10.21741/9781945291173-19}, pages = {109 -- 114}, abstract = {The nonlinear analysis became a common tool to precisely assess the load-bearing behavior of steel beam and column members. The failure level is significantly influenced by different types of imperfections, among geometric also structural imperfections (residual stresses). Here are still gaps in the knowledge. Nowadays, 3-D welding simulation developed to a level where it could provide reliable estimation of weld-induced distortion and residual stresses. Nevertheless, modelling and computational effort are still in a less practicable range. In this study a simplified procedure to implement residual welding stresses in continuous large scale members is proposed and the influence on the ultimate limit state of slender members in compression is evaluated for two common structural steel grades. The results showed significant improvements in the utilization of load bearing capacity compared with simplified design methods. The comparatively general approach in this study offers potential for future optimization.}, language = {en} }