Settings

Now showing1 - 5 of 5
  • Some of the metrics are blocked by your 
    consent settings
    Item type:Publication, Access status: with files ,
    Fracture mechanics simulation of welded joints at sub-zero temperatures considering the weld shape
    (2022-01-27)
    Sanhen, Nils-Erik
    Welded joints are the most common method for connecting steel components, but they are also points of weakness, as they contain, among other things, initial cracks or are unwelded gaps. Most of the fatigue life of a welded joints takes place during the phase of macro crack growth, fracture mechanics models are therefore widely used method to predict the fatigue life. In this thesis, a procedure is developed how fracture mechanics simulations can be conducted automatically for a large number of welded joints with heterogeneous geometries. Therefore, an integrated procedure is developed in which parametric simulation models are generated, fracture mechanically analysed and the results together with their metadata are saved in a selectable master file. Then, the fatigue lives are calculated from the numerical results via the Paris-Erdogan equation and compared with the experimentally determined data. It is shown that by adapting the Paris-Erdogan parameters, high accuracy can be achieved in predicting fatigue lives under sub-zero temperatures. Moreover, a method is described in which a low effort verification of the Paris-Erdogan parameters C and m, separately from each other, by comparing numerical and experimental fatigue lives in a logarithmic space.
    Publicationtype: Master Thesis
      59  111
  • Some of the metrics are blocked by your 
    consent settings
    Item type:Publication, Access status: with files ,
      94  211
  • Some of the metrics are blocked by your 
    consent settings
    Item type:Publication, Access status: with files ,
      172  529
  • Some of the metrics are blocked by your 
    consent settings
    Item type:Publication, Access status: with files ,
    Statistical assessment of post-weld treated welded joints by burr grinding
    (2020-05)
    Wang, Xiru
    ;
    Ehlers, Sören
    Burr grinding is one of the post-weld improvement methods that are widely used in various industries to improve the fatigue strength of welds: bridges, offshore structures, ships and land-based structures. In this paper, main influencing parameters and effect of burr grinding technique on the fatigue strength for butt-welded, longitudinal welded, doubling plates, load-carrying transverse, non-load carrying transverse welded and T-joints as well as I-section with cope hole and out-of-plane longitudinal welds has been evaluated, based on the extracted 395 fatigue data points from 34 existing publications. The specimens used in these studies with yield strength 175 MPa < σYS <1100 MPa, which were tested with stress ratio -1 < R < 0.5, are analyzed and assessed with statistical methods. The assumed value of S-N slope m = 4 and proposed FAT classes seem to be applicable for the extracted data. More experimental testing is needed to draw the conclusion more exactly.
    Publicationtype: Bachelor Thesis
      162  454
  • Some of the metrics are blocked by your 
    consent settings
    Item type:Publication, Access status: with files ,
      79  536