TY - GEN A1 - Xu, Ping T1 - Simple but Effective - a Mechanical Methode to Improve the Fatigue Behaviour of Spot Welded High-Strength Steels T2 - The 3rd International Seminar on Advances in Resistance Welding N2 - Substantial improvement in the fatigue strength of spot welded high-strength steels has been achieved with the help of a mechanical method, i. e. preloading. Fatigue tests of preloaded tensile shear specimens made from the material H280LA have revealed that their S/N-curves, compared to those of non-preloaded specimens, are not only located at elevated positions, but have flatter slope, too. Low cycle fatigue tests of the triple-spot weld tensile shear specimens examined yielded an increase in fatigue strength of around 50 %. Due to preloading, the notch zones in the spot welded area undergo plastic deformation as a result of high notch stresses. After specimen unloading, compressive stresses arise in this area involving a beneficial specimen behaviour under the load imposed in subsequent fatigue testing, thus causing delayed crack initiation in the spot weld area. T2 - The 3rd International Seminar on Advances in Resistance Welding CY - Berlin, Germany DA - 2004-11-16 PY - 2004 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/4750 AN - OPUS4-4750 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany