Schwingfestigkeit von Schweißverbindungen aus der Aluminiumlegierung AlMg 4,5 Mn (AA5083) nach dem Konzept der Mikrostützwirkung

For the calculation of the fatigue strength of welded joints in aluminium the micro-support approach of Neuber was applied. Fatigue tests with unnotched and notched specimens of the base and weld metal (deposite) of AlMg4.5Mn (AA5083) were carried out in order to derive the unknown microsupport length in dependency on the number of cycles. For the application of the concept, results of fatigue tests with geometrical similar welded joints with full and partial penetration were available, for which stress concentration factors had been calculated. The comparison of the experimental and calculated fatigue strength shows that the endurance strength is well assessed. An expansion of the concept to lower numbers of cycles is possible.