Options
1989
Conference Paper
Titel
Multiaxial fatigue of welded shaft-flange connections of stirrers under random non-proportional torsion and bending
Abstract
Multiaxial fatigue failures of welded coupling flanges of stirrers in a fertilizer plant required an investigation of the reasons for the failures and to develop an improved design. Strain measurements carried out at the shaft showed that the stirrers experienced fluctuation torsional loads due to upward and downward driving from the gearbox and bending loads due to the viscous fluid stirred by impellers at the bottom of the shafts. The analysis of this variable amplitude loading resulted in two particular cumulative frequency distributions for torsion and bending which then had to be combined to a single equivalent loading spectrum and extrapolated to the estimated period of usage. When using this spectrum for the combined multiaxial loading of the shafts and an appropriate damage accumulation hypothesis, the failures of the welds could be explained and a redesign and optimization of the shaft-flange connections achieved.
Author(s)