identifyig-dynamic-fatigue-in-metal-sheet-partsExhaust pipe with typicaldynamic fatigue damage Dynamic fatigue in thin-walled metal sheet constructions hastypical damage symptoms withbranching cracks and laminarsections of material breaking outThe sheet thickness goes into the wall stiffness exponentially. Changing the wall thickness changes the eigenfrequencies. The same excitement forces generate different elastic deformations and stresses. Prescribed thickness tolerances for sheet metal parts mustalways be adhered to, especially in clamping zones!Local cross-section weakening inthe dynamically highly-stressed(clamping) zoneThinner beam with considerablylower stiffness and a lowereigenfrequencyBeam with less stiffness and considerably lowereigenfrequencyBending beamfor comparisonAll depicted cases concern bending beams with square cross-sections and equalconstant width.