Extrusion Press Fatigue Failure

To investigate the fatigue crack propagation phenomenon affecting the main cylinder of an extrusion press for aluminum sections. The crack had propagated through the thickness, causing a leakage of the pressurized oil and consequent production stop. The fatigue load was induced by the pressure variation inside the cylinder from 0 to 300 bar for each cycle, as needed to push each section of material through the extrusion hole