Fracture analysis of tensile- and fatigue failure for perforated and wedge wire structures

Sammanfattning

In the effort to produce more durable filters and understand their mechanical failure, this study presents distinctive indicators on the cause of failure for welded perforated- and wedge wire sheets in 316L stainless steel, super duplex UR52N stainless steel and grade 2 titanium. The study achieves this by fracture analysis on specimens from tensile strength- and fatigue testing. These tests are performed to an extent to ensure the highest authenticity and accommodate for the loads and strains on the actual filter structure. The fractured specimens are analysed using industrially applicable methods. The analysis shows numerous macro and microscopical indicators differentiating between tensile- and fatigue fractures. Observable in the materials are, among other things, distinctions in cracking and void formations. The study shows that a subsequent conclusion to the type of failure a fractured filter has exhibited is achievable with these indicators. Through these conclusions, the study contributes to developing more durable filters and a more comprehensive understanding of the failure of welded perforated and wedge wire sheets.