|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Failure, and a Career That is Anything But: An LMD Symposium Honoring J. Wayne Jones
||Tear Resistance of AA7075-T6 Sheet at Room Temperature and 200 °C
||Daniel Nikolai, Eric M. Taleff
|On-Site Speaker (Planned)
The tear resistance of AA7075-T6 sheet material was measured at 25 and 200 °C to better understand rupture limited deformation. AA7075-T6 has very limited ductility at room temperature but exhibits increased ductility at 200 °C, for which the stamping of a complex geometry was demonstrated. Tear energies were measured for displacement rates that ranged from 2 mm/min up to 1024 mm/min for tests at 200 °C. Tear propagation energies increased by a factor of ten from 25 to 200 °C. Tear propagation energies at 200 °C decreased exponentially with increasing displacement rate. The direction of tearing influenced tear resistance, with the greater tear resistance along the transverse to the sheet rolling direction. Increased tear resistance at 200 °C is associated with a reduction in flow stress and increased ductility that transitions tearing from shearing fracture at 25 °C to ductile tearing with significant neck development at 200 °C.