An analysis of wrinkling limit diagrams of aluminum alloy 5005 annealed at different temperatures

This paper deals with the wrinkling limit diagrams for Aluminum alloy 5005 sheets having thickness of 2.00 mm annealed at four different temperatures namely 200°C, 300°C, 400°C and 500°C. The study pertains to deep drawing into cylindrical cups through conical die using a flat bottom punch. It is proved by these researchers and others that the onset of wrinkling takes place when the ratio of strain increments (der / deθ) or the ratio of strain (er / eθ) reaches a critical value during the drawing process. These values which could be determined experimentally over which the wrinkling takes place, is shown in the form of wrinkling limit diagrams for the above grade at different annealing temperature. An attempt is also made to develop the wrinkling theory that predicts the wrinkling based on results obtained in the form of wrinkling limit diagrams established for the above grade at different annealed temperature. Further it has been observed from the stress ratio that there is a clear curve, that separates the region from safe and the wrinkling region. Further it was observed that the annealed sheets having high n-value, high R-value and high UTS /σy ratio improve the resistance against wrinkling.