In fact, increasing the pre-strain prior to ageing leads to a reduction in the strengthening provided by the T 1 phase, in favour of an increase in the strain hardening contribution.Īn aspect of relevant importance for these materials is the possibility of manufacturing aeronautic components of complex geometry. At the maximum pre-strain level before plastic instability (15%), YS increased to ~670 MPa and ductility decreased to 7.5% in the T8 condition. Recently, Rodgers and Prangnell have investigated the effect of increasing the pre-stretching of the Al-Cu-Li alloy AA2195 to higher levels than those currently used in industrial practice, focussing the attention on the behavior of the T 1 phase. The stretching of a tapered plate leads to a strain gradient, and it is necessary to know the maximum strain that can be achieved without fracture. Moreover, stretching prior to ageing is connected to a relevant technological problem: today, advances in rolling technology enable the production of plates with desired thickness, which is of great interest for manufacturing near-net-shape sections (e.g., tapered wing skins).
0 Comments
Leave a Reply. |