An actuator device based on a shape memory alloy, and a wing flap assembly fitted with such an actuator device

Device (10) actuator comprising an extended element (11) made of memory alloy form, and further comprising a frame (12) arcuate made of elastic material, to which the expansion element is fixedly connected under tension, each end (11a, 11b) of the extended element being fixed at a respective end (12a, 12b) of the frame-shaped arch in which a controlled heating of the expansion element, sufficient to enable a transformation of crystalline phase alloy shape memory, is capable of activating a contraction of the expansion element, and thus contraction of said frame-shaped bow, and a cooling of the element extended contracted, sufficient to activate an inverse transformation of the crystalline phase of the shape memory alloy, it allows the stretch arcuate frame due to elastic return; characterized in that the ends (12a, 12b) of the frame (12) arcuate are provided with elements (16a, 16b) of respective anchor for temporary assembling a tensioner (17) adapted to allow mounting of the extended element ( 11) under tension.