An assembly comprising two parts temporarily connected by a connecting element surrounding the assembly. The connecting element being subjected to an internal deformation stress. The assembly having stress-keeping means with controlled stress relief, which connect two opposite ends of the connecting element so as to counteract the internal deformation stress. The assembly includes attaching means for attaching the connecting element to each of the parts. The attaching means includes at least two layers of cured adhesive which respectively coat the parts and make a surface connection between each of these parts and the connecting element. The internal deformation stress is at a sufficient level to enable the connecting element to be unsecured from the parts by extending to a rest position, when the stress-keeping means are controlled so as to release the ends of the connecting element.