Research of the sealing quality of structures with polymer composite parts at assembly and fastener installation on uncured interfay sealant

Abstract

The purpose of the paper is substantiation of the equal distribution of the sealing compound inside the hole in the stack of composite parts during the installation of basic fasteners within 20-72 hours from the preparation moment of the interfay sealant PR1782C12-M when the assembly is performed on the uncured interfay sealant without finish drilling of holes. A wing as a typical aircraft structure element, which is represented by a stack of two flat panels made of polymer composite materials, is chosen for the technological development of quality assessment of fastener installation on the interfay sealant. The carried out tests include an organoleptic assessment of the PR1782C12-M sealant condition (polymerization degree), its presence in the holes and on the stack end surfaces, and the sealant applied to the fasteners. The experiment also involves the assessment of the sealant condition and presence of the tack layer on the grip in the period of time from 20 to 72 hours from the moment of sealant preparation. The recommended process for sealant application to fasteners under assembly on the uncured sealant without finish drilling of holes is defined.