“…At the same time, main issue is to decrease stress concentration as much as possible along the hole outline [4,7,8,13,16,17,19,20,23]. One of the ways reducing stress concentration and obtaining their uniform distribution is installation of intermediate metal sleeve between a composite material slab and a bolt transferring loads [2,9,14,15,22]. Installation of intermediate metal sleeve without clearance reduces stress concentration: circumferential stress 4-5 times, radial stress 2-3 times.…”