RESEARCH PAPER
Improvement of fatigue life of riveted joints in helicopter airframes
1
Department of Mechatronics, Armament and Aviation, Military University of Technology, ul. gen. Sylwestra Kaliskiego 2, 00 -908 Warsaw, Poland
2
Military Centre for Standardization, Quality and Codification, ul. Nowowiejska 28a, 00-909 Warsaw, Poland
Publication date: 2021-03-31
Eksploatacja i Niezawodność – Maintenance and Reliability 2021;23(1):165-175
HIGHLIGHTS
- Titanium driven blind bolts improve fatigue life of repaired airframes of helicopters.
- Hybrid (rivet & adhesive) joints also increase fatigue life of repaired airframe.
- Better fatigue life for less rigid adhesive compound with thin layer of glass fabric.
- Proposed joints reduce the problem of secondary fatigue damage to the repaired airframe.
KEYWORDS
riveted jointshybrid jointfatigue lifetitanium driven blind bolts with pinordinarymushroom head rivets
ABSTRACT
Using original cold-formed rivets in repairs of airframes of helicopters is difficult due to no
access to inside parts of the airframe. Thus, the main aim of the study was to investigate the
possibility to use the blind rivets or hybrid joints by verification the fatigue performance
of such joints that must be better than with original rivets. Riveted and hybrid joints have
been experimentally tested under static and fatigue loads. Furthermore, numerical calculations of stress distribution for strapped joint have been conducted. The test results covered
fatigue life of lap joints and models of repaired airframe sheets using ordinary mushroom
head rivets ref. 3558A-4-10, titanium driven blind bolts with pin, ref. MBF2110AB-05-150
and modified hybrid joints. Using titanium driven blind bolts with pin instead of ordinary
hammer-bucked rivets, can improve the fatigue life of element made of aluminum alloy
AW 2024T3. There are advantages of replacing riveted joints with modified hybrid (rivet &
adhesive) joints in threefold increase in fatigue life of repaired airframe structures.
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