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RESEARCH PAPER
Improvement of fatigue life of riveted joints in helicopter airframes
 
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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
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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ISSN:1507-2711
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