Central Aerohydrodynamic Institute
RUS
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Fatigue strength laboratory

Basic parameters

Test hall dimensions: 75.0 x 90.0 x 25.4 m
Reinforced floor 5700 m2
Acceptable loading on reinforced floor 37500 t
Power capacity 3600 kW
Compressed air consumption with 6 ati pressure 37 m3s
Oil-pump station capacity under 200 ati pressure 5000 I/min
Recycling water supply under 1.5 kg/sm2 pressure 64 m3/h
Channels number 500
Frequency range 0.1...30 Hz
Measurement accuracy (not less) 1 %
Measurement channels number 1500
Measurement acquisition rate 5000 measurements/s
Measurement accuracy (not less) 1 %

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General description

The laboratory is intended for full-scale structures fatigue strength investigations. The structure loading is realized by multichannel electric hydraulic servo system with digital control. The measurements of the relative deformations, bandings, shears, forces, pressures, temperatures are performed by fast multipoint information-measurement systems. The structure health monitoring systems (ultra-sound, eddy-current, acoustic-emission, built-in, optical with endoscope) and automated continuous monitoring systems are applied for structure damages detection and crack propagation monitoring. The laboratory stands enable investigation of all the aircraft glider components simultaneously by cyclical loading via 120 channels and measurement of overpressure value.


Capabilities

Fatigue strength laboratory allows to perform the following types of investigations: 
  • fatigue; 
  • residential strength; 
  • system functional check; 
  • vibrational; 
  • structure stressed-deformed state; 
  • structure fatigue cracks propagation; 
  • calibration of strain-gages applied on the structure; 
  • analysis and monitoring of inaccessible zones of the structure.


Technological advantages

  • Full-scale aircraft structure with taking-off mass upto 500 t with simultaneous loading of all glider components (wing, fuselage, empennage, landing gear, engine mounting) as the layout of the generic aircraft; 
  • Simulation of flight loading programs with quasi-random loads and flights alternation; 
  • Vibrational loading via electric hydraulic monitoring system controlled by a computer; 
  • Acoustic-emission structure control in a real-time mode.


Practical application

Fatigue strength of full-scale passenger, transport, military aircraft and helicopters, pipeline systems and machinery structures. The laboratory is certified by State Certification Authority (Gosstandart) and International Aviation Committee. Certificate of II-0002 accreditation for the following fatigue tests is received: 
  • aviation structures; 
  • wind-driven power plant; 
  • pipeline systems.