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2 Fatigue of Aircraft Structures

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Sensitivity Analysis of the Nasgro Equation Based on the PZL-130 TC-II Orlik Trainer Aircraft Full Scale Fatigue Test

Reymer Piotr, Leski Andrzej, Kurdelski Marcin

Fatigue of Aircraft Structures

2022

Iss. 14

8--17

The study investigates the sensitivity of numerical crack propagation estimations based on the Nasgro equation. The equation is widely used for crack propagation calculations since it considers the whole range of crack propagation speed from threshold to critical values of stress intensity factor range (∆K). The presented investigation is based on the actual results of the full scale fatigue test (FSFT) of the PZL-130 ‘Orlik’ TC-II aircraft. We provide a brief description of the test and the general approach followed in crack propagation estimations originally carried out after the test. The obtained results are verified in terms of variation of the input data. Overall results are compared and discussed.

Mi-24 Helicopter Full Scale Fatigue Test Concept

Reymer Piotr, Zieliński Wojciech, Piątkowski Łukasz, Dziendzikowski Michał, Kurnyta Artur, Wrąbel Rafał, Cichocki Tomasz, Leśniczak Andrzej, Kurdelski Marcin, Dragan Krzysztof

Fatigue of Aircraft Structures

2019

Iss. 11

11--18

This paper presents a general concept of the Full Scale Fatigue Test of the Mi-24 helicopter including the test layout and load distribution, as well as describes the milestones to be achieved. Additionally, some initial work conducted in order to determine both the mass and load distribution in the structure is described. The main goal of the test is to verify the low cycle fatigue life of the helicopter structure (fuselage, tail boom, wings and landing gear). The test will be divided into two main stages at which flight and landing loads will be applied. The authors demonstrate the general test concept, the helicopter’s structure fixture and the arrangement of the hydraulic actuators at both stages in order to achieve representative loads during the test. The proposed concept is based on AFIT’s previous experience in full scale structural testing, available literature and the experience of the test staff.