Temat: fatigue test - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: High-Temperature Fatigue Testing of Turbine Blades
Autorzy:: Kopec, Mateusz
Kukla, Dominik
Wyszkowski, Mirosław
Kowalewski, Zbigniew L.
Tematy:: fatigue
high temperature
turbine blade
full-scale fatigue test; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/55789514.pdf Link otwiera się w nowym oknie
Opis:: This paper evaluates the efficacy of a patented grip for high-temperature fatigue testing by establishing the S-N curve for full-scale nickel-based turbine blades under simulated environmental conditions. Initially, a bending test assessed the stress-displacement characteristics of the component. This was followed by a series of fatigue tests at 950°C, using cyclic bending with force amplitudes from 5.2 kN to 6.6 kN and a constant frequency of 10 Hz. The setup, integrating the grip into a standard testing machine, proved effective for high-temperature tests and successfully determined the service life of full-scale components.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Introduction of Fatigue Markers in Full Scale Fatigue Test of an Aircraft Structure
Autorzy:: Leski, A.
Kłysz, S.
Lisiecki, J.
Gmurczyk, G.
Reymer, P.
Bochenek, D.
Zasada, D.
Tematy:: full scale fatigue test
fatigue markers
load block rearrangement; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/97777.pdf Link otwiera się w nowym oknie
Opis:: Air Force Institute of Technology participates in the service life assessment programme SEWST. The aim of this programme, funded by the Polish Ministry of Defense, is to modify the operation system of PZL-130 "Orlik" TC-II turbo propelled trainer aircraft. The structural part of the programme is focused on the Full Scale Fatigue Test of the whole airframe to be conducted at the VZLU in the Czech Republic. The load spectrum for the test was developed by the AFIT based on the flight test results. The basic load block represents 200 simulated flight hours and consists of 194 flights showing different levels of severity. At the end of the Full Scale Fatigue Test a teardown inspection is planned during which it would be most beneficial to be able to determine crack propagation rate by means of a crack surface inspection. Markers are usually visible on most fatigue crack surfaces, however they occur randomly therefore it is almost impossible to conclude anything about the crack history. Since the preliminary load block consisted of separate flights (flight loads together with landing and taxing loads) showing significantly different levels of severity, the easiest way to modify the load block was to change the order of flights within the block. Hence a pilot programme was started at the AFIT which was focused on the determination of the influence of flight sequence on crack appearance. Several load blocks were determined using various techniques of rearranging the order of flights within the preliminary load spectrum. This approach ensured the preservation of the initial severity of the load block and simultaneously enabled a significant increase in the probability of the markers occurrence introducing neither artificial underloads nor overloads that would most probably affect the crack propagation rate. Fatigue crack surfaces were inspected using Scanning Electron Microscope. As a result of the investigations a series of images were obtained showing the specimen microstructure with visible markers arranged in the desired sequences. Based on the obtained pictures the most promising load block arrangements were chosen for the Full Scale Fatigue Test.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Mi-24 Helicopter Full Scale Fatigue Test Concept
Autorzy:: Reymer, Piotr
Zieliński, Wojciech
Piątkowski, Łukasz
Dziendzikowski, Michał
Kurnyta, Artur
Wrąbel, Rafał
Cichocki, Tomasz
Leśniczak, Andrzej
Kurdelski, Marcin
Dragan, Krzysztof
Tematy:: Full Scale Fatigue Test
Mi-24 helicopter; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/97821.pdf Link otwiera się w nowym oknie
Opis:: 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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effect of Laser Preheating AISI 4140 Specimens for Micro-Forging
Autorzy:: Jung, C.
Lee, M. G.
Jeon, Y.
Tematy:: laser preheating
micro-forging
fatigue strength
ultrasonic fatigue test
hardness; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/351766.pdf Link otwiera się w nowym oknie
Opis:: Many high performance and permanent service parts require suitable material characteristics-high fatigue strength is one of the most important characteristics. For this reason, surface treatment processes are essential to increase the material performance and avoid the use of costly ineffective material. There exist various surface treatment processes for various applications. Each process has advantages and disadvantages and hybridization can solve various problems. The micro-forging process delivers a controlled and uniform surface hardness, but the depth of the forged surface is limited. On the other hand, laser heat treatment can increase the hardness drastically, but the surface may become brittle, which reduces the fatigue life. Laser-assisted micro-forging is a novel hybrid process of laser heat treatment and micro-forging that has the potential to increase the forging depth and relax the stress caused by the high temperature of the forging process. This study examines the effect of laser preheating in the micro-forging of AISI 4140. The processes were varied as follows: no treatment, micro-forging only, and laser-assisted micro-forging. The fatigue strength of the specimens was examined by means of an ultrasonic fatigue tester and then compared. The microstructural changes were investigated with respect to the processes by using scanning electron microscopy. In conclusion, it was confirmed that the laser preheating auxiliary forging affects the fatigue life. It was confirmed that the fatigue life was the mostly increased in 550°C temperature laser preheating micro forging process and the temperature was identified as the most important factor.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Flight Loads Acquisition for PZL-130 Orlik TCII Full Scale Fatigue Test
Autorzy:: Reymer, P.
Leski, A.
Tematy:: full scale fatigue test
flight loads
strain measurement; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/97994.pdf Link otwiera się w nowym oknie
Opis:: The following article presents the research conducted under a complex structure integrity program for PZL-130 "Orlik" TC-II trainer aircraft. The aim of the research was to obtain the actual flight loads characteristic for the Polish Air Force which further on will be used to determine characteristic load spectrum for the Full Scale Fatigue Test purpose. This paper presents the methodology as well as a brief discussion of the obtained results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Sensitivity Analysis of the Nasgro Equation Based on the PZL-130 TC-II Orlik Trainer Aircraft Full Scale Fatigue Test
Autorzy:: Reymer, Piotr
Leski, Andrzej
Kurdelski, Marcin
Tematy:: sensitivity analysis
crack propagation
full scale fatigue test; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/24201173.pdf Link otwiera się w nowym oknie
Opis:: 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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical simulation of fatigue delamination growth under mode I loading conditions
Autorzy:: Bajurko, P.
Czajkowska, K.
Czarnocki, P.
Szeląg, D.
Tematy:: polymeric composite
fatigue delamination
numerical simulation
fatigue test
Paris-Erdogen relationship; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247320.pdf Link otwiera się w nowym oknie
Opis:: Delaminations are common defects that deteriorate strength of laminates. Delaminations can arise in the course of manufacturing due to faulty fabrication process or can result from low energy impacts, (e.g. FOD), that can take place in service. Once a delamination has been detected, a question will arise whether the defective component can still stay in service or should be immediately repaired or replaced. Before the decision is made, one of the factors that must be considered is a possible delamination growth rate under the expected service cyclic loading. One of the most effective tools that help to answer this question is a numerical simulation of delamination growth. Relatively easy way to simulate fatigue delamination growth under Mode I loading conditions is presented. The a=f(n) relationship was simulated. The simulation was performed with the help of FEM. The delamination extension resulted from gradual reduction in the stiffness of cohesive elements of length t that were located along the expected delamination path. It was assumed that the delamination would extend by delta a=t if the cohesive element stiffness dropped to 0. The applied degradation procedure of the initial mechanical properties of the cohesive elements was based on Paris low. For each delamination, extension increment the degradation process was limited to the cohesive element adjacent to the delamination front. In case of laminates, so far, there is no standard procedure available to determine Paris low and the one used to determine it for the purpose of the simulation performed is presented, as well. The simulation was ended when the number of cycles simulated exceeded 1000 000. The numerical results were verified against the experimental ones resulting from the four specimens tested and a satisfactory agreement was found. The difference between the a=f(n) relationship obtained by the simulation and the one being the average of the four tests was smaller than the scatter of the tests results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Testing internal mechanical stresses in flash-butt welded rail joints
Autorzy:: Mikłaszewicz, Ireneusz
Siwiec, Jakub
Tematy:: mechanical stress
rail joints
strain gauges
fatigue test; Pokaż więcej
Wydawca:: Instytut Kolejnictwa
Powiązania:: https://bibliotekanauki.pl/articles/215467.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the results of internal stress tests in rails and flash-butt welded rail joints. Stress patterns were tested in rail joints just after flash-butt welding, as well as after fatigue tests. Stress tests were performed using the destructive strain gauges based test method. Stresses emerging in rails and in rail joints were compared for the steel grades R260 and R350HT. Stress measurements were performed in accordance with the requirements of PN EN 13674 1:2011+A1:2017.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A New Approach to Modelling and Testing the Fatigue Strength of Helicopter Rotor Blades during Repair Process
Autorzy:: Sałaciński, Michał
Kowalski, Rafał
Szmidt, Michał
Augustyn, Sławomir
Tematy:: rotor blade
helicopter
fatigue test
repairs
bonding
composites; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/98006.pdf Link otwiera się w nowym oknie
Opis:: The fatigue test was carried out on an element of a rotor blade removed from the Mi-2 helicopter. The purpose of the test was to check the fatigue strength of the repaired rotor blade. Metal composite rotor blades have a metal spar in the form of a box and the trailing sections in the form of metallic honeycomb sandwich panels. The trailing sections are bonded to the spar. The repair had been carried out at the point where the trailing section became debonded from the spar at the Air Force Institute of Technology in Warsaw using a methodology developed for carrying out repairs of rotor blades’ damage. All types of the Mi family helicopters are equipped with metal composite rotors blades. Depending on MTOW (Maximum Take-Off Weight) and destination of helicopters, blades differ in dimensions, but their design solutions are practically the same. For this reason, the developed repair methodology can be used for all characteristic rotor blades structures for Mi helicopters. The fatigue test was performed at the Łukasiewicz - Institute of Aviation in Warsaw, using a hydraulically driven fatigue machine. The fatigue test was carried out by performing over 1.1 million load cycles. In repair places, upon completion of fatigue testing, no damage was found.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The simulation and the experimental verification of the influence of the tig - welding of the aluminium alloy AlMgSi07 on changes of the mechanical properties in comparison with the basic material
Autorzy:: Blatnický, Miroslav
Kopas, Peter
Sága, Milan
Tematy:: sinusoidal cyclic loading
fatigue test
stress
structural material; Pokaż więcej
Wydawca:: Uniwersytet Kazimierza Wielkiego w Bydgoszczy
Powiązania:: https://bibliotekanauki.pl/articles/41204171.pdf Link otwiera się w nowym oknie
Opis:: The aim of this investigation is to evaluate the influence on fatigue behavior of the welded aluminum alloy AlMgSi07. For the experimental measurement of fatigue of these welds, it is needed to analyse all the changes, which will occur in the weld material in comparison with the basic material. The modern computer simulation and the experimental verification are strong tools for achievement of the required results, for instance a change of the structure, residual stress, a range of the heat affected zone, a deformation of the workpiece etc.
Dostawca treści:: Biblioteka Nauki

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