scholarly journals Some Comments on Fatigue Life Tests of Aircraft Cable Control Systems

2020 ◽  
Vol 2020 (12) ◽  
pp. 102-112
Author(s):  
Józef Brzęczek
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Control Systems ◽  
Damage Tolerance ◽  
Fatigue Tests ◽  
Aircraft Control ◽  
Load Spectrum ◽  
Life Tests ◽  
Increase Service Life ◽  
And Performance

Abstract Cable control systems are widely used in aircraft and gliders. This paper deals with the problem of collecting real loads acting cable control systems and cable tests preparation (load spectrum) and performance. The author proposes a method for defining real loads acting on control systems, preparing and carrying out fatigue tests of cables revealing symptoms of fretting. The fatigue tests results can be used to predict service life, to plan and prepare periodic and details inspections. This method could be used to increase service life of aircraft control cables and could help to replace the commonly used Time-Based Maintenance (TBM) strategy with the Damage Tolerance (DT).

Using a Dovetail Fixture to Study Fretting Fatigue and Fretting Palliatives

2003 ◽  
Vol 128 (2) ◽  
pp. 133-141 ◽  
Author(s):  
B. P. Conner ◽  
T. Nicholas
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
Fatigue Damage ◽  
Fretting Fatigue ◽  
Fatigue Tests ◽  
Turbine Engines ◽  
Aluminum Bronze ◽  
Gas Turbine Engines ◽  
Contact Loads ◽  
Low Plasticity Burnishing

Fretting fatigue damage can reduce the service life of engineering components in contact. The attachment between blades and disks in the fan and compressor stages of gas turbine engines is often a dovetail geometry. As a result, normal and tangential cyclic contact loads are present. Results of fretting fatigue tests using a new dovetail fixture are detailed here. Dovetail specimens and three types of contact pads were all machined out of Ti−6A1−4V. Two types of palliatives are also examined: aluminum bronze coatings and low-plasticity burnishing. While the palliatives were effective in increasing the fatigue life, the three pad geometries produced essentially the same fatigue life.

Research on the Very-High-Cycle Fatigue Life Analysis of High-Speed Take-Up Winder

2014 ◽  
Vol 488-489 ◽  
pp. 1281-1284
Author(s):  
Yong Li ◽  
Wen Qin Liu ◽  
Zhou Yang
Keyword(s):  
Fatigue Life ◽  
Service Life ◽  
High Speed ◽  
High Cycle Fatigue ◽  
Fatigue Tests ◽  
Chemical Fiber ◽  
Cycle Fatigue ◽  
Life Analysis ◽  
Fatigue Life Analysis ◽  
Vibration Performance

The take-up winder is an important equipment of chemical fiber textile machinery. Vibration performance is the key to decide quality and service life of product. The modal of winder is analyzed. It is shown that the rotation speed cannot be kept away from fifth and sixth resonance frequency. The Maximum stress response is calculated by harmonic analysis. According to results of high-cycle fatigue tests, the service life of winder is evaluated. The results show that there is the risk of fatigue damage for small damp ratio. Unlimited fatigue life can be obtained by creasing damp ratio. It can be concluded that creasing damp is an effective way to improve the service life.

scholarly journals Fatigue Life for Different Stress Concentration Factors for Stainless Steel 1.4301

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3677 ◽  
Author(s):  
Przemysław Strzelecki ◽  
Adam Mazurkiewicz ◽  
Janusz Musiał ◽  
Tomasz Tomaszewski ◽  
Małgorzata Słomion
Keyword(s):  
Fatigue Life ◽  
Shape Factor ◽  
Fatigue Tests ◽  
Shape Factors ◽  
Aisi 304 Steel ◽  
Static Tensile ◽  
Life Tests ◽  
Rotating Bending ◽  
Cracking Mode ◽  
Stress Concentration Factors

This paper presents the results of the static tensile and fatigue life tests under rotating bending of round 1.4301 (AISI 304) steel samples. The fatigue tests were carried out on smooth and notched samples with three different rounding angles with a shape factor of 1.4, 2 and 2.6. A fatigue life was determined for samples with different shape factors subject to identical loads. The results showed that the scatter of fatigue test results decreases with an increase in shape factor. To evaluate the cracking properties (cracking mode and mechanism), microstructure and fractographic tests of the fractured samples were carried out.

Creep-Fatigue Tests on Full Scale Directionally Solidified Turbine Blades

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Xiaojun Yan ◽  
Jingxu Nie
Keyword(s):  
Fatigue Life ◽  
Test Data ◽  
Low Cycle Fatigue ◽  
Turbine Blades ◽  
Fatigue Tests ◽  
Full Scale ◽  
Life Assessment ◽  
Directionally Solidified ◽  
Creep Fatigue ◽  
Life Tests

A new experimental method, in which a full scale directionally solidified (DS) alloy turbine blade is loaded by a special design rig employing friction force and heated by eddy current induction, is proposed to conduct creep-fatigue life tests in this investigation. The method can take factors such as geometry, volume, especially cast procedures, etc., into creep-fatigue life assessment. Principle and design of the test rig are fully explained. Creep-fatigue tests of turbine blades made of DZ4 alloy (one type of DS alloys) were conducted and test data were analyzed. Life prediction based on test data of this investigation shows good agreement with actual flight experience of these blades. The method of this article provides a new way to estimate the potential creep-fatigue or low cycle fatigue life for turbine blades.

scholarly journals Fatigue Tests and Metallographic of Explosively Cladded Steel-Titanium Bimetal/ Badania Zmęczeniowe I Metalograficzne Bimetalu Stal-Tytan Zgrzewanego Wybuchowo

2014 ◽  
Vol 59 (4) ◽  
pp. 1565-1570 ◽  
Author(s):  
A. Kurek ◽  
M. Wachowski ◽  
A. Niesłony ◽  
T. Płocinski ◽  
K.J. Kurzydłowski
Keyword(s):  
Fatigue Life ◽  
Fatigue Tests ◽  
Explosive Cladding ◽  
Life Tests ◽  
Cladded Steel

Abstract The paper contains a description of fatigue life tests of titan-steel bimetal. The study involved specimens made of bimetal which was a combination of S355J2 steel and SB G1 265 titanium, which was imposed in the material by explosive cladding method. The research shows that the fatigue life of specimens made of native material, derived from cladded plate is less than the life of specimens of titanium-steel bimetal

FORCE CONDITIONS OF TRANSITION TO ONE-ZONE PROCESS OF BACKWARD SLIP DURING COLD ROLLING OF STRIPS

2020 ◽  
pp. 45-53
Author(s):  
L.S. Kokhan ◽  
◽  
A.V. Aldunin ◽  
Keyword(s):  
Service Life ◽  
Cold Rolling ◽  
Considerable Decrease ◽  
Steel Strips ◽  
Increase Service Life

Results of analytical researches of power parameters of cold rolling of thin and average steel strips with a back tension are presented. Considerable decrease in average relative tension on a surface of contact with rolling rolls upon transition is established from two-zonal to one-zonal rolling of lag. It allows to increase service life of rolling rolls.

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