Update: Service Life Tests for Roofing Membranes

2008 ◽  
pp. 136-136-8 ◽  
Author(s):  
DM Bailey ◽  
CG Cash ◽  
AG Davies
Keyword(s):  
Service Life ◽  
Life Tests

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).

DEVELOPMENT OF A BLOCK DIAGRAM AND SIMULATION MODEL OF A CHARGING AND DISCHARGING DEVICE FOR HIGH-CAPACITY LITHIUM-ION BATTERIES

2021 ◽  
pp. 89-94
Author(s):  
Н.В. Сушкевич
Keyword(s):  
Service Life ◽  
Simulation Model ◽  
Lithium Ion Batteries ◽  
Pulse Current ◽  
Block Diagram ◽  
High Capacity ◽  
Lithium Ion ◽  
Voltage Converter ◽  
Current Converter ◽  
Life Tests

Зарядно-разрядное устройство (ЗРУ) используется в качестве оборудования для проведения ресурсных испытаний аккумуляторных батарей. В данной статье разработаны структурная схема и имитационная модель ЗРУ, содержащего импульсный преобразователь тока и импульсный преобразователь напряжения. The charging and discharging device (CDD) is used as the equipment for carrying out service life tests of accumulator batteries. In this article, a block diagram and a simulation model of a CDD containing a pulse current converter and a pulse voltage converter are developed.

ANALYSIS OF THE STATIC ERROR OF A CHARGING AND DISCHARGING DEVICE FOR HIGH-CAPACITY LITHIUM-ION BATTERIES

2021 ◽  
pp. 84-88
Author(s):  
Н.В. Сушкевич ◽  
Л.А. Казаковцев
Keyword(s):  
Service Life ◽  
Lithium Ion Batteries ◽  
High Capacity ◽  
Lithium Ion ◽  
Static Error ◽  
Life Tests

В качестве оборудования ресурсных испытаний аккумуляторных батарей используется зарядно-разрядное устройство (ЗРУ). В данной статье проведен анализ статической погрешности ЗРУ, определена методическая ошибка, а также предложена методика определения коэффициентов разомкнутых контуров. The charging and discharging device (CDD) is used as the equipment for carrying out service life tests of accumulator batteries. In this article, we perform the analysis of the static error of the CDD, determine the methodological, and propose a method for determining the coefficients of open contours.

scholarly journals Resource assessment in the collision of modern designed tank cars manufactured by JSC “Ruzkhimmash”

2021 ◽  
Vol 2021 (2) ◽  
pp. 159-168
Author(s):  
V. V. Galov ◽  
◽  
V. A. Bashmakov ◽  
A. V. Grigoriev ◽  
◽  
...  
Keyword(s):  
Service Life ◽  
Fatigue Damage ◽  
Practical Importance ◽  
Resource Assessment ◽  
Rolling Stock ◽  
Future Design ◽  
Operational Characteristics ◽  
Design Documentation ◽  
Life Tests ◽  
Loading Modes

Objective: To study the nature of fatigue damage in modern tank cars using the results of multiple collision life tests. To show the need for life tests by making appropriate changes to design documentation and increasing the competitiveness of products due to the increase in service life. To confirm the possibility of a longer service life of the wagons. To identify potentially hazardous areas in car’s structure, most susceptible to damage during operation. Methods: An experimental method was applied to assess the indicators of the cyclic durability on elements of the car’s structure by testing the resource in multiple collisions. Mathematical statistics were used to assess the test results and identify fatigue damage. Results: A comparative analysis was conducted on the design features of tested cars. The procedure for testing in impacts is also described. A statistical assessment of loading modes and accumulated fatigue damage is presented. Failures were experienced that impeded further testing. The results of the tests confirmed an increase in the service life of the cars of up to 32 years. On the basis of the detected damage, the car structure zones most susceptible to damage in operation were statistically determined. Practical importance: The need to increase the service life of cars up to 32 years was confirmed. The results of the tests carried out made it possible to make appropriate changes in the design documentation and to increase the competitiveness of cars produced by JSC Ruzkhimmash in the modern market. The accumulated experimental data can be used in the future design of tank cars giving improved operational characteristics compared to the existing rolling stock, including structural units subject to fatigue damage during operation.

V-Belt Life Prediction and Power Rating

1976 ◽  
Vol 98 (1) ◽  
pp. 340-347 ◽  
Author(s):  
L. R. Oliver ◽  
C. O. Johnson ◽  
W. F. Breig
Keyword(s):  
Finite Element ◽  
Fourier Series ◽  
Stress Distribution ◽  
Service Life ◽  
Life Prediction ◽  
Bending Stress ◽  
Stress Range ◽  
Stress Measurements ◽  
Life Tests ◽  
Belt Transmission

A new service-life prediction and rating formula is presented for use in designing V-belt transmission drives. Capability of current V-belt fatigue formulas is extended to account for effect of cord stress range. The formula is derived from (a) statistically designed and analyzed life tests, (b) cord bending stress measurements, and (c) Fourier series and finite element solutions for cord stress distribution.

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