Fatigue and Damage Tolerance of Aging Airplane Structures

Nesterenko, B. G.; Nesterenko, G. I.

doi:10.4028/www.scientific.net/amr.891-892.1669

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…[67,68] Introduction of fracture mechanics to bonded materials has revolutionized the field leading to more reliable structures by introducing new design criteria and predictive tools. [69][70][71][72] Nowadays, one of the faster developing industries is the wind energy highly supported by the EU which is committed to reach the green transition goals. [73,74] Here, for wind turbine rotor blades, fracture mechanics is so crucial that 8 out of 9 recognized failure modes of wind turbine blades are rooted to fracture and its special, interface, forms: delamination (crack growth between composite material layers) and debonding (crack growth along interface between two bonded materials).…”

Section: Fracture Analysismentioning

confidence: 99%

Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview

Budzik

Wolfahrt

Reis

et al. 2021

The Journal of Adhesion

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The development of new adhesives has allowed to expand the application of bonding into the most diverse industrial fields. This review article presents the commonly used experimental methods for the investigation of mechanical performance of adhesively bonded joints in the aerospace, wind energy, automotive and civil engineering sectors. In these sectors, due to their excellent intrinsic properties, composite materials are often used along with conventional materials such as steel, concrete and aluminium. In this context, and due to the limitations that the traditional joining techniques present, adhesive joints are an excellent alternative. However, standardized experimental procedures are not always applicable for testing representative adhesive joints in these industries. Lack of relevant regulations across the different fields is often overcome by the academia and companies' own regulations and standards. Additional costs are thus mitigated to the industrial sectors in relation with the certification process which effectively can deprive even the biggest companies from promoting adhesive bonding. To ensure continuous growth of the adhesive bonding field the new international standards, focusing on actual adhesive joints' performance rather than on specific application of adhesive joints are necessary.

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Section: Fracture Analysismentioning

confidence: 99%

Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview

Budzik

Wolfahrt

Reis

et al. 2021

The Journal of Adhesion

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“…Therefore, a reliable diagnostics of the products damaging for assessing their residual lifetime, especially under cyclic loading, is a very important factor for the safe operation of industrial objects, technological equipment or structural elements. There are a number of methods for detecting damages or diagnosing the material state in oil and gas pipeline constructions [1,2], railway transport [3][4][5] or aviation [6,7]. It is clear that not all defects or micro-damages can cause the failure therefore it is necessary to know the minimum dimension of the damage that is of danger and that should be reliable detected.…”

Section: Introductionmentioning

confidence: 99%

The peculiarities of fatigue process zone formation of structural materials

Chepil¹,

Vira²,

Kharchenko³

et al. 2018

Diagnostyka

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It is shown that with a cyclic loading in the vicinity of the stress concentrator within the static and cyclic plastic zones, a specific volume of material is gradually formedthe fatigue process zone. Its size d * determines the length of non-propagated cracks or safety defects in the material and can be a determining factor in the diagnosis of material damage. For these materials, the size d * does not depend a lot on the type and geometric characteristics of the stress concentrator. It can be determined by laboratory conditions. While detecting the defects which are longer than d * , it is decided to reduce the intervals between inspections of the construction element, repair or replace it. Keywords: fatigue, durability, fatigue process zone, crack initiation and growth, defects of materials OSOBLIWOŚCI TWORZENIA STREFY PROCESU ZMĘCZENIOWEGO W MATERIAŁACH KONSTRUKCYJNYCH Streszczenie Pokazano, że cykliczne obciążenie w pobliżu koncentratora naprężeń w statycznych i cyklicznych strefach plastycznych stopniowo tworzy specyficzną objętość materiału-strefę procesu zmęczeniowego. Jej rozmiar d * określa długość nierosnoncych pęknięć lub innych bezpiecznych defektów i może być czynnikiem decydującym w diagnozie uszkodzeń materiału. Dla badanych materiałów rozmiar d * mało zależy od rodzaju i geometrycznych charakterystyk koncentratora naprężeń. Jego można wyznaczyć w warunkach laboratoryjnych. Po ujawnieniu defektów, dłóższych niż d * , podejmuje się decyzja o skróceniu czasu między przeglądami elementa konstrukcji, jego remoncie lum zamianie. Słowa kluczowe: zmęczenie; trwałość; strefa procesu zmęczeniowego; inicjacja i propagacja pęknięcia; defekty materiałowe

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“…Одновременно с этим, не смотря на растущие темпы производства авиационной техники, парки самолетов стареют. К категории стареющих относят самолеты, срок службы которых превышает 15 лет [1]. Парк самолетов транспортной категории, допущенных к эксплуатации на территории Украины, по состоянию на июль 2018г., приведен в табл.…”

Section: Introductionunclassified

“…Из всего парка эксплуатирующихся на Украине самолетов (212 экземпляров) более 75 % следует считать стареющими, а более 50 % (116 экземпляров) практически выработали свой проектный ресурс. Аналогичная ситуация отмечена и в других странах [1,2]. Вопрос продления ресурса или списания стареющих самолетов стоит очень остро.…”

Section: Introductionunclassified

Формирование Типовых Профилей Полетов Самолета Транспортной Категории С Учетом Истории Эксплуатации Парка

Бойко¹

2018

aktt

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The design resource of the airframe structure is assigned in the number of generalized typical flights or flight hours for all aircraft of the park. Both in the design and in the operational phases, the parameters of typical flight profiles serve as initial data for substantiating the design, accumulated or residual resources of the structural elements. An analysis of the load conditions of the transport category airplanes shows that even airplanes of the same type can have a completely different operating history. The projected typical flight profiles do not always correspond to the actual tasks performed by a particular aircraft. In addition, the operator does not have an explicit definition of the concept of a generalized type of flight. The question of the actual loads on the aircraft becomes particularly relevant at the stage of making a decision on the possible extension of the resource or the cancellation of the aircraft. The creation of modifications also requires the specification of the resource characteristics of the structure at the design stage. Definitely, such tasks are solved by the systems for monitoring the loads on the aircraft and onboard resource counters. The modern airplanes are equipped with this equipment. This study gives an estimation to the outmode park of transport category aircraft operating in Ukraine this year. It is proposed for the first time the method of determining the parameters of typical flight profiles according to the aircraft log-books and engines, as well considering the requirements of the flight manual of the considered type of transport aircraft. The algorithm for calculating the operation characteristics of the aircraft park was developed. The statistical analysis of the data of the Il-76T (TD) aircraft log-books was carried out in order to identify correlative dependencies on the duration of performed flights and relative operating time between some aircraft of the park. Recommendations are given for estimation the operating history of a specific aircraft and aircraft park. The obtained results in the future will serve as initial data for calculating the loads' influence on the aircraft during its operation, as well as for evaluating the accumulated and residual life of the transport category aircraft structure

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Fatigue and Damage Tolerance of Aging Airplane Structures

Cited by 3 publications

References 5 publications

Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview

Testing mechanical performance of adhesively bonded composite joints in engineering applications: an overview

The peculiarities of fatigue process zone formation of structural materials

Формирование Типовых Профилей Полетов Самолета Транспортной Категории С Учетом Истории Эксплуатации Парка

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