Composite-friendly approach to certification of advanced materials and fabrication methods used in aviation industry

Дубинский, С. В.; Safonov, Alexander

doi:10.3103/s1052618817050041

Cited by 15 publications

(3 citation statements)

References 9 publications

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“…Currently, it is difficult to imagine any aerospace vehicle built without any parts manufactured by the pultrusion process. [141][142][143][144][145][146][147] Every year, composites become more and more involved in the aerospace industry, 140 thereby increasing the efficiency, performance, and competitiveness of aerospace vehicles. The aerospace industry is now applying such pultruded elements as shapes and profiles.…”

Section: Transportationmentioning

confidence: 99%

Pultruded materials and structures: A review

Vedernikov

Safonov

Tucci

et al. 2020

Journal of Composite Materials

149

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Currently, the application of pultruded profiles is increasing owing to their advantages, such as light weight, high strength, improved durability, corrosion resistance, ease of transportation, speed of assembly, and nonmagnetic/nonconductive characteristics. This review analyzes the main application fields of elements produced by pultrusion manufacturing processes: bridges and bridge decks, cooling towers, building elements and complete building systems, marine construction, transportation, and energy systems. Analysis of the scientific literature in relation to the mechanical behavior of pultruded elements is presented as well. Finally, this review outlines the future study possibilities, giving the researchers and practitioners the directions for deeper investigation of specific features and exploration of new ones concerning the mentioned aspects of pultruded fiber-reinforced polymer composites.

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Section: Transportationmentioning

confidence: 99%

Pultruded materials and structures: A review

Vedernikov

Safonov

Tucci

et al. 2020

Journal of Composite Materials

149

View full text Add to dashboard Cite

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“…Design of MS-21 aircraft with full composite wing has led to urgent need of advanced certification approach [9]. As a part of this approach the in-house studies on impact threats scenarios typical for local operational conditions were initiated.…”

Section: Field Surveymentioning

confidence: 99%

A study of accidental impact scenarios for composite wing damage tolerance evaluation

et al. 2019

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The field data characterising aircraft accidental in-service damage was collected, sorted and processed. By means of probabilistic analysis, the wing damageability statistical parameters were determined. The scenarios of wing accidental impacts were described and the qualitative distribution of impact intensity over the wing surfaces was obtained. By means of original analytical method, the metal dent depth data were converted into impact energy data and energy probabilistic distributions were established. It was shown that the functional relationships generated on domestic data are generally consistent with similar foreign results obtained on other types of aircraft with serious differences in operating conditions. Along with realistic impact damage scenarios, the high energy impact events were considered. It was noted that in some cases severe damage events should not be addressed as extremely improbable and should be included into design and certification process.

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“…Pultrusion is the most efficient process for producing composite structural profiles of constant cross-sections [ 1 , 2 , 3 ]. Owing to their high strength-to-weight ratio [ 4 , 5 ], superior corrosion resistance [ 6 , 7 ], and improved durability [ 8 , 9 ], pultruded profiles have been successfully used as structural elements in the fields of bridge construction [ 10 , 11 , 12 ], civil [ 13 , 14 ], and architectural engineering [ 15 , 16 ]; marine construction [ 17 , 18 ]; aerospace and aviation engineering [ 19 , 20 , 21 ]; transportation [ 22 , 23 ]; and energy systems [ 24 ]. However, process-induced deformations, such as spring-in (common in curved elements) and warpage (common in flat elements), may result in a certain loss in the economic efficiency of mass production of composite profiles [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Modeling Spring-In of L-Shaped Structural Profiles Pultruded at Different Pulling Speeds

et al. 2021

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Cure-induced deformations are inevitable in pultruded composite profiles due to the peculiarities of the pultrusion process and usually require the use of costly shimming operations at the assembly stage for their compensation. Residual stresses formed at the production and assembly stages impair the mechanical performance of pultruded elements. A numerical technique that would allow the prediction and reduction of cure-induced deformations is essential for the optimization of the pultrusion process. This study is aimed at the development of a numerical model that is able to predict spring-in in pultruded L-shaped profiles. The model was developed in the ABAQUS software suite with user subroutines UMAT, FILM, USDFLD, HETVAL, and UEXPAN. The authors used the 2D approach to describe the thermochemical and mechanical behavior via the modified Cure Hardening Instantaneous Linear Elastic (CHILE) model. The developed model was validated in two experiments conducted with a 6-month interval using glass fiber/vinyl ester resin L-shaped profiles manufactured at pulling speeds of 200, 400, and 600 mm/min. Spring-in predictions obtained with the proposed numerical model fall within the experimental data range. The validated model has allowed authors to establish that the increase in spring-in values observed at higher pulling speeds can be attributed to a higher fraction of uncured material in the composite exiting the die block and the subsequent increase in chemical shrinkage that occurs under unconstrained conditions. This study is the first one to isolate and evaluate the contributions of thermal and chemical shrinkage into spring-in evolution in pultruded profiles. Based on this model, the authors demonstrate the possibility of achieving the same level of spring-in at increased pulling speeds from 200 to 900 mm/min, either by using a post-die cooling tool or by reducing the chemical shrinkage of the resin. The study provides insight into the factors significantly affecting the spring-in, and it analyzes the methods of spring-in reduction that can be used by scholars to minimize the spring-in in the pultrusion process.

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Composite-friendly approach to certification of advanced materials and fabrication methods used in aviation industry

Cited by 15 publications

References 9 publications

Pultruded materials and structures: A review

Pultruded materials and structures: A review

A study of accidental impact scenarios for composite wing damage tolerance evaluation

Modeling Spring-In of L-Shaped Structural Profiles Pultruded at Different Pulling Speeds

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