Special features in ensuring strength and service life of aircraft structures made of polymer composite materials, with damage taken into account

1991 ◽  
Vol 26 (4) ◽  
pp. 513-522 ◽  
Author(s):  
A. F. Selikhov ◽  
A. E. Ushakov
Keyword(s):  
Composite Materials ◽  
Service Life ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Aircraft Structures

scholarly journals ПЕРСПЕКТИВИ РОСТУ ВИКОРИСТАННЯ ТЕРМОПЛАСТИЧНИХ КОМПОЗИЦІЙНИХ МАТЕРІАЛІВ У СВІТОВОМУ АВІАБУДУВАННІ

2020 ◽  
pp. 61-75
Author(s):  
Сергей Андреевич Бычков ◽  
Александр Витальевич Гайдачук ◽  
Алексей Викторович Андреев ◽  
Wang Bo
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Aviation Industry ◽  
Special Role ◽  
Aircraft Structures ◽  
Aircraft Manufacturing ◽  
Production Processes ◽  
High Level ◽  
The Cost

It is shown that in the complex problem of permanent increase in the competitiveness of aircraft, a special role is played by the increasing use of polymer composite materials in aircraft structures of the transport category every year. An important role is played not only by the rational choice of structural and technological solutions of their units and assemblies, but also by the use of new composite materials to reduce the cost and production time of aircraft structures, which greatly contributes to the implementation of high flight technological and economic characteristics of competitive aircraft in the global market for sales and services. A review and analysis of the development of new composite materials and technologies for their processing into products, discussed at the annual international exhibition Sampe 2019. From an analysis of the results of the materials of the exhibition and conferences held within its framework, it follows that the global aviation industry is paying more and more attention to the study of structural thermoplastics and the development of new technological processes associated with these materials, in particular, welding. In the field of aircraft manufacturing, various companies and institutes are working to optimize and reduce the cost of production processes for parts from polymer composite materials, especially in the direction of autoclave-free production technologies. New developments of leading aircraft manufacturers, in particular AIRBUS, for the creation of large-sized responsible high-load structural elements of aircraft from polymer composite materials with a thermoplastic matrix are presented. Of particular note is 3D printing technology, which aircraft manufacturers have successfully begun to use for the manufacture of aircraft parts. It is noted that this technology allows not only to reduce the production cycle of manufacturing parts, but also significantly reduce the energy intensity of processes, which positively affects the cost of products. During a visit to the AIRBUS factory in Nantes, a high level of automation of production processes for manufacturing parts from polymer composite materials with a large number of laying, winding machines, CNC machines, robots was noted, which is due to a significant production program for the A350XWB and A400M aircraft with a high degree of automation of production processes, and also a very high level of safety and labor protection.

APPLICATION OF DEEP NEURAL NETWORKS BASED ON PALLIATIVE ANALYSIS UNDER CONDITIONS OF INCOMPLETE INFORMATION OF OPTICAL THERMAL AND ELECTRIC NONDESTRUCTIVE TESTING FOR PREDICTION OF THE LIMIT RESOURCE OF OPERATION OF CONSTRUCTION

2021 ◽  
pp. 4-15
Author(s):  
S. O. Kozel'skaya ◽  
D. A. Akimov ◽  
A. S. Andreev ◽  
O. N. Budadin ◽  
V. V. Kotel'nikov
Keyword(s):  
Composite Materials ◽  
Service Life ◽  
Polymer Composite ◽  
Prediction Models ◽  
Test Methods ◽  
Operational Stability ◽  
Polymer Composite Materials ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive

The problem of assessing operational stability and, accordingly, assessing the storage and safe operation periods of objects (for example, load-bearing structural structures made of polymer composite materials (PCM)) has always been one of the most important. At present, this prediction problem is mainly solved on the basis of product testing, as well as a detailed study of the regularities of the physicochemical aging processes occurring in PCM and changes in the physical and mechanical characteristics of products, and the creation on this basis of appropriate test methods and mathematical prediction models. The paper considers the problem of increasing the reliability of assessing the maximum service life of multicomponent structures by constructing predictive models using the results of optical-thermal and electrical non-destructive testing of the state of objects by temperature fields and the value of internal deformation of the material under force on the structure as input information. It is shown that in the case of using logical approaches as a software tool for predicting the ultimate resource of structures made of polymer composite materials, part of the knowledge should be used for reasoning that provides an explanation of the conclusions drawn, since formal logic is of limited applicability, especially in conditions of incomplete or uncertain information. In this case, the solution to the problem becomes the identification and establishment of cause-and-effect relationships. For the tasks of technical assessment of the quality of structures and their service life, the use of such logical conclusions as inductive, deductive and analogous conclusions is impossible, since for their work, they require all information about the diagnosed structure. The use of the proposed method for assessing the service life will allow timely stopping the loading of products with loads and, thus, preventing structural destruction. It should be borne in mind that in order to reliably predict the ultimate service life of complex structures made of composite materials using the proposed method, a set of various input instrumental and subjective information about the structural and operational characteristics of the product is required, including information on intermediate tests, non-destructive testing data. at various stages of manufacturing, design features, stability of parameters during the development process, subjective opinions of specialists, changes in the properties of materials from time to time and loads, etc. Implementation of the proposed approach will allow creating a new generation of test methods and predicting operational stability with an assessment of the limiting service life of elements and structures, which, ultimately, will provide an additional opportunity for developing practical recommendations for confirming or extending the warranty periods of operation and increasing the reliability and safety of operation of structures.

FSUE "VIAM" solvent-free binders for polymer composite materials

2016 ◽  
Vol 2 (2) ◽  
pp. 37-42 ◽  
Author(s):  
E. N. Kablov ◽  
L. V. Chursova ◽  
A. N. Babin ◽  
R. R. Mukhametov ◽  
N. N. Panina
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Solvent Free ◽  
Polymer Composite Materials
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