Methods of mechanical treatment of machine parts made of fibrous polymer composite materials (Review)

2021 ◽  
Vol 0 (6) ◽  
pp. 35-38
Author(s):  
I. S. Bolotnikov ◽  
◽  
E. A. Kosenko ◽  
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Mechanical Treatment ◽  
Integrated Approach ◽  
Small Mass ◽  
Individual Characteristics ◽  
Polymer Composite Materials ◽  
Fibrous Polymer ◽  
Fibrous Polymer Composite ◽  
Machine Parts

The growing volumes of production of mechanical engineering products made of fibrous polymer composite materials can be explained with the possibility of producing products of relatively small mass with specified physical and mechanical, thermophysical, dielectric and many other properties, which allows them to be highly competitive in comparison with products made of metals and their alloys. The results of a review of the main defects that arise during the machining of machine parts made of fibrous polymer composite materials, as well as ways to prevent their occurrence and improve the quality of the treated surfaces are presented and discussed. Based on the analysis of the information presented, it was concluded that increasing the efficiency of mechanical treatment of machine parts made of fibrous polymer composite materials and ensuring the durability of such parts was possible due to an integrated approach to the development of a technological process of mechanical treatment, taking into account individual characteristics of various types of fibrous polymer composite materials.

The Tool’s Optimum Geometry Research for Obtaining Apertures in Semi-Cured Polymer Composite Materials

2021 ◽  
Vol 882 ◽  
pp. 114-120
Author(s):  
Mikhail Andreevich Komkov ◽  
Tatyana Vladimirovna Vasilyeva ◽  
Yuriy Nikolaevich Khokhlov ◽  
Mary Alekseevna Prokhorova
Keyword(s):  
Numerical Modeling ◽  
Composite Materials ◽  
Polymer Composite ◽  
Optimal Shape ◽  
Polymer Composite Materials ◽  
New Method ◽  
Optimum Geometry ◽  
Fibrous Polymer ◽  
Fibrous Polymer Composite

The composite materials features and characteristic defects in the obtaining apertures by machining are considered. A new method for forming apertures in fibrous polymer composite materials is proposed. The optimal shape of a tool for piercing holes is determined. The profiles of the pointed part of the tool are compared using numerical modeling.

On the sensitivity of large precision space structures of high-modulus fibrous polymer composite materials to microdynamical effects

2020 ◽  
Author(s):  
S.N. Sayapin
Keyword(s):  
Elastic Modulus ◽  
Composite Materials ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Space Structures ◽  
High Modulus ◽  
Abrupt Increase ◽  
Orbital Flight ◽  
Fibrous Polymer ◽  
Fibrous Polymer Composite

The paper considers the problem of sensitivity of large precision space structures made of high-modulus fibrous polymer composite materials to external and internal microdynamic effects. This problem is related to the extent of structure forming elements, as well as to an abrupt increase in the elastic modulus of the material when passing the threshold of low stresses. It is found that under low loading in the orbital flight conditions the calculated values of the elastic modulus of large precision space structures made of high-modulus fibrous polymer composite materials may be higher than the real ones by more than 20 times, which must be taken into account in the calculations. Possible ways to reduce the sensitivity of such space structures made of high-modulus fibrous polymer composite materials to external and internal microdynamic effects are shown.

scholarly journals Numerical Modeling of Tribological Characteristics of Fibrous Polymer Composite Materials

2021 ◽  
pp. 198-206
Author(s):  
Denis D. Palkin ◽  
Andrey A. Chekalkin
Keyword(s):  
Numerical Simulation ◽  
Composite Materials ◽  
Polymer Composite ◽  
Local Approximation ◽  
Polymer Composite Materials ◽  
Normal Stresses ◽  
The Coefficient Of Friction ◽  
Fibrous Polymer ◽  
Fibrous Polymer Composite ◽  
Mechanics Of Composite Materials

The paper presents a numerical simulation of the contact interaction of fibrous polymer composite materials in a finite element ANSYS package and studies the friction coefficients for cells with wear of 0%, 25%, 50% and 75%. To predict the coefficient of friction of composites it was proposed to use the method of mechanics of composite materials – the method of local approximation. With the help of numerical simulation, the fields of distribution of normal stresses and contact stresses in the contact zone were obtained and the corresponding conclusions were drawn

scholarly journals A concept of optimization of structural and technological parameters of polymer composite rocket units considering the character of their production

2020 ◽  
Vol 26 (6) ◽  
pp. 5-22
Author(s):  
A.V. Kondratiev ◽  
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Composite Structures ◽  
Linear Thermal Expansion ◽  
Integrated Approach ◽  
Polymer Composite Materials ◽  
Launch Vehicles ◽  
Space Technology ◽  
Technological Parameters ◽  
Load Bearing

We present a concept of optimization of structural and technological parameters of rocket and space technology units from polymer composite materials under heterogeneous loading and a project complex for their rational selection, taking into account the current level of production. The concept includes five interconnected components: design, production technologies, operation, ecology, and safety of industrial life. The analysis of possible criteria-based optimization estimates is carried out on the example of the technological component of the problem. Decompositions of the general task of parameters’ optimization were carried out into a number of types that correspond to the main types of structures of the considered class of technology: load-bearing compartments of launch vehicles and precision structures of spacecraft. An integrated approach to the optimal design of the bearing compartments of the head block of launch vehicles of various structural and power schemes is proposed. A distinctive feature of the approach is the possibility of multifactor optimization of the parameters for units of the class under consideration while providing regulated load-bearing capacity with simultaneous power and heat loading, taking into account technological, operational, economic, and environmental restrictions that correspond to the existing level of their production. A conceptual approach to the synthesis of rational parameters of composite frames of solar panels of various structural and power circuits is proposed, based on the integrated realization of well-known principles implemented by relevant units that are integrated by computer technology into a single optimization complex. An integrated approach has been synthesized to create precision space structures from polymer composite materials, which makes it possible to obtain rational thermo-dimensionally stable composite structures. An algorithm for determining the rational structure of a composite package has been developed and implemented, which provides a compromise combination for the absolute values of the coefficient of linear thermal expansion keeping maximum precision of the product in accordance with the proposed criteria. The results obtained made it possible to provide an increase by more than 20% in the mass efficiency of the composite aggregates of rocket and space technology produced at the leading enterprises of the industry.

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