scholarly journals NUMERICAL AND EXERIMENTAL MODELING OF RIGID JOINT OF LAYERED WOODEN STRUCTURES

2017 ◽  
Vol 13 (2) ◽  
pp. 84-92
Author(s):  
Mikhail A. Vodiannikov ◽  
Galina G. Kashevarova
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Contact Problems ◽  
Continuous Beam ◽  
Structural Failure ◽  
Ansys Software ◽  
Software Complex ◽  
Wooden Structures

The article deals with the problems of modeling and solving contact problems in the ANSYS software complex using the example of calculating the rigid joint of a glued wooden beam. Comparative calculation data for a continuous beam and a beam with a joint in the middle on pasted carbon fiber nails are given. The possibilities of using contact elements between different materials taking into account the nonlinearity of the formulation of the problem are described. The figures of stresses and displacements in the elements are shown. Experiments for determination of the bearing capacity of the joint and determine the nature of structural failure are provided. Conclusions are made about the possibility of modeling composite materials in the environment of the software complex ANSYS in the real structures design

scholarly journals DETERMINATION OF DEFORMATION IN MESH COMPOSITE STRUCTURE UNDER THE ACTION OF COMPRESSIVE LOADS

2020 ◽  
Vol 17 (35) ◽  
pp. 599-608 ◽  
Author(s):  
Alexander A. OREKHOV ◽  
Yuri A. UTKIN ◽  
Polina F. PRONINA
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Polymer Composite ◽  
Experimental Studies ◽  
Polymer Composite Material ◽  
Lightweight Mesh ◽  
Carbon Filler ◽  
Selection Of

One of the significant innovative technologies is the creation of large-sized structures that work for a long time in space and meet stringent restrictions on overall mass characteristics. Among these structures, in the first place, is the section of bearing truss (BT). This article presents the results of experimental studies of sectors of load-bearing trusses of mesh design for compression. Recently, composite mesh cylindrical shells are used as spacecraft housings. The mesh shell is a supporting structure to which the instruments and mechanisms of the spacecraft are attached. The truss section is made of cross-linked polymer composite material with carbon fibers. The objective of the tests is to confirm the possibility of creating a lightweight mesh construction using a carbon fiber reinforced polymer composite material. To achieve this goal, the authors were assigned the following tasks: selection of carbon filler of polymer composite materials (PCM); selection of PCM binder; determination of the degree of carbon fiber reinforcement; choice of the number and orientation paths of spiral ribs, number of ring ribs and the sizes of individual ribs. As a result of the research, the calculated indicators for ensuring the bearing capacity and stiffness under the application of axial compressive load were obtained. At the same time, with the determination of bearing capacity, the deformation characteristics of the structure were twice determined in order to confirm their repeatability, as well as linear nature of the dependence of axial and radial deformations as a result of the applied load.

scholarly journals Reinforcement of concrete by composite materials

2018 ◽  
Vol 149 ◽  
pp. 01046
Author(s):  
Bensaid Boulekbache ◽  
Mostefa Hamrat ◽  
Nejma Imane Gacem ◽  
Kheltoum Halimi
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Mechanical Behavior ◽  
Bearing Capacity ◽  
Experimental Work ◽  
Failure Modes ◽  
Confined Concrete ◽  
Clear Indication ◽  
Bending Loading ◽  
Behavior Strength

This work was devoted to the material-scale study of the mechanical behavior of confined concrete by composite materials based on carbon fiber and glass under compression and bending loading. In this context, an experimental work on cylindrical and prismatic concrete specimens has been carried out. The obtained results permitted the identification of the mechanical behavior, strength, deformability and failure modes. The outcome of the present research indicates an increase in the bearing capacity and deformability in compression and in tension. The reinforcement by means of composite materials appears as a pertinent solution and therefore, makes it possible to obtain clear indication on the type of confinement to be considered according to the intended purpose.

scholarly journals Determination of the load-bearing capacity of «steel-wood» connections of LVL structures under tension

2021 ◽  
Vol 18 (1) ◽  
pp. 60-69
Author(s):  
Quoc Phong Tran ◽  
Keyword(s):  
Bearing Capacity ◽  
Cross Section ◽  
Steel Plate ◽  
Experimental Studies ◽  
Steel Plates ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Dowel Connections ◽  
Wooden Structures

The article presents the results of calculation of the load-bearing capacity of connections of LVL structures under tension using cylindrical dowels in trusses and frames. The description of calculation schemes for determining the load-bearing capacity of connections with different location and sizes of steel plates in the connection is given. The influence of steel plate placement on the distribution of forces in the cross-section of samples is investigated. Based on the results of analytical and experimental studies, the load-bearing capacity of dowels during bending is considered, as well as the mechanism of wooden structures` fracture during chipping. A comparative analysis of the effectiveness of different schemes of dowel connections with three steel plates under tension is carried out.

Experimental Research of Crack Resistance of Composite Materials

2017 ◽  
Vol 736 ◽  
pp. 8-11 ◽  
Author(s):  
Sergey I. Koryagin ◽  
Nikolay L. Velikanov ◽  
Oleg V. Sharkov
Keyword(s):  
Composite Materials ◽  
Crack Resistance ◽  
Bearing Capacity ◽  
Compound Layer ◽  
Testing Procedure ◽  
Adhesive Composition ◽  
Adhesive Compositions ◽  
Adhesive Compound ◽  
Bending Load

An adhesive composition is used as a binder in many composite materials. Crack resistance of an adhesive composition is the most important characteristic determining the bearing capacity of composite materials. To date, a significant number of methodological recommendations and standards have been developed for estimation of adhesive compositions bearing capacity in different types of loading forces exertions which, with certain assumptions, can be used to assess their crack resistance. Known testing procedure for crack resistance of adhesive composition was selected as a basic one. It includes a bending load in the form of loadings acting perpendicular to cantilever beams which is applied to the double-cantilever sample. Therewith a sample response and a corresponding change in length of the resulting crack in the adhesive compound layer are being recorded. This is followed by a determination of the specific energy of crack propagation which provides information about the value of crack resistance.

scholarly journals Strengthening of the wooden structures

2020 ◽  
Vol 18 (3) ◽  
pp. 017-028
Author(s):  
Szymon Ślósarz
Keyword(s):  
Composite Materials ◽  
Bearing Capacity ◽  
Operating Conditions ◽  
Review Of The Literature ◽  
Wood Degradation ◽  
Load Bearing Capacity ◽  
Traditional Methods ◽  
Load Bearing ◽  
Modern Methods ◽  
Wooden Structures

The paper is a review of the literature on the strengthening of wooden structures. The strengthening methods are classified according to their purpose and specifics. The article deals with both traditional methods commonly used and modern methods involving the use of composite materials. The paper also includes description of studies on various strengthening methods as well as the presentation of their results. The author also refers to the causes of the loss of load bearing capacity, causes of wood degradation and wooden structures durability in relation to operating conditions.

Global trends in carbon fiber research

2019 ◽  
pp. 147-163
Author(s):  
N. Amangeldiuly ◽  
M. V. Fedorov
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Carbon Composites ◽  
Relevant Research ◽  
Carbon Fiber Composite ◽  
Global Trends ◽  
Near Future ◽  
Fiber Composite Materials

The review provides an analysis of global trends in current research in the field of carbon fiber composite materials. The paper considers studies conducted in 2018 and identifies four priority areas by assessing the amount of their funding. The mentioned areas include the utilization of carbon composites, optimization of their production process, the use of carbon composites in the aviation and shipbuilding industries. The review may contribute to the determination of high-priority and relevant research that will be conducted in the near future.

scholarly journals Features of strengthening metal structures with composite materials under the influence of an aggressive environment

Vestnik MGSU ◽  
2020 ◽  
pp. 496-509
Author(s):  
Anna N. Leonova ◽  
Oleg D. Sofyanikov ◽  
Irina A. Skripkina
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Galvanic Corrosion ◽  
Practical Experience ◽  
Building Structures ◽  
Metal Structures ◽  
Aggressive Environment ◽  
External Reinforcement ◽  
Fiber Materials

Introduction. This article is devoted to the issues of reinforcing metal building structures with external reinforcement systems with composite materials. The application of these strengthening methods in domestic literature and in practice has not been fully studied. As a result, it is relevant to study the characteristics of strengthening under the action of an external aggressive environment, namely when exposed to galvanic corrosion, elevated ambient temperatures and extreme temperatures from firing. The purpose of the study is to establish the effectiveness of reinforcing metal structures with composite materials under the influence of various force factors, including cyclic loads, and under the action of an external aggressive environment. Materials and methods. The methodological basis of scientific research was the analysis of publications of domestic and foreign scientists on the theoretical and practical experience of using composite materials to strengthen metal structures. During the study, when describing the dependences of physical quantities on external and internal force and non-force factors, scientific methods of induction, deduction, generalization and comparison were used. Results. Performed a comprehensive study of the effectiveness of the use of composite materials to enhance the metal structures in hostile environments. The dependence of the increase in strength of reinforced steel samples on the length of the adhesive joint of external reinforcement is analyzed, the possibility of applying reinforcement at fatigue stresses is investigated. Recommendations on the use of protective insulating systems and materials that prevent the reduction of the bearing capacity of structures from external non-force factors are given. Conclusions. The effectiveness of reinforcing metal structures using composite carbon fiber materials is revealed. The bearing capacity of reinforced structures may be increased by 59 %. When the glass transition temperature of carbon fiber materials is reached, the increase in the bearing capacity from external amplification systems decreases by 50 %, and when the temperature is increased to 60 °C, the external amplification systems are ineffective and do not increase the bearing capacity. To achieve the required fire resistance of the amplification systems, equal to at least one hour, it is necessary to use external fire insulation.

Sign in / Sign up

Export Citation Format

Share Document