METHODS OF MODELING OF COMPOSITE MATERIALS  AND COMPOSITE STRUCTURES ON «LIRA-SAPR»

This paper provides detailed suggestions for the process of structural reinforcement modeling by composite materials on the software package «LIRA-SAPR». It also provides the implementation of bearing capacity checks for reinforced elements on the program called «ESPRI». The article offers an algorithm for calculation of the construction objects in case of design situation changing, considering the modeling of the composite structure reinforcement. It considered the modeling process of reinforcement of structures using classical methods, such as using of metal casing. It also investigated a numerical modeling example of the frame structure reinforcement, with the selection and verification of the composite material.

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THE MODELING OF STRUCTURAL ENFORCEMENT BY COMPOSITE MATERIALS ON “LIRA-SAPR”

International Journal for Computational Civil and Structural Engineering ◽

10.22337/2587-9618-2017-13-1-34-41 ◽

2017 ◽

Vol 13 (1) ◽

pp. 34-41

Author(s):

Maria S. Barabash ◽

Anatol V. Pikul ◽

Olga Bashynska

Keyword(s):

Composite Material ◽

Composite Materials ◽

Bearing Capacity ◽

Software Package ◽

Physical Nonlinearity ◽

Calculation Model ◽

Frame Structure ◽

Frame Design ◽

Structural Reinforcement ◽

Problem Formulations

This paper provides detailed suggestions for process of modeling the structural reinforcement by composite materials on the software package "LIRA-SAPR". It provides the implementation of bearing capacity checks for reinforced elements on the program called "ESPRI". The article offers an algorithm for calculation the construction objects in case of the changing of design situation, taking into account the modeling of the composite structure reinforcement. It considers the modeling process of reinforcement of structures using classical methods, such as using of metal casing. In the article you can also find a numerical modeling example of the frame structure reinforcement, with the selection and verification of the composite material. It considered the process of modeling the bearing capacity increasing with using the classical methods, namely the increase of the metal hooping. The article investigates the example of a numerical simulation of the frame bearing capacity increasing with the selection and verification of the composite material. Using the finite element method a mathematical model of the frame structure was constructed. In the frame work it was taken into account the occurrence of the bearing capacity increasing by composite materials in some elements. It compared the kinematic characteristics and effort that have arisen within the frame design model with static analysis, also taking into account physical nonlinearity in the calculation and enhancing certain elements reinforced with composite material. Also in this paper we describe a method of modeling the bearing capacity increasing with using the metal hooping.The calculation of reinforced element is made on the program called ESPRI, followed by an analysis of the overall calculation model work on the software package "LIRA-SAPR". The result of the article is a comparison and analysis of the stress-strain state of the considered computational model for various problem formulations. The results could be used for wider application in the study of methods for increasing the bearing capacity of buildings and structures.

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An Approach to Enhancement of Conductivity in Composite Material Using Nanotechnology

CANEUS2006: MNT for Aerospace Applications ◽

10.1115/caneus2006-11060 ◽

2006 ◽

Author(s):

Vivian T. Dang ◽

Russ Maguire ◽

Robab Safa-Bakhsh

Keyword(s):

Composite Material ◽

Composite Materials ◽

Composite Structure ◽

Composite Structures ◽

Test Methods ◽

Commercial Aircraft ◽

Nano Technology ◽

Novel Approaches ◽

Non Destructive ◽

Potential Integration

This review documents possible developments using Nano technology to enhance electromagnetic effects (EME) and identifies the potential integration on the composite structures for the next generation composite commercial aircraft. First, developments using Nano technology as a source to enhance the EME of the composite will be discussed. These developments include computational modeling of Nano-filled composites to predict certain properties and behaviors of Nano-enhanced materials, test methods for non-destructive examination of Nano-modified materials, and other novel approaches to resolve the challenges of increasing conductivity in composite materials. Next, the details of the potential impacts of using Nano technology for increasing conductivity will be outlined. Finally, the implementation of a Nano-enhanced material on the composite structure will be described.

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The development of an advanced composite structure using evolutionary design methods

10.51415/10321/497 ◽

2009 ◽

Author(s):

◽

David Van Wyk

Keyword(s):

Composite Materials ◽

Composite Structure ◽

Composite Structures ◽

Empirical Method ◽

Optimum Shape ◽

Evolutionary Design ◽

Structural Optimisation ◽

Design For Manufacture ◽

Advanced Composite ◽

Evolutionary Optimisation

The development of an evolutionary optimisation method and its application to the design of an advanced composite structure is discussed in this study. Composite materials are increasingly being used in various fields, and so optimisation of such structures would be advantageous. From among the various methods available, one particular method, known as Evolutionary Structural Optimisation (ESO), is shown here. ESO is an empirical method, based on the concept of removing and adding material from a structure, in order to create an optimum shape. The objective of the research is to create an ESO method, utilising MSC.Patran/Nastran, to optimise composite structures. The creation of the ESO algorithm is shown, and the results of the development of the ESO algorithm are presented. A tailfin of an aircraft was used as an application example. The aim was to reduce weight and create an optimised design for manufacture. The criterion for the analyses undertaken was stress based. Two models of the tailfin are used to demonstrate the effectiveness of the developed ESO algorithm. The results of this research are presented in the study.

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Bearing capacity of pultrusion fiberglass gusset sheets in frame structures

Vestnik MGSU ◽

10.22227/1997-0935.2020.8.1115-1125 ◽

2020 ◽

pp. 1115-1125

Author(s):

Daler N. Aripov ◽

Ivan L. Kuznetsov ◽

Marat A. Salakhutdinov

Keyword(s):

Composite Material ◽

Bearing Capacity ◽

Composite Structures ◽

Treatment Method ◽

Frame Structure ◽

Design Solution ◽

Frame Structures ◽

Original Design ◽

Gusset Plate ◽

Design Solutions

Introduction. At present, design and construction of all-composite structures with the use of pultrusion fiberglass profiles (PFP) are developing. The bearing capacity of all-composite structures is often limited by their node connections. Over the last two decades, many studies have been devoted to the operation of fiber-reinforced polymer (FRP) element nodes connected at right angles (or in the direction of pultrusion and across it). Frame construction nodes are formed by adjoining frame elements at different angles to the bands through gusset sheets. In accordance with the literature analysis, a small number of tests have been carried out to investigate connections at angles to the pultrusion direction. Existing design solutions of gusset sheets in FRP frame structures are mainly made of steel or composite material produced using other technologies (compaction method, pressure treatment method). This study focuses on the implementation of a node connection on unidirectional gusset sheets in which the fibers are positioned at the angle of 0°. Taking into account the specific features of the material, the gusset sheet design in frame structures has been adapted to the properties of pultrusion fiberglass. The purpose of this study is to increase the efficiency of PFP gusset sheet use in frame structures based on the specifications of this material. Materials and methods. The adaptive method was used when designing the node connection design on the frame structure gusset sheets. The material of the trapezoidal steel truss is changed to the composite material while retaining the original design solution. Subsequently, the structure is upgraded to take into account the properties and features of the composite material. Results. The main results of the study involve determining the factor of safety of pultrusion fiberglass at different angles to the direction of force. In order to increase the bearing capacity of the element node connection, various gusset plate design solutions are provided, which take into account different forces in the frame structure elements. Conclusions. When designing PFP constructions, features of the material must be taken into account. Replacing traditional materials with composite without adjusting the design layout and upgrading the structure leads to increased material intensity.

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State-of-the-Art of Research on Damage Mechanism and Mechanical Property of the Composite Structures after Exposure to Fire

The Open Civil Engineering Journal ◽

10.2174/1874149501711010867 ◽

2017 ◽

Vol 11 (1) ◽

pp. 867-872

Author(s):

Chunyang Liu ◽

Yuzhuo Wang ◽

Xin Liu ◽

Dabin Yang ◽

Xiuli Du

Keyword(s):

Mechanical Property ◽

Composite Structure ◽

Composite Structures ◽

Research Method ◽

State Of The Art ◽

Research Work ◽

Damage Mechanism ◽

Frame Structure ◽

The Past ◽

Static Experiment

Introduction: Based on the comparative and analytical studies on the research work conducted on the damage mechanism and mechanical property of the composite structure after exposure to fire, the research method and the research achievements are summarized and reviewed. Results and Conclusion: The achievements are mainly obtained from the studies on the beam (floor-slab) component, beam-column joints and the frame structure by the means of the axial compression static experiment or quasi static experiment in the past. Finally, some issues that still need to be studied are also discussed from three prospects.

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Computational Modeling of Polymer Matrix Composites

10.31224/osf.io/a76hr ◽

2018 ◽

Author(s):

DC Pham

Keyword(s):

Mechanical Properties ◽

Composite Material ◽

Composite Materials ◽

Polymer Matrix ◽

Composite Structures ◽

Computational Models ◽

Polymer Matrix Composites ◽

Failure Criteria ◽

Matrix Composites ◽

Stiffness Reduction

Applications of polymer matrix composites are growing in aerospace and offshore industries due to the light-weight and good mechanical properties of composite materials. The design of composite materials can be made at macroscopic level in which the composite mechanical properties can be tailored to offer the most desired performance of composite structures. Understanding on mechanical behavior of the composite material may require detailed investigations at the microscopic level involving the behaviour of the composite constituents such as the fiber, the polymer matrix and the fiber/matrix interface under macroscopic loads. Composite failure criteria are often employed to evaluate the failure of composite material and its constituents. Computational damage models can be then developed to reflect the stiffness reduction of the material once damage at the macro- and micro- scales of the composite is indicated. The successful prediction of composite structures relies on consistent computational models which can capture the mechanical behaviour of composite materials at different length scales.

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FORECASTING CHARACTERISTICS OF COMPOSITE STRENGTH ON THE BASIS OF PREFORMS IN ELEMENTS OF BUILDING STRUCTURES

Municipal economy of cities ◽

10.33042/2522-1809-2020-6-159-2-9 ◽

2020 ◽

Vol 6 (159) ◽

pp. 2-9

Author(s):

A. Kondratiev ◽

O. Andrieiev

Keyword(s):

Composite Material ◽

Composite Materials ◽

Composite Structures ◽

High Speed ◽

Mechanical Characteristics ◽

Unidirectional Composite ◽

Test Material ◽

Practical Implementation ◽

Building Structures ◽

Physical And Mechanical Characteristics

Currently, wicker composite structures for various purposes are widely used in many industries. The use of such preforms allows to provide the possibility of automation of production, high speed and efficiency of the process of manufacturing polymeric composite materials and structures based on them. Knowledge of their properties allows you to optimize the production of structures with the necessary parameters during design. In the article the model of composite material on the basis of wicker reinforcement was further developed. For the practical implementation of this model, it is sufficient to test material samples with three different angles between the harnesses, for example, ± 30º, ± 45º and ± 60º. A mathematical description of the model is given. The model made it possible to predict the physical and mechanical characteristics of the composite material when it is laid out on curved surfaces. At the same time some fictitious limits of durability of a composite are defined. This is due to the fact that each value of the angle between the harnesses corresponds to its physical and mechanical characteristics of the unidirectional composite material. In this case, the ultimate strength curves necessarily pass through the points corresponding to the experimental data. The article shows that the possible deviations of the strength limits in the range of angles between the harnesses will lie within the range of characteristics obtained by testing. The article shows that in the realized interval of angles between the harnesses, almost any polynomial criterion of strength will accurately describe the strength of the composite reinforced with a braided sleeve. The obtained parameters, in contrast to the existing ones, allow to predict the strength characteristics of the composite on the basis of braided sleeves depending on the positioning and location of the material on the forming surface. The obtained results are the basis for solving the problems of calculating the strength of building structures from composite materials based on wicker preforms.

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Fabrication of Composite Materials from Fibrous Precursors Using Paper Making Procedures

MRS Proceedings ◽

10.1557/proc-197-297 ◽

1990 ◽

Vol 197 ◽

Author(s):

J. N. Zabasajja ◽

Soonho Ahn ◽

Tony Wu ◽

A. Krishnagopalan ◽

B. J. Tatarchuk

Keyword(s):

Composite Materials ◽

Composite Structure ◽

Composite Structures ◽

Structural Integrity ◽

High Energy ◽

High Energy Density ◽

Kinetic Measurements ◽

Paper Making ◽

Bonded Composite ◽

Sinter Bonding

ABSTRACTNovel composite materials have been fabricated from fibrous precursors using paper making procedures. Small metal fibers (2 μm in diameter) and carbon fiber bundles (20 μm in diameter) were combined with cellulose (as the binding agent) into an interwoven paper preform. The composite paper preform was then sintered at high temperatures in a controlled atmosphere, subsequently removing the cellulose and forming a sinter-bonded composite structure. The sinter bonding of the metal locked the metal fibers and provided high mechanical flexibility and structural integrity to the resulting composite structure. The composite structures were characterized using scanning electron microscopy, electrochemical and kinetic measurements. The optimization of these structures for high energy density applications was demonstrated through these measurements.

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Experimental research on effect of opening configuration and reinforcement method on buckling and strength analyses of spar web made of composite material

Science and Engineering of Composite Materials ◽

10.1515/secm-2021-0018 ◽

2021 ◽

Vol 28 (1) ◽

pp. 190-203

Author(s):

Lin Sen ◽

Li Chenxi ◽

Hu Ying ◽

Cong Hao

Keyword(s):

Composite Material ◽

Composite Materials ◽

Experimental Research ◽

Commercial Aircraft ◽

Strength Performance ◽

Structural Reinforcement ◽

Web Structure ◽

Buckling Stability ◽

Reinforcement Efficiency

Abstract This study experimentally investigates the effect of the opening configuration on the buckling stability and bearing performance of a structural beam web used in a commercial aircraft made of composite materials. The buckling and strength analyses on three opening configurations (circular, oblong, and rhombic) were carried out using test samples with identical web surface size. It is found that the rhombic opening has the minimum effect on the buckling stability and strength of the structure. To compensate for the effect of the opening, two reinforcement methods, using reinforcement rib and thickening the sample, were also investigated in this study. It is concluded that thickening the sample can more effectively improve the buckling stability and strength performance of beam web structure and hence has relatively higher structural reinforcement efficiency.

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Numerical Modeling of an Existing RC Frame for the Design of Strengthening through Composite Materials

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.259.215 ◽

2017 ◽

Vol 259 ◽

pp. 215-220

Author(s):

Roberto Cerioni ◽

Lorenzo Ferrari ◽

Filippo Leurini

Keyword(s):

Numerical Modeling ◽

Composite Material ◽

Composite Materials ◽

Fe Analysis ◽

Fiber Reinforced Polymers ◽

Rc Frame ◽

Existing Buildings ◽

Failure Condition ◽

Reinforced Polymers ◽

Strengthening Technique

In recent years, different strengthening techniques adopting composite materials have been proposed. Among these, FRP strengthening technique, which adopts Fiber-Reinforced Polymers strips, has become quite popular for the rehabilitation and seismic improvement of existing buildings. In this paper, this composite material is adopted to design the strengthening of an existing Reinforced Concrete (RC) frame. Firstly, its behavior is considered up to failure condition by performing a Finite Element (FE) analysis that incorporates a non-linear constitutive relation for the material named 2D-PARC. Then, based on the obtained FE analysis results, a strengthening design of the frame by adopting composite materials is developed and discussed.

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