scholarly journals Study Smart-layer effect on the physical and mechanical characteristics of the samples from polymer composite materials under quasi-static loading

2020 ◽  
pp. 188-200
Author(s):  
G. S Shipunov ◽  
M. A Baranov ◽  
A. S Nikiforov ◽  
D. V Golovin ◽  
A. A Tihonova
Keyword(s):  
Composite Materials ◽  
Optical Fiber ◽  
Polymer Composite ◽  
Static Loading ◽  
Mechanical Characteristics ◽  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Polymer Composite Materials ◽  
Physicomechanical Characteristics ◽  
Physical And Mechanical Characteristics

Currently, developments of the so-called Smart-constructions are relevant as they enable a real-time monitoring of changes in required values. Smart designs are widely used in the construction, automotive and aerospace industries. Technologies of creating products from polymer composite materials make it possible to introduce various sensors directly into the structure of a material, thereby create systems monitoring the state of structures. The most recommended for such implementation are fiber-optic sensors, which have a number of advantages over other sensors (luminescent, strain gauge, piezoelectric ones). However, when introducing the fiber-optic sensors, there is a number of difficulties, which are primarily associated with fragility of the optical fiber and lead to the breakdown of fiber-optic lines. As a result, it is necessary to develop a Smart-layer that will protect the optical fiber leads and will not significantly change the physical and mechanical characteristics. This paper aims to determine the stiffness and strength characteristics of samples made of polymer composite materials: reference samples, samples with embedded fiber-optic sensors, samples with embedded Smart-layers. In this work, a Smart-layer is understood as a coating that protects the fiber-optic sensors at the stage of implementation into a structure. The paper considers the following configurations of the Smart-layer: polymer reinforced mesh, polyamide and polyurethane layer. We analyzed and compared the influence of the embedded optical fiber and various configurations of the Smart-layer in the composite structure on the physicomechanical characteristics of the samples obtained under quasi-static loading (tension, compression, and interlayer shear). For a more detailed analysis of using the fiber-optic sensors and various configurations of the Smart-layer, the corresponding loads were simulated to assess their mechanical behavior. Based on the obtained physical and mechanical characteristics, a specific configuration of the Smart-layer was selected and justified for further researches.

Carbon and Glass Fibers for Polymer Composites

2019 ◽  
Vol 816 ◽  
pp. 19-26 ◽  
Author(s):  
Aues A. Beev ◽  
S.Yu. Khashirova ◽  
D.A. Beeva ◽  
M.U. Shokumova ◽  
R.B. Tkhakakhov
Keyword(s):  
Composite Materials ◽  
Polymer Composites ◽  
Polymer Composite ◽  
Mechanical Characteristics ◽  
Glass Fibers ◽  
Polymer Composite Materials ◽  
Surface Activation ◽  
Physical And Mechanical Characteristics

The paper gives a brief description of carbon and glass fibers used to obtain polymer composite materials with high thermal, physical and mechanical characteristics. Some methods for surface activation of carbon and fiberglass, which will be used to increase the adhesion interactions at the fiber-polymer boundaries, are presented.

Surface Activation of Carbon and Glass Fibers

2019 ◽  
Vol 816 ◽  
pp. 1-8
Author(s):  
Aues A. Beev ◽  
S.Yu. Khashirova ◽  
Azamat L. Slonov ◽  
Ismel V. Musov ◽  
D.A. Beeva ◽  
...  
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Chemical Treatment ◽  
Mechanical Characteristics ◽  
Glass Fibers ◽  
Practical Interest ◽  
Polymer Composite Materials ◽  
Surface Activation ◽  
Activated Surface ◽  
Physical And Mechanical Characteristics

The paper presents the results of studies on the activation of the surface of carbon and glass fibers by thermal and chemical treatment with acids and mixtures of acids. Carbon and glass fibers with an activated surface are of practical interest for the production of polymer composite materials with high thermal, physical and mechanical characteristics.

scholarly journals A study into the scale effect on the strength properties of polymer composite materials

2019 ◽  
Vol 5 (2) ◽  
pp. 103-108
Author(s):  
Valentina V. Kiryushina ◽  
Yuliya Yu. Kovaleva ◽  
Petr A. Stepanov ◽  
Pavel V. Kovalenko
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Scale Effect ◽  
Mechanical Characteristics ◽  
Full Scale ◽  
Sample Thickness ◽  
Polymer Composite Materials ◽  
Test Machine ◽  
Test Results ◽  
Laboratory Sample

Polymer composite materials (PCM) are used extensively and are viewed as candidates for application in various industries, including nuclear power. Despite a variety of methods and procedures employed to investigate the mechanical characteristics of PCMs, the use of the laboratory sample mechanical test results to design and model large-sized structures is not always fully correct and reasonable. In particular, one of the problems is concerned with taking into account the scale parameter effects on the PCM strength and elastic characteristics immediately in the product. The purpose of the study is to investigate the scale effects on the mechanical characteristics of glass reinforced plastics using phenolformaldehyde and silicon-organic binders and a fabric quartz filler. Samples of four different standard sizes under GOST 25604-82 and GOST 4648-2014 were tested for three-point bending using an LFM-100 test machine to estimate the scale effect. The thicknesses of the model samples were chosen with regard for the wall thicknesses of full-scale products under development or manufactured commercially and the test machine features, and varied in the limits of 1.6 to 7.5 mm. The tests showed that strength decreased as the sample thickness was increased to 3 mm and more both at room and elevated (200 to 500 °C) temperatures, which can be described by an exponential function based on the Weibull statistical model. The values of the Weibull modulus that characterizes the extent of the scale effect on the strength of the tested materials were 4.6 to 6.7. The average bend strength in the sample thickness range of 3 mm and less does not vary notably or tends to increase slightly as the thickness is increased. This fact makes it possible to conclude that estimation of allowable stresses in a thin-wall product requires the use of test results for samples with a thickness that is equal to the product wall thickness since standard samples may yield overestimated allowable stress values and lead, accordingly, to incorrect calculations of the strength factor. The results obtained shall be taken into account when defining the allowable levels of operation for full-scale products and structures of polymer composites based on the laboratory sample strength data as well as when estimating their robustness as a characteristic of the product’s fail-safe operation.

Thermoplastic Characteristics of Polymer Composite Materials Used for the Manufacture of Ship Systems Pipelines

2020 ◽  
Vol 869 ◽  
pp. 7-14
Author(s):  
Gia Viet Ngo
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Raw Materials ◽  
Fire Hazard ◽  
Sheet Material ◽  
Polymer Composite Materials ◽  
Domestic Industry ◽  
Thermoplastic Matrix ◽  
Materials Used ◽  
Physical And Mechanical Characteristics

The article presents thermoplastic characteristics of polymer composite materials developed on domestic raw materials on a thermoplastic matrix-injection material of the VTP-7 brand based on polyaryl sulfones (polysulfone PSU) plastic and sheet material of the VKU-44 brand based on PSU and carbon unidirectional tape ELUR 0.08 PA. In the article, the author considered the modification method of thermoplastic polymers to impart functional properties and mechanisms of their action. It is shown that the developed materials have no analogues in the domestic industry. According to the level of physical and mechanical characteristics, fire-hazard properties and heat resistance, the developed polymer composite materials (PCM) fully meets the requirements for modern thermoplastic PCM, and is not inferior to foreign analogues.

Application of optical fiber as strain gauges in polymer composite materials

2011 ◽  
Vol 4 (3) ◽  
pp. 246-251 ◽  
Author(s):  
E. N. Kablov ◽  
D. V. Sivakov ◽  
I. N. Gulyaev ◽  
K. V. Sorokin ◽  
M. Yu. Fedotov ◽  
...  
Keyword(s):  
Composite Materials ◽  
Optical Fiber ◽  
Polymer Composite ◽  
Polymer Composite Materials ◽  
Strain Gauges

scholarly journals A study into the scale effect on the strength properties of polymer composite materials

2019 ◽  
Vol 5 (2) ◽  
pp. 13-18
Author(s):  
Valentina V. Kiryushina ◽  
Yuliya Yu. Kovaleva ◽  
Petr A. Stepanov ◽  
Pavel V. Kovalenko
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Scale Effect ◽  
Mechanical Characteristics ◽  
Full Scale ◽  
Sample Thickness ◽  
Polymer Composite Materials ◽  
Test Machine ◽  
Test Results ◽  
Laboratory Sample

Polymer composite materials (PCM) are used extensively and are viewed as candidates for application in various industries, including nuclear power. Despite a variety of methods and procedures employed to investigate the mechanical characteristics of PCMs, the use of the laboratory sample mechanical test results to design and model large-sized structures is not always fully correct and reasonable. In particular, one of the problems is concerned with taking into account the scale parameter effects on the PCM strength and elastic characteristics immediately in the product. The purpose of the study is to investigate the scale effects on the mechanical characteristics of glass reinforced plastics using phenolformaldehyde and silicon-organic binders and a fabric quartz filler. Samples of four different standard sizes under GOST 25604-82 and GOST 4648-2014 were tested for three-point bending using an LFM-100 test machine to estimate the scale effect. The thicknesses of the model samples were chosen with regard for the wall thicknesses of full-scale products under development or manufactured commercially and the test machine features, and varied in the limits of 1.6 to 7.5 mm. The tests showed that strength decreased as the sample thickness was increased to 3 mm and more both at room and elevated (200 to 500 °C) temperatures, which can be described by an exponential function based on the Weibull statistical model. The values of the Weibull modulus that characterizes the extent of the scale effect on the strength of the tested materials were 4.6 to 6.7. The average bend strength in the sample thickness range of 3 mm and less does not vary notably or tends to increase slightly as the thickness is increased. This fact makes it possible to conclude that estimation of allowable stresses in a thin-wall product requires the use of test results for samples with a thickness that is equal to the product wall thickness since standard samples may yield overestimated allowable stress values and lead, accordingly, to incorrect calculations of the strength factor. The results obtained shall be taken into account when defining the allowable levels of operation for full-scale products and structures of polymer composites based on the laboratory sample strength data as well as when estimating their robustness as a characteristic of the product’s fail-safe operation.

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