The Effect of Climatic Factors and Mechanical Loading on the Properties of Carbon-Fibre-Reinforced Plastic Based on An Epoxy Binder

Kirillov, V. N.; Ефимов, В. А.; Шведкова, А К

doi:10.1177/0307174x1304000503

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…One of the main manifestations of the impact of environmental factors on PCM is the saturation of their structure with moisture [20][21][22]. In this case, the capillary effect of moisture penetration through cracks and pores in the structure of the matrix and the IFL is important, which leads to the wedging of the structure when moving along the capillary (Rebinder effect).…”

Section: Resultsmentioning

confidence: 99%

“…According to research materials [20][21][22], aging processes and moisture accumulating in the porous structure, diffusing into the matrix and adsorbing on the surface of the fibers in the interfacial layer (IFS) have the greatest effect on the strength and rigidity of PCM products. At the same time, there is practically no information about the effect of pretreatment of cured PCMs in a UHF electromagnetic field on the change in their rigidity after exposure in natural environmental conditions.…”

Section: Problem Statementmentioning

confidence: 99%

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Change of Rigidity of PCM Modified in an Ultrahigh Frequencies Electromagnetic Field under the Action of External Factors

Злобина

2021

MSF

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Experimental studies of bending deformation of carbon - and fiberglass samples after 8-month exposure in full-scale conditions were performed and the modulus of transverse elasticity was determined. It was found that the influence of the external environment on fiberglass samples is more significant. For carbon fiber, there was an average decrease of 7.1%, and for fiberglass-by 14%. Modification of samples in ultrahigh frequencies (UHF) electromagnetic field reduces the negative influence of the environment: the values of the transverse elastic modulus of carbon fiber and fiberglass samples are reduced by 5% and 11%, respectively. It is shown that the UHF electromagnetic field in rational modes can increase the modulus of transverse elasticity of carbon fiber by (27-30)%, fiberglass – by (20.8-25.6)% with a significant increase in the uniformity of this parameter. Experimental studies of the bending deformation of carbon-and fiberglass specimens after 8-month exposure in natural conditions have been carried out, and the shear elastic modulus has been determined. It has been established that the influence of the external environment on fiberglass samples is more significant. For carbon fiber reinforced plastic, a decrease was noted on average by 7.1%, for fiberglass - by 14%. Modification of samples in a microwave electromagnetic field helps to reduce the negative influence of the external environment: the values of the shear modulus of the prototypes of carbon fiber reinforced plastic and fiberglass are reduced by 5% and 11%, respectively. It is shown that the microwave electromagnetic field in rational modes allows increasing the transverse elastic modulus of carbon fiber reinforced plastic by (27-30)%, fiberglass - by (20.8-25.6)% with a significant increase in the uniformity of this parameter.

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Section: Resultsmentioning

confidence: 99%

Section: Problem Statementmentioning

confidence: 99%

Change of Rigidity of PCM Modified in an Ultrahigh Frequencies Electromagnetic Field under the Action of External Factors

Злобина

2021

MSF

View full text Add to dashboard Cite

show abstract

“…One of the main manifestations of the impact of environmental factors on PCM is the saturation of their structure with moisture [20][21][22]. Of great importance is the capillary effect of moisture penetration through cracks and pores, which leads to wedging of the structure as it moves through the capillary (Rebinder effect).…”

Section: Resultsmentioning

confidence: 99%

“…During the research carried out in 2015-2020 the author experimentally established an increase in the strength properties of cured carbon fiber and fiberglass after impact on them within 1-2 minutes by a UHF of tne electromagnetic field with a frequency of 2450: limiting shear stresses by an average of 40%, three-point bending -by (7-13)%, interlayer move -by (14-16)% [16][17][18][19]. However, the issue of maintaining the achieved effects under the influence of the time factor and under the conditions of external climatic influences of the environment remains unclear, which is important because, according to the research materials [20][21][22], it is the aging processes and moisture that exert the greatest influence on the performance of PCM products accumulating in a porous structure, diffusing into the matrix and adsorbing on the fiber surface in the interfacial layer (IFL). At the same time, the external environment has the most negative effect on structural elements made of fiberglass due to its increased hydrophilicity in comparison with carbon fiber…”

Section: Problem Statementmentioning

confidence: 99%

Fiberglass: Lateral Loads from Climatic and Temporary Factors

Злобина

2021

MSF

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The influence of modification of fiberglass in the cured state in the microwave electromagnetic field on the value of the limit stresses is significantly manifested when testing samples in the initial state. The increase in limit voltages is on average 7%. Tests of modified samples after exposure in full-scale conditions showed a decrease in the effect with an increase in the exposure time from 6% for exposure of 3 months to 3% for exposure of 8 months. This significantly increases the uniformity of the bending strength values in the batch, which is manifested in a decrease in the coefficient of variation of limit stresses relative to the control samples by 33%. Functional dependencies in the form of 2nd-order polynomials are obtained, which allow predicting the stability of products made of modified fiberglass for long-term operation under the influence of environmental factors with a confidence of up to 98%.

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“…The works [7,8] devoted to PCM on the basis of epoxy binders were studying the influence of climatic factors through accelerated hygrothermal and natural climatic tests at static and cyclic loads on the change of residual strength of a material via bending, moisture content and structural transformations in the glass transition range of a material. It is revealed that the static load increases the moisture content, reduces the bending strength and glass transition temperature, as well as the glasstransition range.…”

Section: Introductionmentioning

confidence: 99%

Study of Microorganisms on Polymer Composite Materials in Frigid Climate Conditions

Kychkin¹,

Лебедев²,

Erofeevskaya³

et al. 2019

Proceedings of the International Symposium "Engineering and Earth Sciences: Applied and Fundamental Research" Dedicated to the

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The paper presents research findings on extraction and identification of bacterial and mycelial forms of microorganisms on polymer composite materials under the influence of extreme frigid climate for further study of the destruction of these materials. The study made it possible to take wipe samples and scrapes from basalt plastic fittings, basalt-and fiberglass plastic on open stands in frigid climate, as well as basalt plastic pipes used for water disposal in the Arctic zone of Yakutia. The following fungal species were identified from microorganisms-destructors of polymer composite materials via biochemical tests: Aspergillus fumigatus, Aspergillus niger, Aspergillus albus, Trichoderma viridans, Penicillium sp., Fusarium roseum. At least two species of spore-forming bacillary strains Bacillus atropheus and Bacillus subtilis were defined from the bacterial group.

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The Effect of Climatic Factors and Mechanical Loading on the Properties of Carbon-Fibre-Reinforced Plastic Based on An Epoxy Binder

Cited by 4 publications

References 6 publications

Change of Rigidity of PCM Modified in an Ultrahigh Frequencies Electromagnetic Field under the Action of External Factors

Change of Rigidity of PCM Modified in an Ultrahigh Frequencies Electromagnetic Field under the Action of External Factors

Fiberglass: Lateral Loads from Climatic and Temporary Factors

Study of Microorganisms on Polymer Composite Materials in Frigid Climate Conditions

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