Across-the-Thickness Gradient of the Interlaminar Shear Strength of a CFRP After Its Long-Term Exposure to a Marine Climate

Startsev, V.O.

doi:10.1007/s11029-016-9570-7

Cited by 8 publications

(6 citation statements)

References 2 publications

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“…A similar pattern of change in τ was found in CFRP KMU-9TK after 10 year of exposure in a moderately warm climate [ 24 ]. Gradients of strength, elastic moduli, coefficient of linear thermal expansion, and glass transition temperature of the polymer matrix over the thickness of the plates form not only in reinforced plastics [ 23 , 24 ] but also in separately-cured epoxy compounds [ 25 ] and thermoplastic polymers [ 26 ].…”

Section: Introductionsupporting

confidence: 72%

“…In the research [ 24 ], the temperature dependences of the relative thermal dilatation

of KMU-9TK carbon fiber plastic along the carbon fibers from the surface layers and the central part of the plate were presented. According to the results of the study, the author came to the conclusion that the shrinkage characteristics of carbon fibers are significantly higher at temperatures exceeding the glass transition temperature of the polymer matrix for the surface layer irradiated by the sun, due to a decrease in

.…”

Section: The Role Of the Main Factors On The Uneven Aging Of Pcmmentioning

confidence: 99%

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Contributing Factors of Uneven Climatic Aging for Polymeric Composite Materials: Methods and Modelling

et al. 2023

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Regarding a wide variety of PCMs, the materials’ strength properties which decrease no more than 20% after 30 years of operation are of special interest. One of the important regularities of the climatic aging of PCMs is the formation of gradients of mechanical parameters across the thickness of the plates. The occurrence of gradients must be taken into account when modeling the strength of PCMs for long periods of operation. At present, there is no scientific basis for the reliable prediction of the physical-mechanical characteristics of PCMs for a long period of operation in the world of science. Nevertheless, “climatic qualification” has been a universally recognized practice of substantiating the safe operation of PCMs for various branches of mechanical engineering. In this review, the influence of solar radiation, temperature, and moisture according to gradients of mechanical parameters across the thickness of the PCMs are analyzed according to the data of dynamic mechanical analysis, linear dilatometry, profilometry, acoustic emission, and other methods. In addition, the mechanisms of uneven climatic PCM aging are revealed. Finally, the problems of theoretical modeling of uneven climatic aging of composites are identified.

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Section: Introductionsupporting

confidence: 72%

“…In the research [ 24 ], the temperature dependences of the relative thermal dilatation

.…”

Section: The Role Of the Main Factors On The Uneven Aging Of Pcmmentioning

confidence: 99%

Contributing Factors of Uneven Climatic Aging for Polymeric Composite Materials: Methods and Modelling

et al. 2023

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“…giving 40-60 MPa for composites cured at 190-220°C. Such stresses in polymer matrices exceed the interlayer shear strength, equal to 20-40 MPa [12,27]. For example, in [32], a micromechanical modeling of internal stresses causing cracking of epoxy matrices in a CFRP at temperatures from 25 to -50°C was carried out.…”

Section: Causes For Internal Stresses In Pcmsmentioning

confidence: 99%

“…The examples considered illustrate the noticeable effect of internal stresses on changes in the mechanical parameters of PCMs at the initial stages of aging (thermal [24, 25, 53-55, 66, 74], thermal and humid [25,[61][62][63][64][65]67], climatic [8][9][10][11][12][13][14][15][16][17], [23,27], and in open space [72]), when the threshold number N 0 of thermal cycles was exceeded. However, due to relaxation of internal stresses at later stages, a certain limiting state of physicochemical transformations and microfaults is reached [49], and then the change in the indices of material characteristics is significantly reduced.…”

Section: Relaxation Of Internal Stresses During Thermocycling Of Pcmsmentioning

confidence: 99%

“…In [26], the level of internal stresses in a unidirectional fiberglass based on a polyester binder cooled to -60°C reached 62 MPa. This value is commensurable with the ultimate tensile [12] or compression strength [27] of the material and should be taken into account when analyzing the reasons for the formation of microcracks during daily and seasonal temperature fluctuations in open climatic conditions [23].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Internal Stresses on the Aging of Polymer Composite Materials: a Review

Каблов

Startsev

2021

Mech Compos Mater

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The formation of internal stresses in polymer composite materials (PCMs) caused by different elastic moduli and thermal expansion coefficients of polymer resin and reinforcing fibers, as well as by swelling due to the moisture uptake is discussed. The influence of thermal cycles on the internal stresses and strength of the materials was studied in dry and wet atmospheres. It shown that thermal cycles cause a periodic jumps in the stresses at lowfrequency mechanical loadings, during which the mechanical properties are degraded due to the formation of microscopic cracks in the polymer matrix. The relative changes in the strength, elastic modulus, glass-transition temperatures, moisture diffusion coefficient, and other PCM physical characteristics are proportional to the logarithm of the number of cycles and also depend on the form and size of specimens, amplitude, conditions, and length of thermal cycles. A prolonged action of external actions relaxes the internal stresses and reduces their influence on the aging of PCMs.

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Determination of the Glass-Transition Temperature of GRPS and CFRPS Using a Torsion Pendulum in Regimes of Freely Damped Vibrations and Quasi-Stastic Torsion of Specimens

Startsev¹,

Лебедев

Molokov³

2018

Mech Compos Mater

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Across-the-Thickness Gradient of the Interlaminar Shear Strength of a CFRP After Its Long-Term Exposure to a Marine Climate

Cited by 8 publications

References 2 publications

Contributing Factors of Uneven Climatic Aging for Polymeric Composite Materials: Methods and Modelling

Contributing Factors of Uneven Climatic Aging for Polymeric Composite Materials: Methods and Modelling

The Influence of Internal Stresses on the Aging of Polymer Composite Materials: a Review

Determination of the Glass-Transition Temperature of GRPS and CFRPS Using a Torsion Pendulum in Regimes of Freely Damped Vibrations and Quasi-Stastic Torsion of Specimens

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