Stress relaxation, creep, and recovery of carbon fiber non-crimp fabric composites

Ornaghi, Heitor Luiz; Almeida, José Humberto S.; Monticeli, Francisco Maciel; Neves, Roberta Motta

doi:10.1016/j.jcomc.2020.100051

Cited by 24 publications

(19 citation statements)

References 42 publications

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“…This causes a loss of dimensional stability and load-bearing capability, decreasing the mechanical response. There is lower internal energy, below T g , and the molecular restriction, imposed by the particles, on the amorphous chain segments, can lead to a higher mechanical property (Marrucci 2003;Ornaghi et al 2020b). Hence, the improvement in mechanical properties is directly dependent on the particle capacity to restrain the polymer chain segment motion, in different experimental conditions.…”

Section: ; Neves Et Al 2021a)mentioning

confidence: 99%

A simple model to fit and interpret creep curves-behaviour of modified micro-cellulose particulate composites

Ornaghi¹,

Neves

Kerche

et al. 2022

Cellulose

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Micro crystalline cellulose is largely used to improve thermos-mechanical properties of composites. This study aims to evaluate the creep behaviour of micro-cellulose epoxy-based composites, and the effect of reinforcements' silanization treatment. A new viscoelastic model, based on the generalized logistic function was successfully tested. The results were directly associated with the material's structureproperty relationships. Rigid particles restricted the molecular chain's motion, mainly on the amorphous segments. This difference achieved the needing of more energy, to achieve creep deformation. Then, MCC improved the structural integrity, when incorporated into an epoxy matrix. On one hand, the incorporation of silanized-MCC increased the mechanical behavior of the composite, due to the stiffer structure.Furthermore, the chemical modi cation provided an increment in the glassy plateau, associated with higher thermal energy required to initiate strain of the amorphous polymeric chains. This behaviour conducted in an abrupt decrease of load-bearing capability for the composites. Finally, the proposed model is suitable to be employed in creep curves, aiming to easily interpret the structure-property relationships of this test.

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Section: ; Neves Et Al 2021a)mentioning

confidence: 99%

A simple model to fit and interpret creep curves-behaviour of modified micro-cellulose particulate composites

Ornaghi¹,

Neves

Kerche

et al. 2022

Cellulose

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“…[9] In this sense, not only nano-materials, but several types of reinforcements have been used as a second phase in composites. Some examples include carbon, [10,11] glass [12,13] vegetable fibers, [14,15] clays, [16] carbonaceous (e.g., carbon nanotubes and graphene nanoplatelets [17][18][19][20] ) and polysaccharide (e.g., micro cellulose and chitin nano-whiskers [21][22][23][24] ) particulates, among others. [25,26] Increments in thermal and mechanical properties [27] are the main known benefits of using a dispersed phase in epoxy systems.…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid‐functionalized reinforcements in epoxy‐based composites: A systematic review

et al. 2022

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Several high‐performance reinforcements may be used in epoxy‐based composites. These commonly undergo chemical and/or physical treatments to enhance their interfacial interactions with polymer matrices. One recent technology comprises the use of ionic liquids (IL) as compatibilizers. This strategy may result in the development of composite materials with greater performance or multifunctional characteristics. Herein, an overview in the area of IL‐modified reinforcements and their effect on epoxy‐based composites is presented. The PRISMA protocol was followed for the review, and the focus of these studies was on the modification of carbon nanotubes, followed by graphene/graphite nanoplatelets and bio‐fillers. The most used IL were those based on imidazolium cation, especially 1‐butyl‐3‐methylimidazolium chloride. In most cases, when IL are used, the reinforcement displays stronger interactions with the epoxy matrix, depending the treatment route employed. Improved interfacial interactions are cited as the main reason for the improvement in the composite mechanical and thermal performances. It was also found that strategies for using low IL content, or routes that enable recovery of the salts after fiber/particle treatment, are still required, as well as the study of the influence of different amounts/types of IL on the structure of fillers and their relationships with the composite properties.

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“…Hence the main issue for the reinforcement is the capability of the filler/fiber in restricting the amorphous chain mobility, requiring more energy to deform them. 9,10 Usually, creep tests require long experimental times, large specimens, and high loads (over 35 MPa), making creep experiments time-consuming and costly. 11 Fancey 5,12 mentioned the possibility of predicting the mechanical tensile modulus using a low-stress creep response, aiming to optimize the results.…”

Section: Introductionmentioning

confidence: 99%

“…Hence the main issue for the reinforcement is the capability of the filler/fiber in restricting the amorphous chain mobility, requiring more energy to deform them. 9,10…”

Section: Introductionmentioning

confidence: 99%

Modeling of the creep behavior of epoxy/yerba-mate residue composites

Neves

Kerche

Monticeli

et al. 2022

Journal of Composite Materials

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This work presents the short-term creep behavior of novel epoxy composites reinforced by post-consumed yerba-mate (YM). Particulate composites were manufactured using 5, 10, and 20 wt.% of YM. The composite morphologies were related to the dynamic mechanical and creep behavior at the glassy state (∼30°C). Creep tests were performed using three different stress loads (1.5, 3.0, and 6.0 MPa). Weibull model, Artificial Neural Network (ANN) approach and Response Surface Methodology (RSM) were used to fit the experimental curves and to predict results. A better fit was obtained using the ANN approach than the Weibull model due to the capability of ANN to learn from own data and in fitting complex nonlinear data. The RSM approach proved to be an intelligent and reliable technique to access a higher range of results, reducing experimental time and cost and keeping statistical significance. Also, the present methodology can be extended to model and predict other properties and/or optimize parameters.

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Stress relaxation, creep, and recovery of carbon fiber non-crimp fabric composites

Cited by 24 publications

References 42 publications

A simple model to fit and interpret creep curves-behaviour of modified micro-cellulose particulate composites

A simple model to fit and interpret creep curves-behaviour of modified micro-cellulose particulate composites

Ionic liquid‐functionalized reinforcements in epoxy‐based composites: A systematic review

Modeling of the creep behavior of epoxy/yerba-mate residue composites

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