Toward the link between structural and mechanical properties of fiber aggregates in paper materials

Villette, François; Roscoat, Sabine Rolland Du; Dufour, Frédéric; Bloch, Jean‐Francis; Baroth, Julien; Carré, Bruno

doi:10.1007/s10853-022-07098-8

Cited by 3 publications

(4 citation statements)

References 16 publications

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“…They were made of softwood flexible fibers of arithmetic mean fiber length 𝑙 1.35 𝑚𝑚 (mean length weighted-length 2.1 𝑚𝑚), measured using MOrFI® device (Techpap, Grenoble, France). The papers were manufactured using a Rapid-Köthen sheet former [28] which allowed elaborating "on demand" papers with more or less heterogeneous formations:…”

Section: Methodsmentioning

confidence: 99%

“…Using tensile tests on a population of flocs and antiflocs, the HT paper was shown to exhibit a heterogeneous elastic modulus distribution at mesoscale which can be identified to a lognormale distribution of a mean value 1.5 10 𝑘𝑁/𝑚 and of a standard deviation 7 10 𝑘𝑁/𝑚. The results were taken from the experiments described in [28].…”

Section: Methodsmentioning

confidence: 99%

“…In order to represent material mesostructure, a random field on the finite elements of the Young's modulus was set [39]. The field characteristics were based on the local Young's modulus distribution found for the HT paper [28]. First, the random field 𝐸 that represented the spatial variability of Young's modulus was identified.…”

Section: Stochastic Finite Element Modelling Of Samples Under Tensile...mentioning

confidence: 99%

“…Alzweighi et al [27] highlighted that the local density or local thickness had a larger impact on the local strain field than the variability of anisotropy. In a recent study, Villette et al [28] showed using X-ray tomography and tensile tests on flocs and antiflocs that the local elastic modulus is linearly dependent on the basis weight and that flocs were thicker than antiflocs but had the same porosity. The spatial variability of elastic modulus, and then the strain localization which leads to fracture is mainly due to the thickness variability.…”

Section: Introductionmentioning

confidence: 99%

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Interplay between structural scales and fracture process zone: experimental and numerical analysis on paper as a model material

et al. 2023

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This work deals with fracture mechanisms in quasi-brittle materials, focusing on the characterization of the Fracture Process Zone (FPZ) of specimens under tensile load. Particularly, paper was used as model material. Experiments were conducted on notched and unnotched specimens. Based on an image analysis of these observations, a stochastic finite element model was developed, using both a nonlocal stress-based approach and a discretized random field modelling of the Young's modulus. The proposed methodology allowed characterizing the damage zone and the size of the FPZ, analysing the influence of the mesostructure, composed of flocs (fiber aggregates where the basis weight is larger than the average one) and antiflocs (complement of flocs). The area of the active FPZ and the normalized stress drop were linked using a surface energy dissipated in the active FPZ. The stress drop, until limiting value, increased with the width of the active FPZ. Finally, a relationship between the surface energy and the nonlocal internal length was established.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Stochastic Finite Element Modelling Of Samples Under Tensile...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interplay between structural scales and fracture process zone: experimental and numerical analysis on paper as a model material

et al. 2023

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Heterogeneity characterization of commercial structural papers

Considine,

Keller,

Arvanitis

et al. 2024

Nordic Pulp &Amp; Paper Research Journal

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Evaluation of physical and mechanical heterogeneity in commercial paperboards is needed to promote their use in structural applications, especially within the field of packaging. Understanding the range of their behaviors is needed to compete with other materials in the current marketplace and expand in others. This work describes the physical and stiffness heterogeneities of twelve commercial materials using tensile tests in the cross-machine direction and several inverse analyses. The effects of grammage, thickness, and apparent density on tensile stiffness were evaluated in both the linear elastic and nonlinear regimes. Thickness and density provided the best explanation for elastic heterogeneous behavior in most of the materials; local grammage was not the best descriptor for any material. The analyses used here were not able to provide a good explanation of the nonlinear behavior, which was attributed to the development of large shear strains within the materials as they neared failure. This work provides a methodology for additional heterogeneous behavior examinations.

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Influence mechanism of paper mechanical properties: numerical simulation and experimental verification based on a fiber network

Sun,

Wang,

et al. 2024

Nordic Pulp &Amp; Paper Research Journal

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Paper is a kind of renewable material that exists widely and has important application prospects. However, previous studies have mostly focused on the macromechanical properties of paper but lack micro theory based on paper fiber networks. We present a comprehensive experimental and computational study on the mechanical properties of fibers and fiber networks under the influence of microstructure. A beam-spring model was established based on a beam-fiber network to simulate the behavior of fiber networks. Simulations were performed to demonstrate the influence of fiber microstructural parameters such as fiber bond strength, stiffness, failure strength, size, and network density on mechanical features. Mechanical experiments verified that the fiber bond strength had a greater influence on the paper properties than did the fiber strength. This result is highly consistent with that of the model. All the simulations were validated by experimental measurements. Finally, we provided computational insights into the interfiber bond damage pattern with respect to different fiber microlevels and demonstrated that the proposed beam-spring model can be used to predict the response of fiber networks of paper materials. The above research can be used to optimize the formulation, process, and treatment of paper to meet specific application needs.

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Toward the link between structural and mechanical properties of fiber aggregates in paper materials

Cited by 3 publications

References 16 publications

Interplay between structural scales and fracture process zone: experimental and numerical analysis on paper as a model material

Interplay between structural scales and fracture process zone: experimental and numerical analysis on paper as a model material

Heterogeneity characterization of commercial structural papers

Influence mechanism of paper mechanical properties: numerical simulation and experimental verification based on a fiber network

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