Micromechanical analysis of nonwoven materials with tunable out-of-plane auxetic behavior

Rawal, Amit; Sharma, Sumit; Kumar, Vijay; Rao, P.V.; Saraswat, Harshvardhan; Jangir, Nitesh Kumar; Kumar, R. Jeevan; Hietel, Dietmar; Dauner, Martin

doi:10.1016/j.mechmat.2018.11.004

Cited by 16 publications

(13 citation statements)

References 22 publications

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“…Moreover, the plastic deformation rate in the MD decreased from 37.1 to 19.8% with the increase in the PBE ratio from 0 to 80 wt% and the elastic recovery rate in the MD increased from 62.9 to 80.3% under the same conditions, and the characteristic parameters of samples were shown in Tables S2 to S4. This change may be attributed to two factors: slipping and aligning between the fibers under tension leading to the formation and extension of fibers displayed in the deformation mechanisms as identified in previous studies [48,49]; and fibers with high PBE content exhibiting high deformation ability. From the above, excellent elasticity should be attributed to the introduction of PBE and the binary structure of the fibrous membranes.…”

Section: Resultsmentioning

confidence: 77%

Binary structured polypropylene-/propylene-based elastomer fibrous membranes with enhanced flexibility

Zhang

Zhen

Liu

et al. 2020

Journal of Industrial Textiles

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Polypropylene (PP) fibrous membranes are widely used in medical and healthcare due to its sustainability. However, pristine PP fibrous membranes show poor flexibility, which limits their advanced functional application in medical and healthcare. Therefore, to improve the flexibility of PP fibrous membranes, propylene-based elastomer (PBE), a copolymer compatible with PP, was introduced by using the melt blowing technique in this study. The SEM images show that the PP/PBE fibrous membrane samples expressed a binary structured network morphology consisting of fibers with a diameter distribution ranging from 0.4 to 15 µm. With an increase in PBE mass ratio from 15 to 80 wt%, the frequency of fibers with a diameter <3 µm increased from 48.6 to 61.2%, thus making the elastic recovery rate in the machine direction (MD) increase from 62.9 to 80.3% and softness values increase from 15.88 to 54.31. Meanwhile, air permeability increased from 856 to 2257 m3/m2 · h as the mass per unit area of the samples decreased from 129.9 to 40.1 g/m2. This work provides an alternate method for producing flexible fibrous membranes that have potential for application in items such as surgical gown cuffs, bandages, and face mask ear loops.

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Section: Resultsmentioning

confidence: 77%

Binary structured polypropylene-/propylene-based elastomer fibrous membranes with enhanced flexibility

Zhang

Zhen

Liu

et al. 2020

Journal of Industrial Textiles

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“…Such structures induced in-plane auxetic behavior of the nonwoven fabrics. Bhullar et al [ 24 , 25 ] also used the rotating square geometry in polycaprolactone nanofiber webs (membranes) made by the electrospinning procedure and laser cutting. Rawal et al [ 24 ] developed 3D polyester needle-punched webs with out-of-plane auxetic behavior by adjusting the needle boards‘ direction in a needle-punching process (and, consequently, the proportion of fibers in the through-thickness direction of the webs).…”

Section: Introductionmentioning

confidence: 99%

“…Rawal et al [ 24 ] developed 3D polyester needle-punched webs with out-of-plane auxetic behavior by adjusting the needle boards‘ direction in a needle-punching process (and, consequently, the proportion of fibers in the through-thickness direction of the webs). Rawal et al [ 25 ] analyzed needle-punched nonwoven fabrics with out-of-plane auxetic behavior by deconstructing the anisotropic structure, and presented analytical models of the modulus and an in-plane Poisson’s ratio. Verma et al [ 26 ] developed 3D polyester needle-punched webs with out-of-plane auxetic behavior, based on the heat compression protocol after fabrication of a needle-punched fabric.…”

Section: Introductionmentioning

confidence: 99%

In-Plane Deformation Behavior and the Open Area of Rotating Squares in an Auxetic Compound Fabric

et al. 2022

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A conventional compound fabric was used to develop a modern, multifunctional material with an auxetic behaviour and a tailored open area for particle filtration. Such material was produced using traditional textile technology and laser cutting, to induce a rotating squares unit geometry. The behaviour was investigated of three different rotating unit cell sizes. The laser slit thickness and the length of the hinges were equal for all three-unit cells. The tensile properties, Poisson’s ratio and auxetic behaviour of the tested samples were investigated, especially the influence of longitudinal displacement on the fabric’s open area and the filtered particle sizes (average and maximum). Results show that the developed compound fabric possesses an average negative Poisson’s ratio of up to −1, depending on the applied auxetic geometry. The larger rotating cell size samples offer a higher average negative Poisson’s ratio and a higher breaking strength due to the induced slits. The findings highlight the usefulness of patterned cuts in conventional textile materials to develop advanced auxetic textile materials with tailored geometrical and mechanical properties.

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“…1 , 3 , 5–13 The same definition can be applied to textiles materials, such as, braiding, woven, knitted fabrics and nonwoven, which permit to create complex and specific structural geometries with NPR. 10 , 12 , 14 , 15…”

Section: Introductionmentioning

confidence: 99%

Energy absorption from composite reinforced with high performance auxetic textile structure

Steffens

Oliveira

Fangueiro

2020

Journal of Composite Materials

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The objective of this study is to analyze the impact behavior on the basis of energy approach of weft knitted structures, namely a jersey composite and an auxetic composite using high performance yarns. Weft knitted fabrics were produced with the same structural and machine parameters, using 100% para-aramid and hybrid (47% para-aramid and 53% polyamide) structure. Composite fabrication was achieved through hand lay-up using epoxy resin. Negative Poisson ratio of the reinforcing auxetic fabric was transferred from the fabric to the composite developed. Results obtained by drop weight dart impact test show that the impact experiment with different impact loads confirmed the auxetic composites, regardless de material composition, have an increase in the total energy absorption compared to jersey reinforced composite, approximately 2.5 and 4 times more for para-aramid and hybrid composite, respectively. Auxetic composites developed within this work present great potential for applications in different areas, mainly where energy absorption is a key factor to be considered, such as in protection, sports among others.

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Micromechanical analysis of nonwoven materials with tunable out-of-plane auxetic behavior

Cited by 16 publications

References 22 publications

Binary structured polypropylene-/propylene-based elastomer fibrous membranes with enhanced flexibility

Binary structured polypropylene-/propylene-based elastomer fibrous membranes with enhanced flexibility

In-Plane Deformation Behavior and the Open Area of Rotating Squares in an Auxetic Compound Fabric

Energy absorption from composite reinforced with high performance auxetic textile structure

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