Development of an image analysis technique for measurement of Poisson’s ratio for viscoelastic materials: application to leather

Kabeer, Saqib; Attenburrow, Geoff E; Picton, Philip; Wilson, M.A.A.

doi:10.1007/s10853-012-6789-0

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…However, these do not exceed 30%, concluding that the values are homogeneous. This distribution is explained by the natural origin of samples containing collagen fibres and varying the elastic properties over the entire surface [ 47 ]. Instead, a minor variation of values and a very homogeneous population is highlighted when a synthetic knitted lining with uniform structure properties is introduced (8.3%).…”

Section: Resultsmentioning

confidence: 99%

“…According to the literature, Poisson’s ratio values for most materials range between 0.3 and 0.5. However, it is found that leather can have values of this coefficient above the indicated limit, reaching 1.8, due to the porous structure and fibres, which may approach when the material is stretched in the longitudinal direction [ 47 ]. The results of the present study confirm this.…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, two-layers samples with sheep leather lining, double stitch and 6 mm overlapping showed a medium spread of values (23.4%). The uneven elastic properties of natural materials [ 47 ], the type of skiving in overlapping areas, and the punching by needle cause a weakening of the material by 3–60%, depending on its origin. Additionally, the needle’s shape, the number of stitches and the width of the overlapping cumulative collaborate with this weakness [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

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Mechanical Parameters of Leather in Relation to Technological Processing of the Footwear Uppers

Mihai¹,

Seul²,

Curteza³

et al. 2022

Materials

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This paper aimed to define two critical mechanical properties of leather—Young’s modulus and Poisson ratio—essential to the virtual simulation of the behaviour of the footwear uppers against the manufacturing operations of stitching and perforating. The following technological aspects were considered to analyse the materials from manufacturing conditions point of view: the number of layers (one layer and two layers), the nature of the materials used for uppers subgroups (calfskin-outer upper, sheep leather-lining, polyester knitted fabric-lining), the overlapping width in the stitching area, the number of parallel stitches (single stitch and double stitch), the punching interval and the type of perforations (simple and with eyelets), resulting in nine kinds of samples. Furthermore, the elasticity (Young’s modulus) and lateral contraction (Poisson’s ratio) were calculated during the tensile strength analysis performed on the SATRA STM 466 equipment. Both mechanical parameters are essential to simulate the behaviour of the virtual footwear prototypes in various conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Mechanical Parameters of Leather in Relation to Technological Processing of the Footwear Uppers

Mihai¹,

Seul²,

Curteza³

et al. 2022

Materials

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“…Ershad-Langroudia et al [25] have assessed the viscoelastic behavior of treated historical leather using nanocomposite by dynamic mechanical analysis. However, the works published by some others considered that leather is an elastic material [26]. On the other hand, some scientific works, dealing with the hydrothermal parameters of leather, considered that this material remains saturated over a large part of drying [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

2D model simulating the hydro-rheological behavior of leather during convective drying

Benmakhlouf¹,

Azzouz²,

Hassini³

et al. 2021

Comptes Rendus. Mécanique

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An experimental and numerical study of a two-dimensional spatio-temporal variation of the temperature, moisture content, and mechanical stress during the convective drying process of unsaturated and deformable products (leather) were conducted. The bovine leather sample response under convective drying is described by a mathematical model. The leather sample was modeled by an elastic medium, and the mass, heat, and momentum transfer principles are applied. The numerical results agreed well with the corresponding experimental data. The variation of the internal temperature and moisture content was simulated for different drying conditions. A reduction by 15°C was noted in the optimum temperature for best product quality when the drying air relative humidity was 20%. The cost to achieve a better quality product was found to be minimized due to the decrease in the optimum temperature. The presented simulation results of the elastic material could be applied to the leather, which will reduce the needed time of exposure for predetermined final water content. The damage of the sample is more likely to occur at the beginning of the drying in the time interval of 300-400 s. According to these simulations, the sample's face, which is exposed to the drying air, has the highest stress; therefore, the sample's face is at a high risk of cracking. It is also observed that the risk of damage to the sample corresponding to the maximum level of the stress is higher for the highest drying temperature of 60°C. The peak of the three thicknesses of leather can be achieved for normal stresses in the interval of 60,000 to 140,000 MPa at around 10,000 s.

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“…The identification of the complex Poisson's ratio in the frequency domain can be performed through direct or indirect methods (Pritz, 1998;Tschoegl et al, 2002). In direct methods, the ratio can be obtained from measurements performed directly on the structure (Kabeer et al 2013;Cui et al 2016). On the other hand, in indirect methods, the identification occurs by constructing and evaluating auxiliary complex viscoelastic functions (Young's, shear and/or bulk modulus).…”

Section: Introductionmentioning

confidence: 99%

Indirect Identification of the Complex Poisson's Ratio in Fractional Viscoelasticity

Sousa

Silva

Pereira

2018

Lat. Am. j. solids struct.

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The use of viscoelastic materials (VEMs) has becoming more and more frequent both as vibration control in general or as parts of structural components. In all applications, the mechanical behavior of such materials can be predicted by the complex moduli (Young's, shear or volumetric) and the complex Poisson's ratio. Over recent decades, various methodologies have been presented aiming at characterizing complex moduli. On the other hand, the indirect identification of the Poisson's ratio, in the frequency domain, proves to be underexplored. The present paper discusses two computational methodologies in order to obtain, indirectly, the complex Poisson's ratio in linear and thermorheologically simple solid VEMs. The first of them uses a traditional methodology, which individually identifies the complex Young's and the shear moduli and, from them, one obtains the complex Poisson's ratio. The second methodologyproposed in the present paper and called 'integrated'-obtains the complex Poisson's ratio through a simultaneous identification of those two complex moduli. Both methodologies start from a set of experimental points of the complex moduli in the frequency domain, carried out at different temperatures. From those points, a hybrid optimization technique is applied (Genetic Algorithms and Non-Linear Programming) in order to obtain the parameters of the constitutive models for the VEM under analysis. For the experiments described here, the integrated methodology proves to be very promising and with a great application potential.

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Development of an image analysis technique for measurement of Poisson’s ratio for viscoelastic materials: application to leather

Cited by 9 publications

References 9 publications

Mechanical Parameters of Leather in Relation to Technological Processing of the Footwear Uppers

Mechanical Parameters of Leather in Relation to Technological Processing of the Footwear Uppers

2D model simulating the hydro-rheological behavior of leather during convective drying

Indirect Identification of the Complex Poisson's Ratio in Fractional Viscoelasticity

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