Finite element modeling of male leg and sportswear: contact pressure and clothing deformation

Lin, Yinglei; Choi, Ka Fai; Luximon, Ameersing; Yao, Lei; Hu, Jy; Li, Yun

doi:10.1177/0040517510395997

Cited by 22 publications

(8 citation statements)

References 18 publications

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“…Take an ideally elastic material satisfying Hooke’s law and let σnormalEnormal be the engineering stress and εnormalE be an engineering strain at any point in the straight line region of the stress–strain diagram. Then, Young’s modulus E is defined as the ratio of engineering stress to engineering strain 52–57 so we can write: …”

Section: Theoretical Investigation Of Compression Pressurementioning

confidence: 99%

“…), of elastic fabrics are analyzed using a stress-strain diagram, force-elongation curves as well as force-extension diagrams. There are various tensile testing machines that work on the principle of uniaxial directions includes Instron, Zwick and Testometric tensile testers, [12][13][14][15][16][17][18][19][20][21][22] which have been used by different researchers.…”

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confidence: 99%

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Development of new mathematical models and their comparison with existing models for the prediction of compression pressure using the cut-strip method

Siddique

Kůs

Militký

et al. 2022

Textile Research Journal

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Compression socks are a highly acclaimed textile garment for pressure exertion on the lower part of the leg (ankle). This part of the research explains the theoretical investigation of compression pressure by the modelization technique that helped to develop two new mathematical models by incorporating a few missing parameters for the measurement of compression pressure (kPa) and compared with existing models simultaneously. These new parameters including deformed width ( wf), true stress ( σT), logarithmic strain ( εT), true modulus (ET), and engineering stress ( σE)/strain ( εE)/modulus (EE) were incorporated and compared with Hook’s law ( k = fx) used for elastic materials at the ankle position. Various brands of compression socks composed of similar fibrous combinations as well as the knit type were purchased. Initially they were hand-washed, put on the leg for marking, a square was marked, circular cut-strips were detached from the ankle portion of the compression socks, and they were then cut to a linear shape for all 13 sock samples. For this, all linear cut-strips were installed on a Testometric tensile testing machine and were extended to a fixed elongation of 65% of gauge length five times simultaneously, and were then extracted for different extension (mm) values considering the requisite practical elongation values (circumferential difference between leg and socks at the ankle portion). The models developed were compared with Hook’s law and Laplace’s law. The developed models were compared with compression pressure values measured using existing models statistically.

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Section: Theoretical Investigation Of Compression Pressurementioning

confidence: 99%

mentioning

confidence: 99%

Development of new mathematical models and their comparison with existing models for the prediction of compression pressure using the cut-strip method

Siddique

Kůs

Militký

et al. 2022

Textile Research Journal

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“…At this juncture ADI developed model was imported to ANSYS workbench and flexible non-linear effects and strain effects were added to the model. The tetrahedrons element was chosen (Yinglei et al, 2011) and the element size was set as default and the minimum edge length was 0.39 mm. This element prevents volumetric locking by defining nodal volumes and evaluating average pressures in terms of volumes.…”

Section: Modeling and Meshingmentioning

confidence: 99%

“…The clothing deformation of a compression garment customized by simplified four-node tetrahedron finite elements. Linear elastic model was assisted for small displacements in garments (Yinglei et al, 2011). The above major studies proposed different methods to analyze the mechanical behavior of knitted fabrics using FEA.…”

Section: Introductionmentioning

confidence: 99%

Prediction of deformation behavior of single jersey cotton knitted fabrics using finite element method

Perumalsamy

Sakthivel

Anbumani

2014

International Journal of Clothing Science and Technology

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Purpose – The purpose of this paper is to elucidate the stress-strain relationships of single-jersey knitted fabrics from uniaxial tensile test followed by deformation behavior using finite element analysis. In order to elaborate the study, high, medium and low tightness knitted fabrics were selected and deformation of fabrics analyzed in course, wales and bias directions (0, 45 and 90 degrees). Design/methodology/approach – This study focussed on uni-axial tensile test of produced test samples using Instron 6021 tester and a development of single-jersey knitted loop model using Auto Desk Inventor software (ADI). The knitted fabric material properties and knitted loop model was imported to ANSYS 12.0 software. Findings – Due to structural changes the tightness and thickness of knitted fabric decreases with increase in loop length The tensile result shows maximum breaking strength at course direction (13.43 kg f/mm2 at 2.7 mm) and maximum extension at wales direction (165.77 kg f/mm2 at 3.3 mm). When the loop length increases, the elongation of fabrics increased and load carrying capacity of fabrics reduced. The Young's modulus, Poisson's ratio and shear modulus of fabrics reduced with increase in loop length. The deformation of fabrics increased with increase in loop length. The increase in loop length gives large amount of structural changes and it is due to slacking or jamming in loops and loosening in dimensions. When comparing the deformation results, the variation within the fabric is higher and structural damage little more when increasing the loop length of the fabric. Originality/value – From ANOVA test, stress and strain distribution was statistically significant among course, wales and bias directions at 95 percent confidence level. The values got from Instron test indicates that testing direction can alter its deformation. In deformation analysis, comparing both experimental and prediction, high amount of structural changes observed in wales direction. The used tetrahedral elements can be used for contact analysis with high accuracy. For non-linear problems, consistent approach was proposed which makes the sense to compare with experimental methods. The proposed model will make possible developments and the preliminary validation tests shows good agreement with experimental data.

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“…Human legs widely vary in shapes and sizes, resulting in that many leg mannequins are required for the evaluation of compression stockings, such as, dozens of leg manikins are presented in the Germany Standard of RAL-GZ387/1 [15]. To reduce the required leg mannequins, morphing leg mannequin [16,17] and finite element methods [18][19][20][21] have been developed. Finite element methods first construct models of human legs and the compression garment to mimic their mechanical properties, the shape and the size, and then simulate the amplitude and the distribution of the exerted pressure on the human leg [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Smart bionic morphing leg mannequin for pressure assessment of compression garment

Bao

Wang

Xiong

et al. 2020

Smart Mater. Struct.

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Compression garments, exerting appropriate pressure on the surface of needed body zones, have a wide application in medical, athletic, body-shaping, and healthcare fields. The exerted pressure, including the pressure amplitude and the special distribution, plays a significant role on the treatment efficacy. This paper presents a novel solution for pressure evaluation of precise pressure measurement of compression garments based on a smart bionic and morphing leg mannequin with 25 structured-fibre pressure sensors and 4 temperature sensing units. These pressure sensors with a high sensitivity (up to 54.7 pm kPa −1 with an accuracy of∼0.03 kPa) in the range from 0 to 10 kPa were embedded in the leg mannequin according to the German standard (RAL-GZ 387/1) and anatomical structures of ankles. Such sensor network can provide a precise pressure-mapping rather than a mean pressure obtained from other measurement systems. The fabricated leg mannequin can morph from size 23 (Size M) to 27 (Size L) with an accuracy of 0.125 mm in circumference, reducing the required leg mannequins in routine tests of manufacturing and medical applications. Furthermore, the measured pressure exerted on the fabricated mannequin was well consistent with those exerted on the human leg, showing nonuniform pressure distribution due to the apophysis and local buckles. Therefore, the characteristics of high sensitivity to low-pressure, pressure mapping, bionic, and morphing make the leg mannequins promising to be applied for routine tests in customization of compression garments.

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Finite element modeling of male leg and sportswear: contact pressure and clothing deformation

Cited by 22 publications

References 18 publications

Development of new mathematical models and their comparison with existing models for the prediction of compression pressure using the cut-strip method

Development of new mathematical models and their comparison with existing models for the prediction of compression pressure using the cut-strip method

Prediction of deformation behavior of single jersey cotton knitted fabrics using finite element method

Smart bionic morphing leg mannequin for pressure assessment of compression garment

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