Analysis of the Single Bar Warp Knitted Structure Using an Energy Minimization Technique

Hart, K.; Jong, Seung-Keun; Postle, R.

doi:10.1177/004051758505500807

Cited by 25 publications

(10 citation statements)

References 8 publications

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“…where a ¼ 0:417; b ¼ 0:089 and k ¼ 0:256: The constants used in this equation have been chosen to give the correct moduli at 0 and PL 2 =B ¼ 5: All three constants are dependent on fabric parameters, as concluded by Williams and Leaf (1974). The measurement of fabric thickness t/L at almost constant d min , as performed experimentally, is equivalent to finding t/d min at a constant quarter-loop length L. There is only a small variation (less than 3 percent) in t/d min with changing fabric tightness d min /L (Hart, 1981). This small variation may not be detectable experimentally.…”

Section: Transverse Compression Of the Plain-knitted Structurementioning

confidence: 88%

“…If the ratio on the left-hand side of equation ( 1) is high relative to m, the interlacing yarns are likely to slip during fabric extension. In this way, it has been calculated (Hart, 1981) that the interlacing yarns are more likely to slip when the plain-knitted fabric is extended in the wale direction. Setting increases the ratio on the left-hand side, thereby facilitating yarn slippage during fabric extension.…”

Section: 3/4mentioning

confidence: 99%

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Structural mechanics of knitted fabrics for apparel and composite materials

Postle

2002

International Journal of Clothing Science and Technology

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The importance of fabric biaxial extension, in-plane compression, shear and bending properties, have been widely recognised by textile scientists and engineers for the evaluation of the three-dimensional formability and drape of textile materials in apparel products and threedimensional preforms. In contrast to woven fabrics where bending and shear properties determine the fabric formability, knitted fabrics have very high formability as a direct result of their easy biaxial extension properties. This ability to form three-dimensional shapes using the biaxial extensibility of knitted structures enables these knitted textile materials to be utilised for a wide variety of close fitting apparel garments and shaped composite preforms. Some representative biaxial extension curves for the plain knitted structure are described in this paper. These curves illustrate an unusual shape for the load-extension curve of a textile material arising from the pretension or pre-stress. The pre-stress yields an initial high tensile modulus for the structure in contrast to the very low initial modulus characteristic of apparel textiles. Accordingly, for knitted textile materials, it is shown how biaxial extension of the fabric introduces a fabric pre-stress to maximise the three-dimensional fabric formability especially when subjected to transverse compression by the resin or matrix in a composite material. Typical uniaxial and biaxial tensile stress-strain curves for knitted fabrics are compared.

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Section: Transverse Compression Of the Plain-knitted Structurementioning

confidence: 88%

Section: 3/4mentioning

confidence: 99%

Structural mechanics of knitted fabrics for apparel and composite materials

Postle

2002

International Journal of Clothing Science and Technology

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“…As the mesh is extended uniaxially, the jamming forces between neighboring loops increase in the direction normal to extension. In walewise extension, (i.e., extension in the warp direction), the width jamming yarns come closer together (Figure 14), thereby increasing the force between the interlacing yarns 32, 33. This, in turn, reduces the tendency for the interlacing yarns to slip.…”

Section: Discussionmentioning

confidence: 99%

“…Strain hardening is an undesirable property in the context of hernia meshes and indicates that the meshes will increase in stiffness over time. This decreases the flexibility of the implanted mesh; possibly relating to observed complications such as restriction in the abdominal wall mobility and long‐termed pain and discomfort 32, 41…”

Section: Discussionmentioning

confidence: 99%

Evaluation of dynamic creep properties of surgical mesh prostheses—Uniaxial fatigue

2009

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In this study, we examine the dynamic creep behavior of four commonly used commercial hernia meshes (Prolene, Ultrapro, Vypro, and Vypro II). The meshes, differing from each other with respect to composition and architecture, were tested under uniaxial tension at simulated physiological loads and environmental conditions. The changes in percentage strain elongation, secant modulus, and cyclic energy dissipation over 100,000 cycles were compared. All of the meshes evaluated were found to be overengineered compared to physiological-loading criteria and displayed good load-carrying performance. When all meshes were tested at 37 degrees C in physiological saline, they survived 100,000 cycles of sinusoidal loading without fracture, except Ultrapro. Interestingly, irrespective of the differences in structure and composition, all meshes underwent strain-hardening and permanent plastic deformation. Scanning electron micrographs of the meshes showed evidence of yarn thinning, decrimping, and fracture. The results of this study suggest that strain-hardening of the meshes under dynamic loading could be a possible cause for complications related to abdominal mobility during long-term implantations.

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“…In the area of the modelling of the yarn geometry of the warp knitted structures are existing several investigations and models [3][4][5][6][7][8][9], but the problem of the decomposition of one 3D profile into several parts and the generation of knitted program is very less investigated. In [10] are presented general consideration about the modelling of the loops in jacquard warp knitted fabrics.…”

Section: State Of the Artmentioning

confidence: 99%

About the automated pattern creation of 3D jacquard double needle bed warp knitted structures

Renkens¹,

Kyosev

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Synthesis of compact patterns for NMR relaxation decay in intelligent "electronic tongue" for analyzing heavy oil composition E M Lapshenkov, V Y Volkov and V P Kulagin Abstract. Three dimensional structures can be produced on jacquard warp knitting machines with double needle bed. This work presents theoretical considerations about the modelling and simulation of these structures. After that a method is described, how to obtain production parameters from the simulation data. The analysis demonstrates, that the automated pattern creation of 3D structures is not always possible and not all mathematical solutions of the problem can be knittable.

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Analysis of the Single Bar Warp Knitted Structure Using an Energy Minimization Technique

Cited by 25 publications

References 8 publications

Structural mechanics of knitted fabrics for apparel and composite materials

Structural mechanics of knitted fabrics for apparel and composite materials

Evaluation of dynamic creep properties of surgical mesh prostheses—Uniaxial fatigue

About the automated pattern creation of 3D jacquard double needle bed warp knitted structures

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