Analysis of warp-knitted fabric structure. Part III: theoretical study on initial modulus of warp-knitted fabrics (reverse locknit,three- and four-needle sharkskin) |
| |
Authors: | H Dabiryan A Rastgoo |
| |
Affiliation: | 1. Department of Textile Engineering , Amirkabir University of Technology , Tehran , Iran;2. Department of Mechanical Engineering , Tehran University , Tehran , Iran |
| |
Abstract: | In the second part of this series, tensile properties of tricot structure were investigated. Then derived model was extended to locknit and satin as first group of fully thread two-needle bar warp-knitted fabrics. In the present study, tensile properties of second group of these warp-knitted fabrics, i.e. reverse locknit and three- and four-needle sharkskin, are considered using energy method and Castigliano’s theorem. For this purpose, the difference between the tensile properties of first and the second group of warp-knitted fabrics is attributed to the movement space and friction of back bar underlaps. Similar to previous part, free-body diagrams of elements are drawn to show the relative magnitude and direction of all forces acting upon an object in a given situation. Finally, the initial modulus of second group of warp-knitted fabrics is obtained. |
| |
Keywords: | reverse locknit three- and four-needle sharkskin initial modulus Castigliano’s theorem |
|
|