7393

6899

كارشناسي ارشد

تكنولوژي نساجي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده نساجي

1391

ده، 12۱ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محمد شيخ زاده، سعيد آجلي

26/9/91

محمد ذره بيني، حسين حسني

1396/09/21

كتابنامه

نساجي

مهندسي نساجي

ID6899

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Investigation into Mechanical Behavior of Braiding and Weaving Tubular Structures with using Thin Walled Cylindrical Model in Small Strains Jalil Hajrasouliha j hajrasouliha@tx iut ac ir Date of Submission 07 23 2012 Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors Dr M Sheikhzadeh m sh110@cc iut ac irDr S Ajeli Sajeli@cc iut ac irAbstractThe tubular fabrics are one of the most applicable fabrics in different industries especially in aerospace marine petrochemical and automotive industries Tubular fabrics can increase the mechanicalproperties of the final product either directly or as a reinforcing phase of the composites Producinglightweight thin walled vessels with high resistance against internal pressures and high flexibility isamong the many applications of the tubular fabrics Among the existing systems the braiding andweaving are of significant importance for producing tubular structures which are used as thin walledvessels The braid angle in braiding and the density of weft and warp in weaving are the most importantvariables which should be investigated precisely and be improved for the construction of a thin walledvessel under the internal pressure This study investigates these two parameters in an experimental method and compares the obtainedresults with the theory of the thin walled pressurized vessels and shells strengthened and improved byfibers A thin walled silicon pipe was used as the core for conducting the experiments Meanwhile frombraiding with 7 different braid angles and weaving with 5 different weft densities were used for thecovering of this thin walled pipe After this stage a structure was designed to test the internal pressureand the samples were placed on it The diameter started to increase in a fixed rate due to the increase ininternal pressure The behaviors of the samples up to the failure point were recorded by a digitalcamera The pressure diameter diagram was drawn and investigated for braid and weaving samples Inbraid samples it was observed that the diameter pressure diagram in the angle of 55 was linear and inthis angle all the forces created on the surface of the thin walled vessel are along the braid strands Inweaving samples also it was revealed that through increasing the weft density up to a certain amountthe fiber involvement would also increase and as a result the failure pressure increase as compared tothe weight of the used weft yarn would happen Following that due to increasing the shear forces in thesurface of the fabric the decrease in the failure pressure as compared to the weight of the used weftyarn would happen Finally the accuracy of the obtained results was investigated according to the thin walled vessels theory Keywords Braiding Weaving Braid angle Thin walled vessels Internal pressure Wrinkling moment

محمد شيخ زاده، سعيد آجلي

محمد ذره بيني، حسين حسني