پديد آورنده :
رنجبران، مناعت
عنوان :
بررسي تغييرات شكلي پارچه هاي چند محوري حلقوي تاري تحت تاثير نيروهاي خارجي
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
تكنولوژي نساجي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده نساجي
صفحه شمار :
ده،94ص.: مصور،جدول،نمودار(رنگي)
يادداشت :
ص.ع. به فارسي و انگليسي
استاد مشاور :
محمد ذره بيني
توصيفگر ها :
تغيير شكل سه بعدي , تغيير زاويه , الياف شيشه , دستگاه برازش
تاريخ نمايه سازي :
28/2/93
استاد داور :
سهيد شيخ زاده، حسين حسني
چكيده انگليسي :
An Investigation into Deformation of Multi Axial Warp Knitted fabric Subjected to External forces Mena at Ranjbaran me ranjbaran@yahoo com Date of Submission 4 1 2014 Department of Textile Engineering Isfahan University of Technology Isfahan 8415683111 IranDegree MSc Language Farsisajeli@cc iut ac ir Supervisor Saeid AjeliAbstract Warp knitted fabrics are textile assemblies which are composed of straight crimp less yarns Unique characteristics of these fabrics such as their high formability are due to their specificinternal structure Formability of textiles in general is greatly affected by factors such as appliedstresses during forming process In this study three dimensional 3D deformation induced in warp knitted fabrics was evaluated Bi axial and tri axial samples of commercially available warp knitted fabrics constructed usingglass fiber yarns were obtained The samples were composed of 200 tex yarns in 45 directions however in tri axial samples the tex of yarn in z direction was 68 The constituent layers in thesamples were connected together using chain stitch Tensile properties of the samples weredetermined using ZWICK apparatus Behavior of the fabric during deformation is affected by yarninclination The flat samples were formed into creaseless 3D hemispheres using a purposelydesigned and fabricated device This device was successfully used to prepare 75 and 110 mm radii3D hemispherical creaseless experimental samples The prepared 3D samples were photographedusing an 18 megapixels camera A protractor was used to determine the changes in yarn inclinationin the 3D samples by measuring the distance from the center of hemisphere from a given point Also a geometrical model capable of predicting the change in inclination of each yarn in respect ofother yarns was developed Results pointed to existence of acceptable level of compatibilitybetween theoretical and measured data It was found that the compatibility between the modelgenerated results with those obtained by experiments is more profound in case of 110 mm radiisamples in comparison to 75 mm radii samples It was observed that resistance to deformation dueto applied external force in bi axial samples irrespective of direction is similar Additionally it wasfound that the resistance to deformation of tri axial samples in 0 direction is less than that in 45 directions It was concluded that the elastic modulus of tri axial fabrics is more than that of bi axial samples thus it was stated that resistance to deformation of bi axial samples is considerablyless than that of tri axial samples Key Words warp knitted fabric 3D deformation Forming glass fiber yarn inclination
استاد مشاور :
محمد ذره بيني
استاد داور :
سهيد شيخ زاده، حسين حسني
