ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 2 2021 06 01 Experimental Study on the Bending Behavior of 3D Woven Glass Fiber Sandwich Composite Panels بررسی تجربی رفتار خمشی کامپوزیت های پلیمری ساندویچی تقویت شده با پارچه سه بعدی بافته شده با الیاف شیشه 3 14 131321 EN Abolfazl Midrehghan AUT Hooshang Nosraty AUT Mahmood M Shokrieh Composites Research Laboratory, Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering, Iran University of Science and Technology Mehdi Akhbari Textile Engineering Department, Kashan Branch, Islamic Azad University, Kashan, Iran Journal Article 2021 06 01 Three-dimensional integrated woven sandwich composites (IWSCs) consist of two woven fabric faces and an integrated hollow core. The two parallel faces are bonded using pile yarns which keep a defined distance between the top and bottom. In order to characterize the mechanical properties, three-point bending test was performed on the IWSC sandwich composites. The results showed that by increasing the thickness of the composite and therefore increasing the moment of inertia, the flexural strength of the specimens increases. The average amount of bending force increase by increasing the thickness for different samples is equal to 80% to 120%. Also, by increasing the pile density, the flexural strength in hybrid and non-hybrid specimens increases. Therefore, the maximum flexural load is obtained from the composites with the highest thickness and pile density. On the other hand, due to the different arrangement of piles in the warp and weft directions, IWSC panels show different behavior in these two directions. The values of flexural strength in the direction of the warp are higher than the direction of the weft due to the higher density of pile yarns and therefore the higher shear strength of the structure in this direction. In different composites, this difference is 75% to 90%. The fracture properties of the composite under bending load show that due to the high strength and modulus of the face-sheets compared to the core section, the piles are more deformed and damaged and the face-sheets are not noticeably damaged. Also, the damage to the top face sheets of samples tested in the weft direction is greater than that of warp direction. http://www.itast.ir/article_131321_41bb8974c66fc84d4728926ccf85ca20.pdf

ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 2 2021 06 01 Reinforcing Concrete Columns with Winding Technique Using Weft Knitted Structure تقویت ستون های بتنی با روش دورپیچی با استفاده از پارچه حلقوی پودی 15 25 131323 EN Nastaran Hemmatinezhad AUT Ali-Asghar Asgharian Jeddi AUT Hossein Molavi AUT Journal Article Reinforcement of civil structures that do not have sufficient resistance to the applied loads is of particular importance. There are several ways to reinforce concrete structures so far. One of these methods is to use winding technique on a concrete structure with a fabric. In this study, first, rib knitted structures with and without weft inserted yarn were fabricated with two types of ordinary and high tenacity polyester yarn (with a low and high modulus). Then concrete columns were made and winded using produced fabrics with and without tension. The compression test was carried out on the winded columns. The results show that with increasing tensile modulus of the fabric (such as weft inserted rib fabric with high tenacity polyester yarn) the compressive strength of the concrete columns increases. Accordingly, while the sample had only 7.52% weight increase and 8.75% increase in diameter compared to the control sample, the bearing capacity of the column showed an increase of 88.55% compared to the control sample. Also, the compressive strength of concrete column is increased by increasing the number of layers winded around the concrete column. http://www.itast.ir/article_131323_fea7ab8c1b7893af9c117fa80b5035aa.pdf

ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 2 2021 06 01 Effect of Apparel In-store Merchandise Displays in Men’s Stores on Customer Behavior: A Case Study of Tehran City اثر عوامل محیطی بر رفتار مشتری در فروشگاه های پوشاک مردانه: مطالعه موردی در شهر تهران 27 42 131324 EN Reza Ghasemy Yaghin AUT Kimia Khalajmehri AUT Amoon Ali Daee AUT Journal Article 2021 06 01 Usually, the in-store design, lighting, color schemes, and other interior atmosphere could directly affect the purchasing behavior and loyalty regarding retailing stores. The overall purpose of this work is to investigate these factors on customers return and interest and to study the effects of in-store factors on the fashion retailer’s purchase intention in Tehran city. For this purpose, a sample of consumers from 22 regions of Tehran city was taken, who usually visited these stores. Data were collected through a well-structured questionnaire and analyzed through confirmatory factor analysis. After designing the statistical hypotheses, they were tested. Our findings indicate that there is a direct relationship between salesforce and lighting on customer return. In addition, specious stores could stimulate the customers to spend significant amount of time in apparel retailing stores. Finally, the statistical significance of the results in the clusters was evaluated by analysis of variance (ANOVA) tests. http://www.itast.ir/article_131324_14e7593e7101b934b13675ba2bbbddd2.pdf

ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 2 2021 06 01 Modeling and Optimization of Mass and Spring Based Vibration String Using Modal Analysis and Imperialist Competition Optimization Algorithm Methods مدل سازی و بهینه سازی رشته مرتعش مبتنی بر جرم و فنر با استفاده از روش های تحلیل مودال و الگوریتم بهینه سازی رقابت استعماری 43 56 131325 EN Mina Emadi 1. Textile Engineering Department, Faculty of Engineering, Yazd University, Yazd, Iran Pedram Peyvandy yazd Mohammad Ali Tavanaie Center of Excellence for Machine Vision in Textile and Apparel Industry, Yazd University, Yazd, Iran Mohammad Mahdi Jalili Mechanical Engineering Department, Yazd University, Yazd, Iran Journal Article 2021 06 01 Simulating the mechanical behavior of filaments is of interest in many fields, such as designing a method for quality control of filaments in textile engineering. Various methods have been proposed to simulate a string structure. The mass, spring, and damper model is a conventional physics-based method that has attracted the attention of many researchers due to its rapid simulation and greater accuracy. The purpose of this paper is to present a physical model to simulate the vibrational behavior of a monofilament. This model, which is based on mass and stiffness matrices, plays an essential role in sensitivity analysis and predicting dynamic behavior. First, a system for a realistic simulation of the transverse vibration of the string is presented using a mass, spring and damper model. Then, the model parameters are determined using modal analysis and imperialist competitive algorithm. The vibration of the string was recorded at all points with a high-speed camera, and video processing is done to extract the free decays. Finally, the monofilaments are simulated and compared with their actual results to confirm the model parameters. The results show that the optimized model has the ability to predict the vibrational behavior of monofilaments with an error of less than 12.3%. According to the error values, it can be stated that the results of the modal analysis were more accurate. http://www.itast.ir/article_131325_babd5cdf2da7a8d543290a3e5bc26fee.pdf

ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 2 2021 06 01 Relationship Between the Comfort Properties of Sport Wear and the Comfort Sensation of Athlete During Activity ارزیابی ارتباط خواص راحتی پوشاک ورزشی با احساس راحتی ورزشکار در حال فعالیت 70 57 131326 EN Mostafa Jafari Textile Engineering Department, Amirkabir University of Technology, Tehran, Iran Fatemeh Mousazadegan Textile Engineering Department, Amirkabir University of Technology, Tehran, Iran Journal Article 2021 06 01 In this study the relation of physical properties of fabric and the comfort feeling of athlete during physical activity is considered. To this end, four single-jersey weft knitted fabrics with various fibers blends were used to prepare sport T-shirts and then athletic comfort during wearing T-shirt and exercising in duration of 60 minutes was investigated, both subjectively and objectively. Furthermore, physical properties of applied fabrics including air permeability, water vapor permeability and thermal insulation properties were measured. Then, the relation of fabric characteristics and athletics comfort during activity was probed. Outcomes confirm that the increase in the body activity leads to the increment of the body temperature and sweating rate. Since cotton fiber absorbs and retains moisture, it keeps the skin wet during high activity level due to the high rate of sweating. On the other hand, polyester fibers owing to the high wicking ability and quick transfer of the moisture vapor to the environment, have better performance. Polyester fabrics with lower stitch density and loose structure have effective performance in terms of both dissipating extra body heat and moisture vapor to the surrounding and providing athletics comfort. The selection of proper sport wear is necessary since the level of physical activity affects the body heat and sweating rate. http://www.itast.ir/article_131326_8b886a5c6d6c17b40bcf17f556616561.pdf

ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 2 2021 06 01 Development of Resizing Software for Paper Patterns توسعه نرم افزار تغییر اندازه برای الگوهای کاغذی 80 71 131327 EN Maliheh Dehghan Morteza Vadood Pedram Payvandy Mehdi Rezaeian Journal Article 2021 06 01 Today, with the advancement of technology and practical tools, the use of manual methods has become inefficient due to time consuming. The keys to success in clothing production are the correct use of modern tools, new methods of design and production management. In the present study, an attempt was made to provide a fast and accurate method for converting a paper pattern to a modifiable and sizable digital pattern using image processing that is easily accessible and is not required special knowledge. In addition, different types of patterns including female upper body pattern, collar and collar hem, sleeves and pants were prepared. In order to express the results, six levels are considered for the average error obtained from sizing, which are high level (error less than 0.1 cm), relatively high (error between 0.1 cm to 0.4 cm), medium (error between 0.4 cm to 0.6 cm), relatively medium (error between 0.6 cm to 0.8 cm), relatively low (error between 0.8 to 1 cm) and low (error greater than 1 cm). After sizing and evaluating the measured errors, it was concluded that the average total errors in the proposed method to increase and decrease the sizes are 0.33 and 0.266 cm, respectively. http://www.itast.ir/article_131327_39be2150563c0e013867a422b1f74b5c.pdf