ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 1 2021 01 01 Parameter Estimation of Viscoelastic Model to Simulate the Compression Behavior of Artificial Grass under Dynamic Loading Using Imperialist Competitive Algorithm Parameter Estimation of Viscoelastic Model to Simulate the Compression Behavior of Artificial Grass under Dynamic Loading Using Imperialist Competitive Algorithm 1 12 126730 EN Journal Article 2021 02 20 In this study, the parameters of linear Jeffrey’s model are estimated using imperialist competitive algorithm to simulate the compression behavior of artificial grass under dynamic loading. To this end, a viscoelastic model is used to explain this behavior according to ISO 2094. The model consists of a linear spring and a dashpot set parallel to each other. This combination is placed in series with a linear dashpot. The Fourier transform periodic excitation is converted to the summation of harmonic forces. Then, differential equations of the system motion are solved analytically. The result predicted for the compression behavior of artificial grass in dynamic loading is compared with the experimental results. According to the results, the average value of error for prediction of the compression behavior is 5.68%. Therefore, the linear Jeffreyʼs II model has a high ability to predict the compression behavior of artificial grass under dynamic loading. http://www.itast.ir/article_126730_85c22d787eb0808a80dcc0cb4cdf5e89.pdf

ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 1 2021 01 01 Study on Breast Shape Changing in Various Body Positions Using Depth Camera13 Study on Breast Shape Changing in Various Body Positions Using Depth Camera 13 26 126731 EN Journal Article 2021 02 20 In this research, 3D scan based on depth camera is used to measure, and analyze the breast shape changes in various body positions. 3D breast shapes of women are extracted from data obtained from a depth camera. A measurement method is developed based on cross section lines to get the 2D breast pattern. 3D breast shape and 2D breast patterns in five body positions are determined and compared to each other. To calculate the difference, 3D breast form and volume, also area and form of 2D breast pattern are measured. The results show that the breast form and volume in various body positions is not the same. Women have the highest volume and area of breast in the position ‘posture of 45 elbow-bend and arms to the back’ subsequent the position ‘posture of 45 elbow-bend and arms to the front’, ‘lower arm beside the body ‘ and ‘raise arm overhead and holding on the brow’, respectively. Also in the position ‘holding arm overhead’ the lowest volume of breast for women is observed. The difference of breast volume in the largest and smallest shape is about 23%. The combination of measuring breast volume and form at the same time can provide effective information for bra cup design. http://www.itast.ir/article_126731_0a36cc7cafe5e68b74fb4303922d75da.pdf

ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 1 2021 01 01 Modeling and Optimization of Colloidal Nanosilver Pretreatment on Acid-Free Dyeing, Antibacterial, and Hydrophilicity of Polyamide-6,6 Using Response Surface Methodology Modeling and Optimization of Colloidal Nanosilver Pretreatment on Acid-Free Dyeing, Antibacterial, and Hydrophilicity of Polyamide-6,6 Using Response Surface Methodology 27 40 126732 EN Journal Article 2021 02 20 Enhancement of dyeability, antibacterial, and hydrophilicity of polyamide-6,6 was introduced with colloidal silver nanoparticles (CSNs) and butane tetra carboxylic acid (BTCA) using cubic statistical models. Different concentrations of CSNs and BTCA were investigated to evaluate their influences on dyeability, antibacterial, hydrophilicity, and color change properties of polyamide-6,6 fabric by applying statistical design of D-optimal method. Antibacterial property of treated sample was tested by Gram-negative bacterium Escherichia coli and Gram-positive bacterium Staphylococcus aureus. To achieve optimum conditions for polyamide-6,6, response surface methodology was also utilized. Here, CSNs were stabilized on polyamide-6,6 surface using BTCA as crosslinking agent in order to enhance washing durability. Scanning electron microscopy and energy-dispersive spectroscopy were employed to characterize presence of CSNs on surface of polyamide-6,6 and elemental composition of treated polyamide-6,6 fabrics. Treatment optimization led to considerably absorption enhancement of C.I. Acid Red 81 dye through cubic statistical models on polyamide-6,6 surfaces as well as antibacterial and hydrophilicity characteristics and minimized color change caused due to CSNs influence. The principal result is synergetic effect utilizing BTCA accompany with CSNs on enhancing and durability of mentioned properties quantitatively in optimized conditions. Overall, the suggested method could be introduced as a new route, disclosing various desirable multifunctional characteristics to polyamide-6,6 fabric. http://www.itast.ir/article_126732_db2087780af39a6d74174b7c729af7cc.pdf

ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 1 2021 01 01 Effect of Seam Stabilizing Tapes on the Recovery Properties of Sewn Fabrics Effect of Seam Stabilizing Tapes on the Recovery Properties of Sewn Fabrics 41 50 126733 EN Journal Article 2021 02 20 Maintaining and improving the garment quality are the important topics in the textile and apparel industry. The aim of this paper is to investigate the influence of some textile tapes on elastic properties as well as dynamic recovery of the seams and enhance the shape stability. Three samples were prepared, namely weft knitted sewn fabrics without any stabilizing tape, and weft knitted sewn fabrics stabilized with bias woven fabric, and with stretch ribbons. The results show that hysteresis area of the seam tensile curves decreased by increasing the loading cycles, and dynamic work recovery stabilized after the third cycle. The tensile stress of all sewn samples in the course direction is significantly less than the stress value in the wale direction. It is found that the seams stabilized with stretch ribbons have the highest dynamic work recovery (~40-70%). Also, when the seam position and the loading direction aligned, the dynamic work recovery of the stabilized samples increased. The recovery behavior of the stabilized sewn fabrics was also simulated by mechanical models consisting of spring and dashpot elements. The threeelement model, consisting of the Maxwell body paralleled with a non-linear spring, properly estimated the force–strain curves of the stabilized sewn fabrics under cyclic loading. http://www.itast.ir/article_126733_e06e4518999b53193b06a8cf2ea44ae0.pdf

ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 1 2021 01 01 Effect of Brand Image and Interior Design of Sportswear Retailers on Loyalty: A Statistical Approach Effect of Brand Image and Interior Design of Sportswear Retailers on Loyalty: A Statistical Approach 51 64 126734 EN Journal Article 2021 02 20 This paper examines the impact of interior design and brand image on repurchasing and customer loyalty for sportswear products. In doing so, stratified sampling of target markets is considered for data gathering. In this respect, we apply C-means clustering technique regarding crucial attributes affecting customers’ market of sportswear. The data are collected using a self-administered questionnaire from respondents belonging to the resultant clustered market. We make the most of factor loads and t-test analysis to investigate the proposed conceptual model. Moreover, this study is performed by using SPSS to verify the reliability, and validity of the measured variables. Hypothesis tests are done utilizing structural equation model (SEM) as a statistical method. The results of this paper indicate the significant relations among interior design, brand image and customer loyalty. Finally, oneway and two-way analyses of variance (ANOVA) are conducted in order to clarify dependency of findings to demographical variables. http://www.itast.ir/article_126734_1faf0b44ac540cf7acdcb14be64913e6.pdf

ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 1 2021 01 01 Investigation on Physical and Mechanical Properties of Denim Woven Fabrics Made from Different Spandex Percentages Investigation on Physical and Mechanical Properties of Denim Woven Fabrics Made from Different Spandex Percentages 65 75 126735 EN Journal Article 2021 02 20 The main topic investigated in this paper is the analysis of the effect of different spandex percentages on physical and mechanical properties of the denim fabric. The results showed that percentage of elastane has a significant effect on the physical and mechanical properties of cotton/ elastane woven denim fabric. The influence of various elastane percentages via the above denim fabric performance parameters is investigated by employing a one-way analysis of variance (ANOVA) statistical software package. Tensile strength of denim fabric decreases as the percentage of the elastane increases because of the lower tenacity of spandex fibers compared to cotton fibers. Fabric breaking elongation increases as spandex percentage increases. The tear strength of denim fabric decreases as elastane percentage increases. As spandex percentage increased, the fabric contraction of the woven fabric increased, which made the fabric more compact and bulk, resulting in higher fabric thickness, fabric weight, and deep shade color. In addition, fabric stretchability and fabric elastic recovery increase with spandex percentage since elastane has higher stretch and makes the structure more compact, but fabric growth decreases as spandex percentage increases, due to the rather high recovery properties of spandex. The obtained results showed that Lycra proportion inside fabric has an effect on the fabric tensile strength, breaking extension, tear strength, stretchability, fabric thickness, GSM, and fabric shade color. http://www.itast.ir/article_126735_f088f3bceb9b9a61ed624105f9fa9af8.pdf