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Jaouachi B.,Textile Research Unit of ISET Ksar Hellal | Louati H.,University of Monastir | Hellali H.,Textile Research Unit of ISET Ksar Hellal
Autex Research Journal | Year: 2010

In this research, fuzzy modelling and neural network methods were used and compared to predict the residual bagging bend height of knitting fabric samples. Studies undertaken to minimize the bagging phenomenon vary significantly with the test conditions including the experimental field of interest, the input parameters and the applied method. Hence, we attempt to formulate a theoretical model of predicting bagging behaviour in our experimental design of interest. By analysing the bend height of overall bagging samples, this paper provides an effective neural network model to evaluate and predict the residual bagging bend height of the knitting specimens after test. It also provides the impact of each input parameter in our experimental field of interest to simulate this phenomenon after use. Moreover, the contribution of these influential input parameters was analysed and discussed. Nevertheless, our results show that residual bagging height decreases when yarn contains elastane filament, Spandex©. This finding is in agreement with Mirostawa et al. [11] that with an increase of the elastane content in fabric, permanent bagging decreases, whereas elastic bagging increases. According to the analytical results obtained, the neural network model gives a more accurate prediction than the fuzzy one. © AUTEX. Source


El Abed B.,Textile Research Unit of ISET Ksar Hellal | Msahli S.,Textile Research Unit of ISET Ksar Hellal | Bel Hadj Salah H.,Mechanical Engineering Laboratory of ENIM | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2011

The paper presents the shear frame test with a new method of gripping the fabric sample to describe the shear behaviour of fabrics used in the garment industry under high shear strain conditions (maximum shear angles of 20°). This shear frame test was also used to compare between hysteresis curves given by the Kawabata evaluation system (KES) test, the bias extension test and the shear frame test for 10 woven fabrics. The linear viscoelastic theory was used to analyse the shear relaxation behaviour of the woven fabrics. In addition, in this study, the kernel function of the generalised Maxwell model has been used to describe the viscoelastic properties of the fabrics. © 2011 The Textile Institute. Source


Boubaker J.,University of Monastir | Boubaker J.,Textile Research Unit of ISET Ksar Hellal | Ben Hassen M.,Textile Research Unit of ISET Ksar Hellal | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2012

In order to evaluate the abrasion effect on both spliced and parent yarn performances, a newly developed abrader tester simulating the real cumulative weaving stresses is used. Three weaving parameters: loom speed, splice positions during weaving and yarn tension are tested to simulate the mechanical behaviour of spliced and parent thread yarns. The results show that the spliced yarn's abrasion resistance, expressed by lifetime cycle numbers, is more affected by the weaving parameters used in our developed abrader simulator tester than by others. In this work, the results obtained by our simulator abrader tester and the cyclical tensioning ones are compared to regression analysis models. According to the highest coefficients of determination ranging from 0.955 to 0.999, it is found that a good prediction of spliced and parent yarn breakages is possible. Comparing two interesting splice positions on the loom: the splice beat-up position and the splice shedding one, we conclude that the splice shedding position increases breakage rate. © 2012 Copyright The Textile Institute. Source


Jedda H.,Textile Research Unit of ISET Ksar Hellal | Ben Abessalem S.,Textile Research Unit of ISET Ksar Hellal | Ben Abessalem S.,University of Monastir | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2011

In this study, artificial anterior cruciate ligaments (ACLs) were manufactured using braiding and knitting processes. These artificial ligaments were designed to match the mechanical requirements of a native human ACL, including the fatigue performance. The effect of cyclic loading on the mechanical performance of the artificial ligaments was studied at different deformation rates (slow: 2% per second, medium: 50% per second and fast: 100% per second). The primary results showed that the deformation rate had no significant effect on the ultimate tensile strength, strain or stiffness. Single tensile loading to failure performed for each prosthesis before and after cyclic loading allowed the determination of its effect on the mechanical performance of the artificial ligaments. The increase in the number of cycles decreased the maximum strain and the ultimate tensile strength but had no significant effect on the stiffness. At 60,000th cycle, the braided prosthesis presented a better performance with a lower residual deformation compared with the knitted prosthesis. © 2011 The Textile Institute. Source


Mokhtar S.,Textile Research Unit of ISET Ksar Hellal | Mokhtar S.,University of Monastir | Ben Abdessalem S.,Textile Research Unit of ISET Ksar Hellal | Sakli F.,Textile Research Unit of ISET Ksar Hellal
Journal of the Textile Institute | Year: 2010

This paper investigates and reports the effect of some textile parameters (yarn and fabric parameters) on the main performances of plain woven vascular prostheses in order to enhance their overall quality. We weaved tubular structures with different fabric densities using texturized Dacron® polyester filament yarns with different linear densities and filament counts, in warp and weft directions. The performances of the manufactured samples, such as wall porosity, water permeability and mechanical features, have been tested. By adopting a two-level fractional factorial design of experiments, the responses were fitted to predictive models using a multiple linear regression method. The models were tested by variance analysis and validated by correlation between measured and predicted values. We determined the optimum settings of main textile parameters enhancing plain woven vascular prosthesis quality by contour plots method. © 2010 The Textile Institute. Source

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