Modelling and Simulation of Compression Behaviour of 3D Woven Hollow Composite Structures Using FEM Analysis

Three-dimensional (3D) woven spacer composites have the advantage of being lightweight and strong for use in various segments of structural engineering and automobiles due to their superior mechanical properties than conventional counterparts. In this investigation, the influence of different cell geometries of 3D woven spacer fabrics, namely rectangular, triangular and trapezoidal with woven cross-links, upon their mechanical behaviors, especially compression energy, was studied through FEM (finite element method). Cell geometries were changed into different heights and widths and evaluated through simulation and experiments. Simulation of the structure was carried out by the Abaqus platform, and validation of the results was done for the rectangular structure. It was found that compression energy increases with an increment in width, while initially, it shows the tendency to increase and subsequently decrease with an increment in height for the rectangular structure. Compression energy increases with an increase in the angle of the triangular structure; however, it shows the opposite trend in the case of the trapezoidal structure. The outcome of the result shows good agreement between simulation and experimentation values of more than 94% accuracy

Modulation of cross-sectional structure of air-vortex yarn through process variables

127-136Influence of process parameters on structural mechanics of air-vortex polyester cotton (65/35) blended yarn has been studied. Box-Behnken three variables design is used to optimize the spindle diameter, nozzle pressure and yarn delivery speed to achieve the required packing density of air vortex yarn. Image processing technique is used to measure the fibre area in different concentric zones. The study confirms that the yarn packing density and radial packing density of yarns are influenced by individual as well as interaction effect of process parameters. The packing density is not found to be maximum near the yarn axis. It is depicted that packing density of core, intermediate and surface zones of the yarn shows an increase with the increase in nozzle pressure, and decrease with the increase in spindle diameter and yarn delivery speed. The packing density of ring-spun yarn is found to be higher than vortex yarns with distinctly higher packing in the core- zone of the yarn

Properties of air-vortex blended yarn influenced by spinning process parameters

Box-Behnken three variables three factors design has been used to optimize the machine spindle diameter, nozzle pressure and yarn delivery speed for achieving the required quality of air vortex polyester/cotton blended yarn. The response surface equations for respective yarn properties in terms of coded factors and significant model terms are developed. Yarn tenacity and elongation show an increase with the increase in nozzle pressure and a decrease with an increase in delivery speed and spindle diameter. Yarn thin places, thick places, neps, U% and hairiness index depict an increase with the increase in delivery speed and spindle diameter, while the decrease is observed with an increase in nozzle pressure. A combination of 1.1mm spindle diameter, 0.5 MPa nozzle pressure and 432.38 m/min delivery speed is the optimized value for targeted yarn quality at 0.71 desirability value.

Properties of air-vortex blended yarn influenced by spinning process parameters

225-240Box-Behnken three variables three factors design has been used to optimize the machine spindle diameter, nozzle pressure and yarn delivery speed for achieving the required quality of air vortex polyester/cotton blended yarn. The response surface equations for respective yarn properties in terms of coded factors and significant model terms are developed. Yarn tenacity and elongation show an increase with the increase in nozzle pressure and a decrease with an increase in delivery speed and spindle diameter. Yarn thin places, thick places, neps, U% and hairiness index depict an increase with the increase in delivery speed and spindle diameter, while the decrease is observed with an increase in nozzle pressure. A combination of 1.1mm spindle diameter, 0.5 MPa nozzle pressure and 432.38 m/min delivery speed is the optimized value for targeted yarn quality at 0.71 desirability value

Modulation of cross-sectional structure of air-vortex yarn through process variables

Influence of process parameters on structural mechanics of air-vortex polyester cotton (65/35) blended yarn has been studied. Box-Behnken three variables design is used to optimize the spindle diameter, nozzle pressure and yarn delivery speed to achieve the required packing density of air vortex yarn. Image processing technique is used to measure the fibre area in different concentric zones. The study confirms that the yarn packing density and radial packing density of yarns are influenced by individual as well as interaction effect of process parameters. The packing density is not found to be maximum near the yarn axis. It is depicted that packing density of core, intermediate and surface zones of the yarn shows an increase with the increase in nozzle pressure, and decrease with the increase in spindle diameter and yarn delivery speed. The packing density of ring-spun yarn is found to be higher than vortex yarns with distinctly higher packing in the core- zone of the yarn.