H. Nosraty, M. Kabganian and Ali A. A Jeddi,
Volume 19, Issue 2 (1-2001)
Abstract
Air-jet weaving is an advanced weaving method with high efficiency and productivity. It is one of the most widely used methods of weaving in the world. In air-jet filling insertion, the motion of weft yarn is caused by friction between weft yarn and air blown through nozzle. After declamping and subjecting the yarn to air stream, its motion is not active but very complicated and influenced by structural properties of yarn and air stream factors. Researchers have tried to obtain the yarn motion equations in order to analyze and simulate the air-jet weft insertion system. The results could then be used in the optimization of weaving operation and machine design. In the present work, a single-nozzle loom was simulated by obtaining the weft yarn motion equation. The position, the velocity and the weft yarn tension graphs were obtained by numerical soloution of weft yarn motion equation. This analysis provided useful information for controlling the weft yarn tension in air-jet loom.
M. Tehrani, H. Nosraty, A. Lorak,
Volume 38, Issue 3 (Journal of Advanced Materials-Fall 2019)
Abstract
Due to their sensitivity to impact-induced delamination, woven fabric reinforced polymer composites have limited practical applications. Hybridization of polymer composites has been proposed as a solution to this problem. In this study, the effects of fiber reinforcement type, hybridization method, plies stacking sequence and loading rate on mode I delamination behavior of pure basalt, pure nylon, inter-ply and intra-ply hybrid (basalt/nylon) composites were investigated. Composites were length during its propagation in composite samples was measured by mode I delamination test. The inter-laminar fracture toughness of composite specimens was calculated using modified double-cantilever beam theory and the results were compared by statistical methods. A 30 to 80% improvement in the critical fracture toughness of intra-ply hybrid composite compared to pure ones was recorded. Moreover, the delamination initiation load decreased significantly by increasing the loading rate.
