INTEGRATION OF MAGNETIC MATERIALS WITH ACTUATOR ROLE ON TEXTILE SUPPORTS

Magnetic textile materials represent a new category of smart materials, whose properties are obtained either by adding magnetic materials during the technological processes of obtaining fibres and yarns, either by applying some magnetic materials on textile surfaces during the chemical finishing processes (electroless plating, electroplating, magnetron sputtering). Therefore, by adding magnetic nano powders in the spinning solution, fibres with magnetic properties are obtained, by adding metallic fibres, with magnetic properties, during the spinning process, magnetic yarns are obtained, and by the insertion of a certain percent of metallic/magnetic yarns during the weaving or knitting process, textile materials with magnetic properties are obtained. Thus, magnetic textile materials will possess the uniqueness of a textile structure due to specific features as flexibility, breathability or lightweight, but at the same time, also the magnetic properties necessary in multiple applications such as magnetic sensors, actuators and electromagnetic shielding used in technical applications for defence, automotive and aerospace.

Evaluating the resistance of metal reinforced multi-layer textile structure against penetration of sharp objects

One of the common applications of textile protective structures is making barriers against penetration of sharp objects. Multilayer fabrics can absorb energy and are a proper candidate to be used in body armors. In this study, a three-layer textile structure which is reinforced by metal threads has been designed and produced. Metal reinforced layer was woven through a particular weaving system. Force and energy of penetration in each layer and also the three-layer textile structure was measured. The test results revealed that the layer resistance against penetration of sharp objects varied depending on the strucure of each layer. The metal reinforced layer had the highest penetration force and energy. In the three-layer textile structure, the resistance behavior of each layer was observed separately and stepwise. Thus, the force peaks in the three-layer textile structure were related to the peak forces in each layer, and the maximum penetration force of three-layer structure was similar to penetration force of metal-reinforced layer. When putting three layers on each other, the penetration energy has increased, and the designed multi-layer textile structure has performed efficiently in absorbing the penetration energy of sharp objects. Due to the stepwise resistance of three-layered textile structure, its obtained penetration energy, was divided into two energy values of external layer and both middle and inner layers. Thus, accumulation of penetration energy of single external, middle and inner layers was in good agreement with penetration energy of three-layer textile structure.

Numerical Analysis of Large Deflections of a Flat Textile Structure with Variable Bending Rigidity and Verification of Results Using Fem Simulation

The paper presents the numerical modeling of large deflections of a flat textile structure subjected to a constant force acting on the free end. It was assumed that the examined structure is inextensible. The effect of the structure's own weight was also taken into account. In order to solve the problem, the flat textile structure was modeled using the heavy elastica theory. An important element of the analysis involves taking into account the variable bending rigidity of the examined textile structure along its length, which is often found in this type of products. The function of variable bending rigidity was assumed in advance. Numerical calculations were carried out in the Mathematica environment using the shooting method for the boundary value problem. The obtained results were verified using the finite element method.