This paper presents a study of the electromagnetic shielding characterization of woven fabrics, produced with two different types of conductive yarns, namely silver-containing (Ag/PA/Co) core yarns and silver-containing (Ag/PA-Co) blended yarns. The effect of various yarn and fabric properties, such as yarn count, core filament count, blend ratio, weft density, electrical resistivity, yarn type and wave frequency, on the electromagnetic shielding effectiveness was investigated. The results have shown that the shielding effectiveness can be tailored by changing the yarn and fabric parameters and also there are significant differences between the electromagnetic shielding characteristics and performances of the fabrics produced with different yarn groups. Such fabrics are future promising for both daily and professional uses, since they combine high shielding effectiveness performance and the comfort properties of conventional fabrics.
Transport industry faces challenges steadily due to rising fuel costs and stricter regulations for the emission of air pollutants. Technological developments that reduce fuel consumption are necessary for sustainable and resource-efficient transport. Innovative production technologies utilising multi-material designs come to the fore in an attempt to fabricate lightweight products with extended functionality. Departing from this motivation, novel process chain concepts for the manufacturing of bi-material forged products are being researched at the Leibniz Universität Hannover in the context of the Collaborative Research Centre (CRC) 1153. The developed technology is referred as Tailored Forming and deals with the deformation and subsequent processing of joined hybrid workpieces to produce application-oriented products. Deformation processes are carried out at elevated temperatures for thermomechanical treatment of the joining zone properties. Researchers make use of numerical simulation in each step in the process chains. This paper explains the challenges associated with induction heating and impact extrusion of bi-material forging billets and presents our solution approaches with the aid of numerical modelling. Experimental validation results and analysis of deformed workpieces are also shown.
In this paper, a preliminary research was conducted to investigate some physical properties of PLA based meltblown nonwovens for agricultural applications. Air permeability, thickness, basis weight, biodegradability and fiber diameter properties of the samples were investigated. PLA based nonwovens that are suitable to be used without damaging the environment were obtained. Such bioplastic nonwovens can be used in various agricultural applications. The samples obtained in this research provided suitable air permeability, thickness and basis weight values for use in agricultural textiles, while being biologically degradable in ecological conditions in natural environments. Bioplastic meltblown nonwoven of 5.8-10.5 μm were obtained in this research. The results of the research presented in this paper will be used for the selection of a specific agricultural application and thus extensive research will be conducted for product development of the selected product type.
In this paper, a new method is proposed for the determination of Coulomb• ICA is found to depend only on the friction and the strain-hardening exponent.• A directly applicable procedure is developed to evaluate friction coefficients.• Associated digital image analysis-based source code is provided.
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