Damping Properties of Hybrid Composites Made from Carbon, Vectran, Aramid and Cellulose Fibers

Hybridization of carbon fiber composites can increase the material damping of composite parts. However, there is little research on a direct comparison of different fiber materials—particularly for carbon fiber intraply-hybrid composites. Hence, the mechanical- and damping properties of different carbon fiber intraply hybrids are analyzed in this paper. Quasi unidirectional fabrics made of carbon, aramid, Vectran and cellulose fibers are produced, and their mechanical properties are analyzed. The material tests show an increased material damping due to the use of Vectran and aramid fibers, with a simultaneous reduction in strength and stiffness.

Carbon-Based Fiber Materials as Implantable Depth Neural Electrodes

Implantable brain electrophysiology electrodes are valuable tools in both fundamental and applied neuroscience due to their ability to record neural activity with high spatiotemporal resolution from shallow and deep brain regions. Their use has been hindered, however, by the challenges in achieving chronically stable operations. Furthermore, implantable depth neural electrodes can only carry out limited data sampling within predefined anatomical regions, making it challenging to perform large-area brain mapping. Minimizing inflammatory responses and associated gliosis formation, and improving the durability and stability of the electrode insulation layers are critical to achieve long-term stable neural recording and stimulation. Combining electrophysiological measurements with simultaneous whole-brain imaging techniques, such as magnetic resonance imaging (MRI), provides a useful solution to alleviate the challenge in scalability of implantable depth electrodes. In recent years, various carbon-based materials have been used to fabricate flexible neural depth electrodes with reduced inflammatory responses and MRI-compatible electrodes, which allows structural and functional MRI mapping of the whole brain without obstructing any brain regions around the electrodes. Here, we conducted a systematic comparative evaluation on the electrochemical properties, mechanical properties, and MRI compatibility of different kinds of carbon-based fiber materials, including carbon nanotube fibers, graphene fibers, and carbon fibers. We also developed a strategy to improve the stability of the electrode insulation without sacrificing the flexibility of the implantable depth electrodes by sandwiching an inorganic barrier layer inside the polymer insulation film. These studies provide us with important insights into choosing the most suitable materials for next-generation implantable depth electrodes with unique capabilities for applications in both fundamental and translational neuroscience research.

Design and optimization of intelligent cleaning robot in chemical fiber textile workshop

From artificial turf to medical fibers, chemical fiber materials have become a new type of material, and chemical fiber textile materials have long gone beyond the scope of clothing. They play an important role in the fields of medical, clinical, chemical and other fields. The handling is not optimistic. Therefore, this article analyzes the working principle and process of the intelligent cleaning machine, and uses this as the theoretical basis to design the structure of the intelligent cleaning robot for the textile workshop, and then proceed from the functionality and aesthetics to its appearance design and optimization. A simple but distinctive appearance, while also greatly improving work efficiency.

Modeling of Surface Fracture in Friction Interaction of Fiber Composites

The model of the frictional interaction of a fiber composite material with a rigid non- wearing body is proposed, which makes it possible to study the effect of the mechanical and strength characteristics of the fiber and matrix materials and the composite structure on its stress state, in particular, at the fiber-matrix interface. Analysis of the stress distribution in the subsurface layers of the composite was carried out for different values of the ratio of matrix to fiber materials hardness, the sliding friction coefficient and the distance between the fibers. For the known failure criteria of fiber composites, the conclusions about the effect of the structure and relative strength properties of a fiber (fiber bundle) and matrix on the pattern of subsurface fracture of the composite under sliding friction conditions are made

SISTIM PERTANIAN TERPADU PETERNAKAN KAMBING DENGAN LIMBAH HASIL PRODUKSI KOPI DI DESA TRIBUDISYUKUR LAMPUNG BARAT

Coffee husk waste has not been used optimally from the by-product of coffee bean processing production (green bean) and there is no integrated farming system between agriculture and animal husbandry. The purpose of the PPPUD service is to utilize coffee skin waste as animal feed, (2) to design healthy goat cages to optimize livestock manure waste. The implementation method is the extension and demonstration method with the stages of initial implementation, implementation of activities, and final implementation. The result of the activity is the transfer of innovation in animal feed processing training by utilizing coffee skin waste and other fiber materials, as well as the concept of a goat drum with a waste disposal site that can be used for processing waste into compost so as to increase income.Limbah kulit kopi belum dimanfaatkan secara optimal dari hasil samping produksi pengolahan biji kopi (green bean) dan belum adanya sistim pertanian terpadu antara pertanian dan peternakan. Tujuan dari pengabdian PPPUD memanfaatkan limbah kulit kopi menjadi pakan ternak, (2) mendesain kandang kambing sehat untuk mengotpimalkan limbah kotoran ternak. Metode pelakasanaan dengan metode penyuluhan dan demontrasi cara dengan tahapan pelaksanaan awal, Pelaksanaan keiatan, dan Pelaksanaan akhir. Hasil deari kegiatan adalah transferinovasi pelatihan pengolahan pakan ternak dengan memanfaatkan limbah kulit kopi dan bahan serat lainnya, serta konsep kendang kambing dengan tempat pembuangan limbah dapat dimanfaatkan untuk pengolahan limbah menjadi pupuk kompos sehingga meningkatkan pendapatan.

The Use of Mathematical Modelling Methods in the Creation of Composite Materials Based on Carbon Fibre Materials

The report provides data on the electrochemical modification of carbon-graphite fibers as the basis for the creation of composite materials. The results of studies of the electrodeposition of metals on pre-electrochemically modified carbon fiber materials (CFM) in order to obtain composite materials based on them are presented. The use of CFM for the creation of composite materials is associated with the possibility of deposition of metals, alloys or their compounds on the surface of their constituent fibers. Electrochemical treatment in aqueous solutions of electrolytes is a promising method for modifying the surface properties of carbon materials, including in order to improve their adhesive properties. Preliminary electrochemical modification of carbon fiber materials in indifferent solutions of electrolytes made it possible to obtain composite and nanocomposite materials with good adhesion of the electrodeposited metal to the surface of the fibers of carbon materials.When metals are deposited on carbon fiber materials, it is necessary to solve the problem of applying a uniform metal deposit or with a certain profile in the thickness of the material. In this case, it is effective to use methods of mathematical modeling of metal deposition processes in a flowing three-dimensional electrode. Depending on the selected modes of deposition of metal sediment on the CFM, some electrochemical parameters of the process and system may be dependent on both the time of the process and the thickness coordinate of the electrode. This is especially true for the value of the resistivity of the solid phase of the system, that is, carbon-graphite fibrous material. Other electrochemical parameters, such as the specific electrode surface, the exchange current and the transfer coefficient of the electrochemical reaction, the porosity of the material, etc., can also change during the electrodeposition of the metal on the CFM. It is proposed to take into account the change in the characteristic properties of modified carbon fiber materials in the mathematical modeling of the processes of electrodeposition of metals on carbon fiber materials in order to determine the technological parameters to improve the efficiency of the properties of composite materials. In order to implement mathematical models used in the calculation of electrochemical processes in the volume and on the surface of carbon fiber materials, a set of programs based on modern computational methods and programming languages has been developed.

Design and Mechanical Properties of a New Clamp-Type Carbon Fiber Materials Tension Anchoring System

Carbon fiber materials are widely used in bridge reinforcement techniques, while conventional carbon fiber material tensile anchoring equipment produces a large prestressed loss. This paper analyzes the deficiencies of existing tensile anchoring systems at home and abroad, summarizing the cause of prestressed losses, and combining with existing anchoring systems, a new type of clamp type carbon fiber cloth tension anchoring system is proposed. The amount of deformation of the anchoring system is reduced by about 20%, which in turn reduces the system prestress loss caused by the system deformation. The ABAQUS finite element analysis software is used to numerically simulate the thickness of the tension anchor system and the force of the fixture at different inclination angles. Compare the experimental measurement data, under consideration of the mechanical properties of the system, making errors, and installation convenient prerequisites, the mechanical properties of the system are optimal when the thickness of the fixed plate is 30mm and the clamp tilt angle is 5 °.