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Self-Healing Structural Properties of Thermoplastics in HF Field
Engineering Education # 06, June 2014
DOI: 10.7463/0614.0713624
The last decades are characterized by growing production of polymer materials and using their products in all industries. Despite the declared warranty service, a number of products from polyamide materials are rejected in the course of their operation before a baseline period normalized by the manufacturer expires. Therefore, one of the possible ways for safe operation of polymer products is their self-healing. This is especially true for products from polymer materials exploited in hard-to-reach areas and machine and mechanism units. In this regard, the aim of this study was to develop an algorithm that enables the self-regeneration of the mechanical properties of polymer materials. To achieve this goal, the authors identified the following problems: defining the methods to provide self-healing of polymer materials, reasoning the possibility to detect damage in products from polymer materials, creating the algorithm to form a signal initiating the recovery process, defining the efficiency to regenerate the material. The paper discusses the problems of determining the conditions for the self-healing of polymer material structure. For finding the ways to determine the fatigue failures, methods of their determination proposed and developed by authors are used taking into account the real-meteorological and climatic operation conditions by the example of the products of the rolling stock of Russian Railways JSC. Using the samples of glass-nylon composite the necessary and sufficient indicators to determine the strength characteristics of the studied materials are found. The algorithm of self-healing is developed and experimental ratios to characterize a recovery of polymer materials are obtained.
High-Frequency Electro-Thermal Processing of Secondary Non-Metallic Raw Materials
Engineering Education # 06, June 2014
DOI: 10.7463/0614.0712029
The article aims to give a physical representation of the electro-thermal equipment operation to enhance its application capabilities in recycling the secondary raw material and describes a number of electrothermics technology applications in this area. The article presents a comparative analysis of the results of the high-frequency and microwave heating. As an example of wastes recycling of the forestry and woodworking industry, is shown an efficient use of high-frequency equipment in the technological processes of drying. The article offers the technological tooling developed by authors for forming the fuel briquettes. This technological equipment allows the use of thermo-mechanical method of their drying. The article describes experimental research results of waste processing of oil-petrol-resistant flexible PVC, cooking fuel briquettes, and facing materials from sawdust, which use a modifying additive as a crumb from the polyethylene waste, thereby increasing the durability of fuel briquettes, warmth, and stability of its combustion. Results of done work have shown the prospects for using the RF power to process the wastes of wood, plastic, and oil-petrol-resistant PVC.
 
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