标题：Development of a method for estimating the resistance of fibers and threads to a sliding bend based on energy consumption for external and internal friction
期刊名称：Eastern-European Journal of Enterprise Technologies
印刷版ISSN：1729-3774
电子版ISSN：1729-4061
出版年度：2018
卷号：6
期号：1
页码：80-87
DOI：10.15587/1729-4061.2018.148739
语种：English
出版社：PC Technology Center
摘要：We present materials for constructing an instrumental method for assessing resistance of threads to the sliding bend relative to cylindrical surfaces in order to solve tasks on control and prediction of conditions for their processing at minimal cost of production. Underlying the method is the differential accounting of energy consumed to overcome the internal and external friction.The main objective of this study was to improve informativeness of the results obtained in the analysis of fires and threads through manifestations of physical- mechanical properties predetermined by patterns in their structure and composition, as well as by characteristics of the streamlined surfaces. It has been proposed to test the thread based on the simulated actual conditions for frictional interaction when bending radius r of the working bodies’ edges should be commensurate with the thickness of the thread. Given such a variant of testing, we have identified conditions that ensure the manifestation of parameters for the internal and external friction, which made it possible to devise a technological scheme of tests and to conduct comparative analyses of threads in materials with different structure and properties.We have proposed, as an estimate that characterizes the manifestation of only the external friction at a cylindrical surface of curvature 1/r, the magnitude of energy Аext. consumed to displace a thread (of rigidity EI and with a stretched force) under condition 2T(r)2/El ≥ 1500. To account for the total energy A due to the external and internal friction, as an estimate that characterizes the resistance of a thread against a sliding bending, the test conditions imply the application of a bending surface with elevated curvature 1/r1, that is r1<
关键词：thread;rolling;sliding bend;thread-guiding gear;consumed energy;external and internal friction;control method
