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Fatigue life testing of the round link mining chains

Kandzia Ryszard, Szot Mariusz

Management Systems in Production Engineering

2023

nr 1 (31)

78--85

The material fatigue phenomenon consists of progressive material damage through the appearance and development of fractures under the influence of variable, periodically recurring stresses. Engineers designing machinery and structures to be fatigue resistant can gain useful insights about design and material properties by reviewing the literature. In this way, we can avoid costly research, but in the case of complex loading phenomena and the interaction of components, we must carry out such research. Fatigue strength calculations are less accurate than simple static calculations. The wear of link chains is concentrated in three areas, depending on the installation location and function of the individual links, namely: in the joints (the points of contact between two links), on the outer surfaces of the arches and on the outer surfaces of the straight sections of the links. During operation, chains are particularly vulnerable to wear through abrasion, corrosion and fatigue. These ageing factors, which act with varying intensity depending on the properties of the deposit, determine the service life of the chain, unless other unforeseen damage occurs, e.g. "hard" blockage of the chain. In many cases, users are guided by their own subjective criteria for assessing the technical condition of chains, which does not always lead to fully rational decisions regarding the continued use of used chains. To date, there have been no attempts to transfer the results of chain fatigue tests to behaviour of real objects. This paper presents issues related to mining chain fatigue testing. The test results presented are for both new and used chains. The experimental tests conducted at GIG made it possible to solve the problem of applying fatigue test results in industrial practice.

Verification of the magnetic method in testing of the modified composite core of overhead conductors

Szot Mariusz, Szade Piotr

Journal of Power Technologies

2020

Vol. 100, nr 2

138--143

ACCC/TW conductors deliver excellent electricity transmission results, boosting overall power system efficiency and capacity. Detracting from their many advantages is the propensity of their composite cores to suffer cracking under excessive bending. This article presents a concept for modifying construction and a testing method to determine the technical state of the conductor core after installation in its place of operation. The technique uses an existing method for magnetic testing of steel cables. Tests were conducted on a series of conductor model swith cores containing epoxy resin with an addition of a ferromagnetic FeSi 15 powder. The measurements showed the tests were able to detect small crosswise gaps and cracking simulated in the core. The accuracy of the method is determined by the concentration of a magnetic component in the core.