Authors: B.L. Gericke, S.A. Shvydkin

Title of the article: Assessment of survivability of bearing elements of metal structures of mine dump trucks

Year: 2024, Issue: 5, Pages: 12-24

Branch of knowledge: 2.8.8. Geotechnology, Mining machines (engineering)

Index UDK: 629.353

DOI: 10.26730/1816-4528-2024-5-12-24

Abstract: In the process of operation of dump trucks under the influence of dynamic loads defects are formed in metal structures, which further develop by fatigue type. The presence of defects leads to the need to assess the survivability of steel structures, i.e. the ability of dump truck structures to fulfill their functions despite damage. Modern assessments of survivability are mainly reduced to the definition of criteria characterizing the transition from stable development of a defect to its critical stage, i.e. to sudden destruction. Traditionally, survivability criteria are developed as a result of laboratory mechanical tests of samples, as well as industrial tests, in which the influence of various operational factors on the rate of defect development is investigated and critical defect sizes are determined. The survivability criteria obtained as a result of these studies are rather difficult to apply in real production conditions, because it is possible to obtain information on the size of defects and assess the dynamics of their growth only after visual inspection, which is carried out quite rarely. Therefore, we propose to use acoustic emission (AE) method of control to improve the quality of life assessment of metal structures of dump trucks. Development of survivability criteria on the basis of AE method is more effective way, because it allows to automatically apply survivability criteria directly in real production conditions. The AE method makes it possible, firstly, to indirectly judge about changes in the rate of defect development by changes in the intensity of AE signals emitted by the defect during its growth, and secondly, in case of a sharp increase in the intensity of AE signals, to speak about reaching the critical size of the defect, after which it is possible to destroy the element. The article presents the results of application of the AE method to assess the survivability of the dump truck frame section and presents information about the defects detected as a result of diagnostics. In addition, the necessity of determining the technical condition of metal structures of dump trucks with the help of permanent AE monitoring, which allows to carry out diagnostics during the direct operation of the dump truck in the quarry, as well as to automate the process of diagnostics, is substantiated. As a result of application of the AE method, the survivability criteria were established on one of the load-bearing elements of metal structures of dump trucks.

Key words: survivability acoustic emission monitoring technical condition diagnostics dump truck frame

Receiving date: 11.10.2024

Approval date: 15.11.2024

Publication date: 11.12.2024

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