PSI - Issue 59

Mykola Holotiuk et al. / Procedia Structural Integrity 59 (2024) 531–537 Holotiuk et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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2. Experimental research methodology Laboratory equipment (see Fig.1) was used to carry out experimental studies with a set of replaceable destructive elements with different sharpening angles and destructive elements with a flat knife of rectangular cross-section at the top (see Fig.2a,b). Ice blocks with a thickness of H = 20; 40; 60; 80; 100 mm were used for the study.

Fig. 1. Diagram of a laboratory installation for studying the parameters of a wedge-shaped destructive element: 1 – basement; 2 – bolts; 3 – traverse 4 – hydraulic cylinder; 5 – rod; 6 – pipelines; 7 – pumping station; 8 – pressure gauge; 9 – micrometer; 10 – fluoroplastic clip; 11 – sleeve; 12 – asphalt concrete; 13 – cover; 14 – lock nut; 15 – wedge-shaped destructive element; 16 – shank; 17 – ice; 18 – press support.

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Fig. 2. Photo of destructive elements: (a) general view of the studied models of wedge-shaped destructive elements: 1 - 2α = 10°; 2 - 2α = 20°; 3 - 2α = 30°; (b) wedge-shaped destructive element with a flat knife of rectangular cross-section at the apex. The ice mass was exposed to destructive elements that transmitted the shock impulse created by the impactor. The total stress pulse was recorded ( ) f    . The unknown value of the reflected impulse was determined as the result of the algebraic addition of the resultant and incident impulses. While maintaining the impact parameters of previous experiments, rubber was placed under the end of the tool. The resulting record was shifted in time with the total impulse, after which they were algebraically added. Consequently, we obtained the unknown reflected impulse acting on the ice during its destruction. The resulting oscillogram of the shock pulse makes it possible to determine the following parameters of impact destruction: duration of impact destruction  ; stress in destructive elements  ; the magnitude of the impact force ; depth of destructive elements immersion h ; work spent on ice destruction A .