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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Next, we determined the cross-sectional area of the destructive element at the point of gluing the sensor in order to convert the function ( ) into the force one ( ) . The equation of motion of the rod with the impactor and the tool when hitting ice can be expressed as follows: . (1) where m is the mass of the impactor system. To determine the area bounding the graph of the function ( ) , we graphically integrated the function: (2) It should be noted that it was not always possible to approximate the curve ( ) with an equation of an elementary function. In these cases, based on the resulting graph, a graph ( ) was constructed in the form of a triangle, the area of which is equal to the area ∫ ( ) , the height of which corresponds to the maximum force on the oscillogram, and the conventional depth of immersion of the destructive element in the ice is: ∫ ( ) (3) The repeatability of the experiments was 5. The sequence was as follows: install the pile driver on a mass of ice; check the readiness of the measuring system; raise the impactor to the required height; preserving the order of the experiment, we place rubber under the blade of the destructive element and record the oscillogram of the shock pulse. The obtained experimental data were processed using the least squares method. 3. Research results and discussion Let's consider and analyze one of the oscillograms obtained under the conditions t=-4 ° C and H=40mm (see Fig.3).

Fig. 3. The resulting oscillogram of the reflected pulse under the conditions: t = -4 C, H =40 mm.