PSI - Issue 59

Mykola Holotiuk et al. / Procedia Structural Integrity 59 (2024) 531–537 Holotiuk et al. / Structural Integrity Procedia 00 (2019) 000 – 000 5 To analyze the oscillogram, let us select the characteristic areas on it. Section I is characterized by the fact that there are no stresses in the destructive element ( ) . This indicates that the pulse is being reflected under the conditions of a free end. In section II we have a sharp increase in stress to a maximum value, which is explained by the compaction of the ice. Over a certain period of time a stress zone forms in the ice body. The stress value increases, and when the tensile strength of the ice is exceeded, destruction occurs, which manifests itself in the form of a crack. During this period (section III), the stress in the destructive element decreases. The next (IV) section is characterized by transmitting the next impact pulse into the ice body. The pulse amplitude is greater than the amplitude of the second section. After reaching the peak value, a sharp decrease in stress is observed, which corresponds to the breaking off of a certain volume of ice from the block. Fig. 4a, b, c, d, e, f shows the destruction process of the ice block. 535

a

b

c

d