Studies of Specific Energy Fracture of Ice Using Method Test Samples on Uniaxial Compression

摘要

The most well-known method of determining specific energy fracture of ice is the falling hard spheres method (Drop Ball Test -DBT), when the value of this magnitude is calculated as the ratio of the spent on fracture of ice energy of sphere after it struck on to ice surface to volume of the fractured ice in a sphere imprint in the ice. Earlier studies have shown that the ice crumbling layer by layer in such experiments, and specific energy fracture of ice is fairly stable, with the expressed the temperature dependence of ice only and not dependent on mass and velocity of indenter. But localization processes fracture the ice in the array is different from development fracture in the edge of ice field limited thickness, when ice sheet dissected by the vertical radial cracks and splitting by horizontal cracks on the trapezoidal and wedge-shaped blocks, which not separated from ice cover array in the distance from the contact zone. In this study adopted a form of ice samples trapezoidal beams such as in nature, as well as the scheme of deformation and fracture of samples like the fracture of the edges of these blocks in contact with the surface of penetration into the ice cover of the leg of structure. The objective of the laboratory experiments is the approbation of the testing method axial compression samples of ice trapezoidal and wedge-shaped to determine the specific energy of mechanical fracture of ice.