Experimental study of mechanical properties of structural materials applying nanoindentation method

In the given work, several materials were selected for comparative experiments applying the nanoindentation method. These materials are widely used in the aerospace industry and are of interest from the point of view of experimental evaluation of mechanical properties by various methods for the purpose of further modeling and forecasting the properties of products made of this class of materials. The following materials were studied: 12X18N10T steel, carbon-carbon composite material with a rod frame and a pyrocarbon matrix, with a cut in the z-axis direction (UUKM-S), carbon-carbon composite material with a needle-punched frame and a pyrocarbon matrix, with a cut in the punching direction along the z-axis (UUKM-I). During the work, the structural elements of the composites (rod and matrix) were also studied. It was found that the degree of surface roughness significantly affects the properties of the materials tested by the nanoindentation method. At the same time, increasing the maximum load to 200 mN and choosing a spherical conical indenter allows us to significantly reduce the effect of surface roughness on the obtained mechanical properties of steel and carbon-carbon composite samples. For all the composite samples studied, creep curves were obtained during nanoindentation with steps indicating the onset of destruction/cracking processes. However, this effect is not typical for the rod (UUKM-S) at a low load (50 mN) and for the composite sample with a needle-punched frame (UUKM-I), for which typical creep curves were obtained.
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