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Surface modifying complexes with nanolayer architecture are widely used in various fields of activity (optical systems, tribological pairs, cutting tools, etc.). In many cases, brittle fracture as a result of active cracking is the key or even the dominant mechanism for the destruction of such complexes. The report discusses the factors that can slow down the development of cracks in nanolayer systems and, thus, increase their resistance to brittle fracture. Both theoretical substantiation and practical examples of crack propagation inhibition are presented. The influence of the crystalline structure of the coating on the cracking pattern has been studied. The investigation has found the significant effect of the crystalline structure of the coating layers on the cracking pattern. It can be noticed that in addition to the nanolayer structure, the pattern of crack propagation can also be affected by the crystalline structure of the coating. With a decrease in the deformation energy, the intercrystalline interfaces have a greater influence on the crack growth direction, and the crack can stop, resting against a crystal boundary. Thus, during the further modeling, it is also important to take into account the influence of the crystalline structure of the nanolayers.
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