Since the operating conditions of nanolayer systems are usually stochastic, modeling the processes occurring in them requires the use of probabilistic methods. The application of the method for calculating percolation by nodes and bonds for solving the problem of stochastic loading of nanolayer structures is facilitated in comparison with those usually used in various physical and technical problems. In this case the impact is not carried out at the boundary of the two-dimensional region of the nanomaterial, with the finding of stresses and strains inside the layer. Instead, stresses and strains are determined in the very surface layer of the material under the influence of an external load. Here we show that with an increase in the number of nodes and bonds in the system, the development of a crack is slow down and that the use of layered systems with a superlattice crystal structure, with minimized internal residual stresses, can provide increased crack resistance.
Fatigue microcracks, caused by mechanical or thermal impacts, are formed during periodic stretching and compression of the upper layers of nanostructured materials. Then, the microcracks grow further and merge, leading to the cleavage of the material fragment and its subsequent destruction. In this work, we have performed calculations and transfer showing that it is necessary to structure nanomaterials in such a way as to form residual compressive stresses, which can serve as a barrier to crack propagation, in them. Here we also show that shear stresses are largely responsible for initiating the microcrack formation in nanostructured materials.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.