Abstract
Causes of failure mechanisms can only be found at the level of the dynamics of atoms and molecules. However, the subject of dynamics at the level of atomic structure is very complex, especially in terms of modeling and computations. An interesting way to better understand relationships between macro world and atomic realm is to develop Experimental Mechanics techniques that can provide a verification of developed models at the nanometric and subnanometric levels, guiding the derivation of comprehensive but manageable models. This paper will describe how to apply classical EM methods to establish a bridge between classical continuum mechanics variables and the atomistic analysis of solid mechanics. In particular, we analyze the role of the Cauchy-Born rule as standard tool applied in theoretical and numerical methods to describe the continuum utilizing atomistic arguments. Experimental evidence of the validity of the Cauchy-Born rule will be discussed for the case of SiC crystal including dislocations. Likewise, we will examine how to handle the onsets of plasticity and fracture.
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Sciammarella, C.A., Sciammarella, F.M., Lamberti, L. (2017). Merging Experimental Evidence and Molecular Dynamics Theory to Develop Efficient Models of Solids Fracture. In: Ralph, W., Singh, R., Tandon, G., Thakre, P., Zavattieri, P., Zhu, Y. (eds) Mechanics of Composite and Multi-functional Materials, Volume 7 . Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-41766-0_10
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