Extraction of Bulk Material Properties from Phonon Dispersion Spectra

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Experimental characterization of mechanical behavior of nanostructures can be cumbersome and expensive. Design of nano-structured materials with properties tailored to meet macro-scale requirements invariably requires model-based understanding of the structure-to -property relationships. In this effort, the elastic and fracture behavior of single crystal materials are studied using equilibrium Molecular Dynamics (MD). The atomic structure of the material simulated with suitable periodic and finite dimension models. The temperature at which the properties are determined is reached by using a slow equilibrium procedure that produces a convergent initial energy and stress states before mechanical loading is applied. Fracture is simulated by creating a crack at the center of the model by removing the interaction between two adjacent planes of atoms. Gold lattices are used in numerical illustrations. The elastic behavior as well as the effect of damage initiation can be observed in the time-domain and frequency-domain responses of stress and energy states in the model. Appropriate comparisons are made between the properties determined from modeling and experimental data from the bulk material.

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Journal: TechConnect Briefs
Volume: 2, Nanotechnology 2009: Life Sciences, Medicine, Diagnostics, Bio Materials and Composites
Published: May 3, 2009
Pages: 523 - 526
Industry sector: Advanced Materials & Manufacturing
Topics: Composite Materials
ISBN: 978-1-4398-1783-4