An Atomistic Study of the Interacting Crack and Coated Inhomogeneity

Please enable javascript in your browser.

Ghassemi, Mohsen | 2009

757 Viewed

Type of Document: M.Sc. Thesis
Language: English
Document No: 39674 (53)
University: Sharif University of Technology, International Campus, Kish Island
Department: Science and Engineering
Advisor(s): Mohammadi Shoja, Hossein
Abstract:
Classical continuum mechanics fails to give an accurate solution near the crack tip, moreover, it implies that a solid is able to sustain an infinite stress at the Griffith-Inglis crack tips. Among other critical issues is the inability of classical approach to sense the size effect. For these reasons, for more in-depth understanding and accurate behavioral predictions, it is essential to develop some atomistic methods which properly accounts, not only for the structure but also the long and short range atomic interactions effectively. In this work the interaction of coated inhomogeneity and crack under polynomial loading is simulated by using the many body Rafii-Tabar and Sutton potential function which can be used for predicting mechanical behavior of fcc metallic alloys. To make the computer simulation feasible an effective pair-wise potential function based on Rafii-Tabar and Sutton interatomic potential is proposed. The effect of the inhomogeneity size and distance of it from the crack tip on the mode I stress intensity factor of the crack is studied
Keywords:
Rafiitabar-Sutoon Potential Function ; Impurity ; Mode I Crack ; Stress Intensity Factor ; Crack Tip ; Atomic Scale Finite Element Method

No TOC