Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/78512
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dc.contributor.authorMuhammad Irfan Jupri
dc.date.accessioned2019-06-21T01:15:20Z
dc.date.available2019-06-21T01:15:20Z
dc.date.issued2019
dc.identifier.urihttp://hdl.handle.net/10356/78512
dc.description.abstractThis paper aims to study crack nucleation in nanocrystals due to a twist disclination dipole. Additionally, the critcal twist disclination strength and critical equilibrium crack length upon crack nucleation were also observed. Crack nucleation was predicted by comparing the energy states of uncracked and cracked solids. On the other hand, the critical equilibrium crack length could also be determined. This happens when the equilibrium stable and the equilibrium unstable crack lengths are equal to each other. Computational methods for energy analysis and a Zener crack model were used to conduct this study. According to the energy analysis conducted, cracks can only be nucleated in favourable energy conditions. Furthermore, it was proven in the that both stable and unstable cracks exist. It was hypothesised that crack nucleation, critical twist disclination strength and critical equilibrium crack length are dictated by material, geometrical and loading parameters. The findings of this study suggest that the critical twisting strength decreases with the increasing grain size. On the other hand, the critical equilibrium crack length increases with the grain size. It was also observed that the critical twisting strength increases with the disclination core size. However, the critical equilibrium crack length decreases as the disclination core size increases. It can be argued that the grain size of the crack solid and the disclination core size are inversely proportionate to one another since they have opposing effects on critical twist disclination strength and critical equilibrium crack length.en_US
dc.format.extent79 p.en_US
dc.language.isoenen_US
dc.rightsNanyang Technological University
dc.subjectDRNTU::Engineering::Mechanical engineeringen_US
dc.titleStudy of rotational defects and failure of plastically deformed nanocrystalsen_US
dc.typeFinal Year Project (FYP)en_US
dc.contributor.supervisorWu Mao Seeen_US
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.description.degreeBachelor of Engineering (Mechanical Engineering)en_US
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Appears in Collections:MAE Student Reports (FYP/IA/PA/PI)
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