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    Understanding the response of glasses to sharp contact loading via classical molecular dynamics simulation

    Author
    Liu, Haidong
    View/Open
    Liu_rpi_0185E_12111.pdf (9.872Mb)
    Other Contributors
    Huang, Liping; Picu, Catalin, R; Sundararaman, Ravishankar; Shi, Yunfeng; Tomozawa, Minoru;
    Date Issued
    2022-12
    Subject
    Materials engineering
    Degree
    PhD;
    Terms of Use
    This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute (RPI), Troy, NY. Copyright of original work retained by author.;
    Metadata
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    URI
    https://hdl.handle.net/20.500.13015/6328
    Abstract
    Glass materials have enabled many products for a wide range of applications. One downside of oxide glasses is that they are very susceptible to crack under sharp contact loading. There have been extensive studies in experiments to understand the deformation mechanisms and to improve crack resistance of glass. However, conducting in-situ characterizations in real-time experimentally is challenging, which has mostly limited our understanding of glass deformation and cracking behaviors under sharp contact loading. This study conducted nanoindentation tests using classical molecular dynamics simulation to understand how the stress/strain fields and the structure of glass evolve under sharp contact loading from an atomistic perspective. First, we used the 2.5D nanoindentation method in sodium aluminosilicate and sodium aluminoborate systems to illustrate the structural origin of the improved crack resistance of boron-containing glass. To generate stress/strain fields and deformation patterns in glass that can be directly compared with instrumented experimental studies, we developed a 3-D nanoindentation protocol to mimic real-life loading conditions, and applied it in a model metallic glass favoring shear flow to understand the shear band activation/interaction mechanism. After validating our results with multiple experimental studies, we conducted more 3-D nanoindentation simulations in metallic and silica glasses with different densification abilities. The comparisons between silica and metallic glasses suggest that balancing shear deformation with a combination of instantaneous and permanent densification can provide multiple pathways to dissipate energy under indentation, thus increasing the load to initiate cracks and improving the damage resistance of glass.;
    Description
    December 2022; School of Engineering
    Department
    Dept. of Materials Science and Engineering;
    Publisher
    Rensselaer Polytechnic Institute, Troy, NY
    Relationships
    Rensselaer Theses and Dissertations Online Collection;
    Access
    Restricted to current Rensselaer faculty, staff and students in accordance with the Rensselaer Standard license. Access inquiries may be directed to the Rensselaer Libraries.;
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