Index Catalog // Arch : Northwestern University Institutional Repository

Description:: The effect of Alkali-Silica Reaction (ASR) on concrete mechanical behavior and the multi-physics considerations that come along are highly complex. Hydration and other chemical reactions occur at the micrometer scale. Hygro-thermal phenomena and concrete cracks due to ASR are typically studied at the meso-scale, i.e. at the aggregate level. At...
Subject:: Mechanics, Materials Science, and Civil engineering
Creator:: Pathirage, Madura
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 01/21/2021
Date Created:: 2020-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15090 and etdadmin_upload_742317

Description:: The staggered (or imbricated) lamellar ``brick-and-mortar" nanostructure of nacre endows nacre with strength and fracture toughness values exceeding by an order of magnitude those of the constituents, and inspires the advent of new robust biomimetic materials. While many deterministic studies clarified these advantageous features in the mean sense, a closed-form...
Keyword:: Nacre, Strength, Probability, Octet-truss, Architected Material, and Size Effect
Subject:: Mechanics, Mechanical engineering, and Civil engineering
Creator:: Luo, Wen
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 01/21/2021
Date Created:: 2020-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15081 and etdadmin_upload_741756

Description:: Phononic crystals and acoustic metamaterials exhibit unique wave propagation properties rising from periodicity and the heterogeneity in material/structure design. One important property is tailoring the propagation of elastic waves from band gaps in such systems – frequency ranges of strong wave attenuation. This thesis first explores the idea of gaining...
Subject:: Mechanics and Civil engineering
Creator:: Han, Jialun
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2018-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:14471 and etdadmin_upload_627248

Description:: Additive manufacturing (AM) processes have advanced rapidly over the last three decades to the point where they have the potential to fundamentally change the way complex parts will be designed and fabricated in the future. Additive methods leverage the ability to join metal particles or molten droplets in a layer-by-layer...
Keyword:: Hydrodynamic, Thermal, Laser Induced Forward Transfer, and Aperture
Subject:: Mechanics, Mechanical engineering, and Civil engineering
Creator:: Zhang, Li
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2018-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_618185 and http://dissertations.umi.com/northwestern:14414

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