Learning Module: Atomic Picture of Plastic Deformation in Metals
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1 | - | The main goal of this learning module is to introduce students to the atomic-level processes responsible for plastic deformation in crystalline metals and help them develop a more intuitive understanding of how materials work at molecular scales. The module consists of:
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+ | The main goal of this learning module is to introduce students to the atomic-level processes responsible for plastic deformation in crystalline metals and help them develop a more intuitive understanding of how materials work at molecular scales.
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3 | - | + | The module consists of:
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4 | - | Jump directly to the learning module or continue reading for the module’s rationale, learning objectives, and target audience.
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+ | * Two introductory lectures (50 minutes each) available online as audiovisual presentations
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5 | - | Why MD simulations?
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+ | * [[Resource(8038)]]
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6 | + | * [[Resource(8043)]]
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7 | + | * Hands-on lab involving online molecular dynamics (MD) simulations via nanoHUB.org
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8 | + | * [[Resource(8140)]]
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10 | + | Jump directly to the learning module by clicking on the links above, or continue reading for the module’s rationale, learning objectives, and target audience.
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12 | + | = Why MD simulations? =
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14 | MD provides a very detailed description of materials and its processes by describing the dynamics of each individual atom in a material. Such a realistic descript of materials has an enormous educational potential and, unlike simple toy models or cartoons, can help students understand how materials look and work at atomic scales. | |||
15 | - | If you are interested in learning more about MD, |
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16 | - | Learning objectives
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+ | If you are interested in learning more about MD, see: [[Resource(5838)]].
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18 | + | = Learning objectives =
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20 | Upon completion of this learning module most students will be able to: | |||
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22 | - | + | * Compute stress strain curves of metallic nanowires using online MD simulations with the nanoMATERIALS simulation tool and explore the role of size, temperature, and strain rate;
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23 | - | + | * Compute the strength of perfect nanowires and compare it with that of polycrystalline samples;
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24 | - | + | * Understand the role of pre-existing dislocations on the yield stress of metals;
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25 | - | + | * Understand the orientation of the active slip plane with respect to the tensile axis for uniaxial deformation;
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26 | + | * Understand the atomic displacements that lead to plastic deformation in single crystal nanoscale wires
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27 | Some students are expected to: | |||
28 | - | + | * Understand the difference in activation associated with dislocation nucleation and their propagation;
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29 | - | + | * Identify the active slip system (slip plane and slip direction) from the MD simulations
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30 | - | + | * Explore strain hardening focusing on the difference between annealed and cold worked macroscopic samples and nanoscale specimens;
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31 | - | + | * Explore and understand compressive vs. tensile asymmetry in uniaxial deformation of nanowires;
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33 | Instructors can build on this learning module to teach Schmid law and the calculation of Schmid factors for fcc crystals as well as the specimen rotation during single glide. | |||
34 | - | Audience
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35 | + | = Audience =
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37 | This learning module was designed for and used in an introductory course for second-year students of Materials Engineering at Purdue University. Students will find this learning module most useful if they are familiar with the following topics: | |||
38 | - | + | * Basic physics of classical mechanics;
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39 | - | + | * Mechanical response of metals (elastic and plastic deformation, yield strength, and work hardening)
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40 | - | + | * Basic knowledge of crystal structures (common crystal structures of metals, crystalline planes)
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42 | We expect this module to be useful in introductory and advanced courses of the mechanical response of materials and nanoscience at the undergraduate and graduate levels. |