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Ideal Mechanical Strength

Ideal Mechanical Strength. Lindsay O’Brien, Course 22 9/27/12. Clarification of Variables. Potential Learning Landscape. Potential Energy Landscape. Activation Energy. Turning Point. Things to Remember: First derivative of potential is force

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Ideal Mechanical Strength

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  1. Ideal Mechanical Strength Lindsay O’Brien, Course 22 9/27/12

  2. Clarification of Variables

  3. Potential Learning Landscape

  4. Potential Energy Landscape Activation Energy Turning Point • Things to Remember: • First derivative of potential is force • Force = 0 corresponds to minimum or saddle point • When the second derivative of potential is zero, you’re at a turning point Concave Convex http://www.engr.ucsb.edu/~shell/che210d/Exploring_the_energy_landscape.pdf

  5. Shear and Bulk Moduli Hydrostatic!

  6. Measurement of Ideal Stress • Assumptions • Perfect lattice with no defects • Temperature = 0 K Oh no! ɛhydro ɛshear

  7. Prove it! • Electron glue is local (only care about atomic planes directly below and above)

  8. Further Simplification Small Deformation (Small x) Large Deformation (Large x)

  9. Thanks!

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