332: Mechanical Behavior of Solids

Plastic deformation and fracture of metals, ceramics, and polymeric materials; structure/property relations. Role of imperfections, state of stress, temperatures, strain rate. Lectures, laboratory. Prerequisites: 316 1; 316 2 (may be taken concurrently).
At the conclusion of the course students will be able to:
  1. Apply basic concepts of linear elasticity, including multiaxial stress-strain relationships through elastic constants for single and polycrystals.
  2. Quantify the different strengthening mechanisms in crystalline materials, based on interactions between dislocations and obstacles, such as: point defect (solid solution strengthening), dislocations (work hardening), grain boundaries (boundary strengthening) and particles (precipitation and dispersion strengthening).
  3. Apply fracture mechanics concepts to determine quantitatively when existing cracks in a material will grow.
  4. Describe how composite toughening mechanisms operate in ceramic matrix and polymer matrix composties.
  5. Derive simple relationships for the composite stiffness and strength based on those of the constituent phases.
  6. Exhibit a quantitative understanding of high temperature deformation in metals and ceramics, based on various creep mechanisms relate to diffusional and dislocation flow (Coble, Nabarro-Herring and Dislocation creep/climb mechanisms).
  7. Exhibit a basic understanding of factors affecting fatigue in engineering materials, as related to crack nucleation and propagation, as well as their connection to macroscopic fatigue phenomena.
  8. Describe the interplay between surface phenomena (environmental attack) and stresses leading to material embrittlement.
  9. Use the finite element method to calculate the stress and strain states for simple test cases, including a cantilever beam and a material with a circulat hole that is placed in tension.
  10. Use complex moduli to solve mechanics problems involving an oscillatory stress.
  11. Prepare and characterize specimens for measurement of mechanical properties.
  12. Write results from a laboratory project in the form of a journal article, and present their work orally as would be required in a technical forum.
  13. Select materials based on design requirements.