1. Project III Q&A Friday, 11/15/2002

2. MPM Simulation on Contact

3. Timestep (upper limit) We cannot expect to simulate waves with a velocity higher than let dynamic information to pass one cell size in just one steps. We can take

4. Timestep (lower limit) Also we hope to finish the simulation in reasonable (say 1000) steps. If one step takes about 6 second, the whole simulation needs

5. Plate Velocity Example: The plate velocity can not be too slow, otherwise you need too many steps to complete the simulation.

6. No Criterion Needed on Contact Give the initial velocities, and let go!

7. Monte Carlo Simulation

8. Essence of MC Position change and external force introduce potential change. Lennard-Jones potential

9. Essence of MD Internal forces External forces

10. Continuous Simulation Things you can simulate: (1)Displacement, strain, stress field; (2)Number of elements in x and y direction controllable; (3)Variable Young’s modulus to mimic composites. (4)Damage evolution using von Mises criterion.

11. Curved Dislocation Containing Screw and Edge Components

12. Frank-Reed Source for Dislocation Multiplication Slipped area is shaded.

13. Balanced Displacement Field Around A Edge Dislocation