Continuum Simulation Monday, 9/30/2002.

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Presentation transcript:

Continuum Simulation Monday, 9/30/2002

Class Progress Visualization: abstract concept (stress,2D, 3D), mechanical field Stochastic simulations: random walk, Brownian movement Monte Carlo method (MC) Ensemble Molecular Dynamics (MD) Trajectory Continuum simulation Finite Element Method (FEM); Material Point Method (MPM) Multiscale simulation Adaptive Mesh Refinement/Coarsening; Renormalization

Continuum vs. Atomistic Matter Indefinitely divisible Atom aggregate Interaction Stress; strain Interatomic force Model Constitutive model Potential model

Continuum Problems Equilibrium equations: Material constitutive equations (linear): Boundary conditions

Discretization in Finite Element Method (FEM) The basic concept is that a body or structure may be divided into smaller elements.

Discretization in Material Point Method (MPM) Solid line is an outline of the body analyzed. Black dots are the material points. Dashed lines show a regular, background grid for calculation.

Lagrangian & Eulerian Description the velocities are given at fixed points in space as time varies. Imagine a case where both the measuring device and the frame of reference are fixed. Lagrangian: quantities like position, velocity, stress, are given for a particular moving particle at varying times.

Approximation to Region MPM FEM

FEM Simulation of Crack Tip Process

MPM Simulation of Crack Tip Process

Adaptive Mesh Refinement/Coarsening

MPM Simulation of Fragmentation