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Finite Element Analysis Overview

Finite Element Analysis Overview. Introduction. Aim Review the finite element meshes used by MPI Why do it MPI uses 3 mesh types all have Advantage Disadvantages Understanding the mesh types and capability is critical for their proper application. Terminology. Mesh

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Finite Element Analysis Overview

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  1. Finite Element Analysis Overview

  2. Introduction • Aim • Review the finite element meshes used by MPI • Why do it • MPI uses 3 mesh types all have • Advantage • Disadvantages • Understanding the mesh types and capability is critical for their proper application

  3. Terminology • Mesh • Division of the physical domain into a number of sub-domains, or elements

  4. Beam Triangle Tetrahedral Terminology • ElementA single sub-domain of a finite element mesh • Elements used in Moldflow software are • Two-node linear elements (beams) • Three-node triangular elements (shell) • Four-node tetrahedral elements (3D)

  5. Terminology • Node • Used in a model to • Determine a coordinate position in space • Assign • An injection location • A coolant inlet • In a mesh • Nodes are the vertices of Midplane, Fusion, and 3D mesh elements and the ends of beam elements • Certain analysis results are recorded at mesh nodes

  6. All use Beams Mesh Types Used in Moldflow All start with a CAD Model Tetrahedral 3D Volume FUSION (Dual DomainTM) Midplane

  7. Midplane Fusion Dual Domain™ 3D Solid Mesh Types

  8. Midplane and Fusion Mesh Assumptions • For thin-walled parts • Flowwidth should be at least 4 times the thickness • Uses generalized Hele-Shaw model • Laminar flow of generalized Newtonian fluid • Inertia and gravity effects are ignored • In plane heat conduction is negligible • Thermal convection in gapwise (thickness) direction neglected • Heat loss from edges ignored • Flow analyses includes • Fill • Flow (Fill + Pack) • Gate Location • Molding Window • Runner Balance • DOE

  9. 3D Mesh Assumptions • Designed for thick and “Chunky” geometries • Uses full 3D Navier-Stokes model • Solves at each node • Pressure • Temperature • Velocity, X, Y, Z • Considers heat conduction in all directions • Optional • Inertia • Gravity

  10. QUESTIONS?

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