Assignment 1-2D Meshing Challenge

OBJECTIVES:

To

clean the geometry

extract midsurface

clean midsurface geometry

ignore holes less than dia 5 mm

create 2D mesh with target length 5 mm, min 3.5 mm , max 7 mm and assign proper thickness

by creating a generic property for 3 components.

A. GEOMETRY CLEAN UP

1. Import the part-1.hm file to hypermesh under radioss profile

2. The component has more free edges and duplicate faces. Using Quick edites> delete surf delete duplicate surfaces. Toggle edges is used to stitch the free edges by increasing tolerance values. Quickedits> Filler surface is used to fill the deleted surface.

3. Surface edits > trim is used to trim surfaces andlater can be toggled.

4. Using wireframe mode we can check the geometry for free edges.

B. MIDSURFACING

1. GEOMETRY> MIDSURFACE using offset + planes+sweep , the surfaces are selected and midsurface is created.

2. Fill the holes less than 5mm diameter using Quick edits> filler surf and suppress the lines using toggle edges.

3. Toggle the unwanted features lines that could fail for min length

C. MESHING

1. Set the mesh parameters and quality criteria , min length is 3.5 mm, max length is 7mm

2. 2D>Automesh the component with target element size 5mm.

3. Under 2D>Quality index, cleanup the elements that fail. Driag tria elements ,place nodes,element optimize are effectively used to clear quality elements fails.