Week 3 - 2D meshing for sheet metal

Aim :-

• 1) To extract the Mid-surface for the given model.
• 2) To generate the 2D mesh on the Given model.

Objective :-

1. Import the CAD model in ANSA
2. for the geometrical errors
3. Pre-processing on given model
4. Mid-Sufrace generation
5. Getting good mesh flow
6. No off Elements

Tool Used :-

• ANSA version 22.1.0

Steps In CAE :-

1) Pre-Precessing

2) Solver

3) Post-Processing

Steps to do for challenge :-

i) Import the given CAD model in ANSA

Files-Open-File Location-Open

ii) Apply Material from Material List

iii)Identify List of components from Property list

• Latch
• Left Hinge
• RIght Hinge
• External extrude Panel
• Internal extrude Panel

iv) Increase CONS resolutions of all COmponents :-

Steps :- Classic Mesh-Permieters- Length

v) for the Geometrical :-

In Totoal 51 Errors are observed,Fixed my auto method and donw the geomerty

vi) Measuring the Thickness of Each Component :-

• Latch :- 1.2
• Left Hinge :-1.2
• RIght Hinge :- 1.2
• External extrude Panel :- 0.75
• Internal extrude Panel :- 0.75

vii) Now Isolate Each Component and extracting the Mid-surface By auto-Mid method :-

Thre are Two method for Mid-surface generation:-

• Auto-Mid
• Manual Mid

For This Model i used auto-mid and Manual mid both option

For External and internal extrude we use Feature area cmd for the selecting multipal edges in one click

viii) Set the PID's for Components :-

ix) Defeaturing and mesh preparation :-

A) As for the min element length criteria failed in the edge regoin of the external extrude, so mentaion guidelines toggle the upper,bottom and one of the center curve of the External extrude by using Faces cut option and feature select options.

B) Defeature the cons on flat surface :-

By using faces cut option

c) Toggle Unnecessary cons without changing shape of original :-

As inner exrude panel in symmentrical not need to do mesh on entire panel by using 'Rm dbl' option trim half panel

x) Meshing :-

Rules to be kept in mind during meshing :-

• Trias should be less but kept where necessary.
• Rotating trias should be avoided.
• Unifrom perimeter No. before start meshing.
• Unncessary Hot point should be removed.
• Element should not be failed for given Quality criteria.

xi) Define Quality Criteria and mesh Parameters:-

Meshig of each component :-

1) Left Hinge

1

2) Right Hinge

3) Latch

4) External Extrude :-

5)Inner Extrude :-

Enable Draw as Shell Option:-

Getting Thickness In PID :-

Learning Objective :-

• Perform clean up for any sheet metal Comp.
• Generate mid-surface by auto/manual method
• Generate shell mesh
• Genetare good mesh along with given meshing criteria
• Working with ANSA

Link for the ANSA Model :-

https://drive.google.com/drive/folders/1D2CvX1KyR4AHEEFY8TLngGv6eg043j_x?usp=sharing