Week 3 - 2D meshing for sheet metal

                                                                        MESHING OF CAR HOOD MODEL

AIM:

To create midsurface , check geometrical errors and create proper mesh flow of given quality crietria of the car hood Cad model.

SOFTWARE USED :

Preprocessing software - ANSA V 22.1.1

GIVEN DATA : 

• Cad model
• quality criteria

                             CAD model of hood

          

                            Quality criteria of the hood

                  

PROCEDURAL STEPS :

STEP 1: Set syntax as performance_mode 3 to avoid performace issue

STEP 2: Import the given CAD model of car hood stp file  

                                Inner hood

              

                                         outter hood

             

STEP 3:  Represented of single , double and triple cons.

             Removal triple cons using CONS _ RELEASE and perform TOPO by changed to double cons.

             Perform the TOPO to connect the surface of a CAD Model.

                                 Before removal of triple cons

                

                               After removal of triple cons

              

                            CAD model without TOPO                                                                                                                          

                     

                               CAD model with TOPO

              

STEP 4:  Incraese the cons resolution by MESH_ PERIMIETER_LENGTH = 5mm

STEP 5:Assign material properties and check manager 

STEP 6: Store the lock views of the inner hood and outter hood

STEP 7 : Thickess measured and assigned thickness value in PID 

                                            Thickness measurement

             

                                               Set PID values

              

STEP 8: Extract midsurface creation by skin option in inner and outter hood model

                                                Midsurface of inner hood 

 

                                                         Midsurface of  outter hood  

                                                    midsurface of inner and outter hood

STEP 9 :Set PID of the faces of the inner and outter hood.

             TOPO_ FACES_ SET PID for assigned thickness

STEP 10 : Before go to the meshing, Set quality criteria parameters in MESH PARAMETERS & QUALITY CRITERIA for the given value.

STEP 11: Half portion of the inner hood meshed as per given quality criteria

 STEP 12: mirrored the inner hood using TANSFORM_COPY_SYMMETRY_MIRROR 3 POINT AXES

STEP 13:Created FEM model using ELEMENTS_RELEASE_SELECT ALL FACES

 STEP 14:Same as before did the outter hood and other 3 parts meshed and released

STEP 15: Enabling thickness as per measurement of the ovearll hood

                                                                    Before enabling thickness

                                                                      After enabling thickness                        

    

RESULT :

Hence midsurface has been extracted to the parent geometry.

Hence there are no surface deformation in this geometry.

A well connectivity has been established between the surfaces.

The features have been captured properly.

A good mesh flow have been achieved with zero elements failing for quality.

LEARNING OUTCOMES:

In this week 3 car hood challenge , i came to know

How to extract midsurface automatically for the sheet metal componenet.

How to clean the geometry.

How to generate proper mesh flow with low tria percentage.

How to assign thickness to the component.