Week 3
AIM - TO CREATE A 2D MESH IN THE HOOD OF A CAR ACCORDING TO THE QUALITY CRITERIA
WHY WE CARRY OUT MESHING
THIS IS BEACOUSE WHY THE ORIGINAL COMPONENT HAS INFINTE NUMBER OF ATOMS WHEN WE APPLIED ANY FOCE THE DISPLACEMENT OR STRAIN HAPPEND EACH AND EVERY ATOM BUT IT IS IMPOSSIBLE TO FIND INFINTE NUMBER OF DISPLACEMENT HAPPENED ON IT SO WE NEED TO MAKE THE CALCULATION FINITE.SO FOR THAT WE DIVIDE THE COMPONENT IN TO FINITE NUMBER OF ELEMENTS HAVING FINITE NUMBER OF NODES.MOST POPULAR 2 D ELEMRNTS ARE QUADES AND TRIAS.TRIAS ARE BEING STIFFER COMPAIRED TO QUADS THEY HESITATE TO TRANSFER THE FORCE APPLIED ON IT TO NEAR BY NODES SO THETY ARE TO BE NEEDED TO MINIMIZE IN THE MESHING .
PROCEDURE-THE GIVEN COMPONENT IS A HOOD OF A CAR IT HAS MAINLY 4 COMPONENTS AS HINGE REINFORCEMENT,LATCH REINFORCEMENT AND AN INNER PANEL AND AN OUTER PANEL,THE THICKNESS OF HOOD IS VERY LOW SO INSTEAD OF GOING 3D MESHING WE CAN GO TO 2D MESHING
MAIN PROCEDURES ARE
1 GEOMETRY CLEAN UP OF THE GIVEN CAD MODEL
2 EXTRACT MID SURFACE OF EACH INDIVIDUAL COMPONENT
3 MESH THE COMPONENTS
CAD MODEL NEEDS TO BE IMPORTED IN TO ANSA GUI.THIS IS DONE BY FILE >OPEN>SELECT CAD FILE>OPEN
THEN CAD FILE WILL BE OPENED IN ANSA SINCE THE PLATFORMS IN CAD AND CAE ARE DIFFARENT HENCE THERE WILL BE MANY TRANSLATIONAL ISSUES IN THE MODEL THAT IS IMPORTED. FIRST WE NEED TO TOPOLOGICALLY CLEAN UP THE HOOD COMPONENT TO TOPOLOGICAL CLEANUP THE COMPONENT SHOULD BE IN TOPO MODULE BEFORE THAT CHECK THE TOPOLOGICAL ERRORS OCCURED DUE TO THE PLATFORM CHANGE BY USE OF CHECKS MANAGER IN ANSA FOR THAT GO TO CHECKS MANAGER>GEOMETRY>EXECUTE SO WE CAN FIND THE TOPOLOGICAL ERRORS IN THE MODEL WE CAN GO TO EACH PART AND RECTIFY THE ERRORS
THE NEXT STEP IS TO EXTRACT THE MIDSURFACE OF THE COMPONENT FOR THIS COMPONENT WE CAN GO FOR AUTOMATIC MIDSURFACING MID SURFACE OF EACH PART CAN BE EXTRACTED USING MIDSURFACE>SKIN>SELECT THE COMPONENT FOR MIDSURFACING>MIDDLE CLICK IT WILL GIVE THE MID SURFACE OF THE COMPONENT ONE SIDE WILL BE RED OTHER SIDE IS IN GREEN THICKNESS WILL BE IN BLUE.
AFTER MID SURFACE EXTRACTION WE NEED TO CLOSELY IN TO THE MIDSURFACE OF EACH COMPONENT LOOK FOR SHARP EDGES IN THE COMPONENT IT WILL FAIL THE MINIMUM LENGTH CRITERIA MINIMUM LENGTH IS ABOUT 2MM. SO CHECK THE SHARP EDGES AND REMOVE IT BY CUT OPTION,FOR MEASURE WE CAN USE MEASURE OPTION IN THE UTILITIES AND SELECT THE 2 NODES IN BETWEEN WHICH WE NEED TO FIND THE DISTANCE THEN ANSA SHOWS THE DISTANCE
THEN WE CAN GO TO MESH GENARATION FOR THIS WE NEED TO MOVE MESH MODULE AND WE NEED TO SET QUALITY CRITERIA IN UTILITIES PANAL GIVE THE VALUES OF SKEWNESS,WARPING,ASPECT RATIO,JACOBIAN,MINIMUM AND MAXIMUM LENGTH,MINIMUM AND MAXIMUM ANGLE OF QUADS AND TRIAS,PERCENTAGEW OF TRIAS EDIT EACH ONE OF VALUES WITH DESIRED VALUES THEN CLICK ON APPLY TO SEE QUALITY CRITERIA WE NEED TO GO FOR HIDDEN MODE TO SEE FAILING ELEMENTS WHILE MESHING WE CAN MESH SURFACE BY SURFACE FOR MESHING WE CAN USE BEST OPTION THIS OPTION HAS THE BEST ALGORITHAM FOR THE DIFFARENT SHAPES OF SURFACES AND WE HAVE NOT SATISFIED THE MESH WE CAN RECONSTRUCT THE MESH BY USING RECONSTRUCT OPTION IN THE MESH GENARATION PANEL.FOR COMPONENTS WHICH ARE SYMMETRIC WE ONLY NEED TO MESH HALF OF THE AREA WE CAN USE SYMMETRY OPTION FOR COMPLETE REFLECTION OF HALF MESH FOR THE OTHER SIDE
IMPORTENT THINGS WHILE MESHING
THERE SHOULD NOT BE ANY OPPOSIT TRIAS IF IT OCCURING USE SPLIT OPTION TO AVOID
SMOOTHING COMMAND IS USED FOR SMOOTHENING MESH FOR GETTING GOOD MESH FLOW
ADJACENT TRIAS MUST BE REMOVED
ALWAYS MESH BY AWAIRING OF QUALITY REQUIRMENTS TRIAS SHOULD NOT BE PRESENT AT THE EDGES OF THE COMPONENT AND SHOULD NOT BE ORIGINATED FROM PERIMETERS 
CONCLUSION
THE GIVEN MODEL IS MESHED AS PER THE QUALITY CRITERIA AFTER MESHING THICKNESS OF COMPONENT HAS TO BE ASSIGNED FOR THE GIVEN COMPONENT