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AIM: To check for the geometrical errors for the given component. To extract all the mid surfaces of the given component with a suitable method. To mesh all components in the model with the given element Quality criteria. After meshing the component assigned thickness to the model. OBJECTIVE: To write a detailed report…
kevin Ignatious Robert
updated on 03 Feb 2021
AIM:
OBJECTIVE:
QUALITY CRITERIA TO BE FOLLOWED:
Mesh all the components in the given model by using the following quality criteria,
S.No |
Quality Criteria |
Value |
1 |
Target/Average length |
1 |
2 |
Minimum Length |
0.5 |
3 |
Maximum Length |
3 |
4 |
Aspect |
3 |
5 |
Warpage |
15 |
6 |
Skewness |
45 |
7 |
Jacobian |
0.7 |
8 |
Minimum Quad Angle |
45 |
9 |
Maximum Quad Angle |
135 |
10 |
Minimum Tria Angle |
30 |
11 |
Maximum Tria Angle |
120 |
10 |
Tria Percentage |
15 |
1. Target element length:
It is the size of the element by which we can get the most nearer approximate value of the result compared to the experimental result.
2. Minimum element length:
The minimum element length is given by the instructor for the reason of quality criteria to avoid the presence of any zero-length element. It is very important to check for crash analysis.
3. Aspect ratio:
The aspect ratio is defined as the ratio of max element edge length to the minimum element edge length. The ideal value for aspect ratio is 1 but less than 5 is acceptable.
4. Wrap angle:
Wrap angle is defined as the angle between normal of the two planes by splitting the quad elements along the diagonal. Therefore the maximum angle allowed between the two possibilities is called the wrap angle. The ideal value is 0 degree but less than 10 degrees is acceptable for good practices.
The wrap is not applicable in the triangular element.
5. Skewness:
If the quad element is not square and has deformation then the skewness defined as the minimum angle between the two lines joining the opposite mid sides of the element similarly for the triangular element it is 90 minus between the line from each node to the opposing mid-side. The ideal value is 0 but less than 45 degree is acceptable
6. Jacobian:
Jacobian is the scale factor used in the transformation of a co-ordinated system. This is used for a faster analysis point of view. The ideal value is 1 but greater than 0.6 is acceptable.
It is global to the local coordinate system.
METHODOLOGY:
PROCEDURE:
STEP-1
MIDSURFACE:
2-D MESHING:
LEARNING OUTCOMES:
CONCLUSION:
1) We were able to check all the geometry errors and correct them.
2) We had taken mid surface for all components.
3) Finally we meshed the component and applied thickness to the meshed component. The best mesh element percentage we could obtain was 98.09% quads and 1.91% trias for the given component.
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