Week 9-Creation of 1D Connectors Challenge

Connectors in Hyper Mesh

Aim

To mesh the given model according to given criteria and create connections as required.

Procedure

• Criteria for mesh quality is given in table1.

S.N	Quality Criteria	Value
1	Aspect Ratio	5
2	Skewness	45
3	Warping	15
4	Taper	0.5
5	Min. Length	2 Units
6	Max. Length	8 Units
7	Min angle Quad	45
8	Max angle Quad	135
9	Min angle Tria	30
10	Max angle Tria	110
10	Tria %	15

Table 1

• The components for the model can be split into smaller lines so as to get better mesh quality.

Figure1

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• The meshing strategy is to mesh surface by surface a while solving off elements and unnecessary tria elements
• After meshing the surface consider smoothing and/or element optimizing for better mesh flow
• It is a good idea to give nearby components different colours to help differentiate between parts while deploying connections.
• The final meshed component is shown below

Figure7

Figure 8

• After this we can start deploying connectors between different components.The different type of connections deployed will mostly consist of Hexa adhesive,seam welds,spot welds (along with rigid and spring type connections) and bolt welds.
• Enable the connector browser in the view->browser>hypermesh->connector.
  
  
• In the connectors option in 2d mesh panel we go to the bolt option.Select only the holes associated to the hole and the 2 components.

Figure9

• It is necessary to increase the maximum radius to 50 due to the large hole size.

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• Similarly for seam welds , select the node on any one component and set the weld angle as given.Select the components to join and create it.

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• It may be necessary to remesh the surface near the connectors to fix mesh quality,care should be taken to not select elements associated to the connection.
• Similarly for spot weld set the values as shown and select the nodes of any 1 layer.

Figure 14

• You may choose between 2 and 3 layer as needed.

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• Note:you can change the type of connection to rigid/spring type here in the options given.

Figure 17

• For hexa adhesive type mesh, change the type in seam connector tab to hexa adhesive.Select the nodes appropriately and create the connection.
  For multiple layer connections , layer 2 surfaces independent of the third and connect the common surface with the third as shown in figure 21.

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Figure 21

• Similarly deploy connections appropriately for the other portions of the model.

Figure 22

Learning Outcomes

• Connectors in hypermesh
• Remeshing after deploying connections

Conclusion

The model has been meshed according the given criteria successfully after which connections were deployed.