2D meshing for Plastic component using ANSA

Objective :

To deliver 2D meshing for Plastic components. By Taking the mid surface for all the components after checking the geometrical errors and mesh the mid surface with the given element Quality criteria.

Model :

Setting up perimeter - Perimeter Length & Macros :

The Target element size is given here as 1, which considered for the element. Giving proper flow

>>

Check Property :

In property window check for the components present, and their properties can be edited or modified.

Creating Mid Surface :

Mid surface can be created manually or automatically. The automatic mid surface often doesnt provide, good surface extraction and so, Here we use manual method process

Topo >> Face >> Offset

make sure of the direction of the offset being made and press ok

Geometry Check :

This part is used to clean up errors in the geometry, helping in clearing the cracks, collapsed cons, Triple cons, Needle face, etc.

Tools(Slide arrow) >> Checks >> Geometric checks >> Execute

select the errors and choose auto fix, in which maximum issues will be solved.

The Triple cons are due to attachment of third surface on two existing surfaces and can be ignored in mid surface model.

Setting Quality Criteria :

Toolbar >> Quality Criteria

Type the data and Save it, which will be saved as ANSA_QUAL File (.ansa_qual). Which can be retrived later when required.

Quality criteria conditions:

Major Tools Used :

Cut : To cut perimeter area with 2 perimeter nodes or hot points

Join : Can be used to join macro areas

Set PID : To assign property to seperated region or created one

Paste : To paste nodes helps in moving elements backwards

Remesh : Create mesh on macro region

Erase : Clears the mesh

Improve : Mesh flow is improved

Reconstruction : Elements are reconstructed by algorithm on meshed region

Reshape : Similar to reconstruction with much improved flow quality

Smooth : Smothing the area of element, which undergoes modifciation on manual element edit

Hidden option is enabled to check the quaity threshold and thereby create quality mesh

By using these major tools the component is meshed on macro regions and will be as,

The Meshed Model :

Quality of Mesh :

The Meshing has about 27 failed elements in which they cannot be fixed due to geometric constraints.

for example, in this failed elements, there are 2 ribs, which constraints flow of the mesh and cannot be fixed with above criterian.

Conclusion :

The mesh delivery is done with satisfied quality criteria and proper mesh flow.