Week 12:Project-1-Meshing of Door Inner Panel Challenge
Week 12:Project-1-Meshing of Door Inner Panel Challenge:
objective: To extract the midsurface for the given side door and meshed with mixed element type with the given quality criteria and assign thickness for the each of the component.
img:orginal model of the side door
procedure:
- first import cad model(side door) to the hypermesh by going to import ⇀ import geometry⇀ side door(stp file)⇀and click import.
- once the hood file is imported extract the mid surface through the offset method by going to surface edit⇀ offset⇀and select the surface which you want to offset.before offsetting duplicated the surface and again select the surface by face and enter the half of the original thickness value and check the normal and offset to its midplane.
img:midsurface of the side door
- before meshing of the side door check the component if there is any error.
- separate the side door with lines by using either split surface node or split surface line which can be accesed by geometry ⇀ quick edit ⇀ split surface line or split surface node. by using either of this option we can create a split line in between the side door
- And also insert the quality criteria before meshing by going to preference in the window which will be available at the top preference ⇀ criteria file setting.
- go to the 2D ⇀ automesh ⇀ select the surface to mesh ⇀click 'ok'. choose the element size as 4 and choose mixed mode option because the side door is for crash test.
- use smooth option for align the mesh in a good fashion manner by going to 2D⇀smooth⇀select the elements⇀and click smooth or click shift+F12, we can smooth with respect to the shape and size.
- while meshing keep on checking the eqality error and try to reduce it.
img:meshed surface of the side door
- once the model is meshed cheeck for the free edge in between the node and element because if the nodes are not connected the accuracy will not be good and the force transmission will not be good.
- we can close the free edge by two option by going F3 which is replace node option used to connect the node for free edge and also to control thr meshing error.
- free egde can be identified by going to Tool ⇀ edges⇀ click the elements and select the displayed elements⇀and click free edge.
- once the free edge is identified we can equalize it it is in the same option.
- after meshing create a property for these components as we want to assign the thickness for this component
- go to the model bar space on the left side ,right click and choose property and rename it and enter the parameters in the property bar like thickness and the elements as PSHELL
- now click on the original extrcat file and assign the property to that file for respective component weith respective thickness.and select the 2D element representation to see the assigned thickness.
- before submitting,check the shell normals of the FE model of side door.
img:shell normal of the meshed side door
img:final FE model of the side door
result:
- the midsurface are extracted from the given model and mesh the model with mixed type of element with given element length with respect to the quality criteria.
- elements are created as per the criteria and elemets quality are improved as much as possible with minimal error
- good mesh flow pattern is achieved.
- free edges are checked and removed.
- thickness has been assigned as per the model by creating property .
- shell normal is checked.
learning outcome:
- learned how to extract the midsurface using surface offset method.
- learned how to import and change the criteria setting
- learned how to split a geometry to achieve a good mesh flow and mesh pattern
- learned how to assign thickness and how to check quality error and repair it.