Challenge

Week 4- Challenge

SSiddharth Redkar30 Dec 2020

Objective: To deploy the mesh and create 1D elements on the following component with given cross-section and DOF

Procedure:

Import the given IGS file into Hypermesh from the model import option.

1. MidSurface Extraction: For the given component, extract the mid surface which is a sheet of 5mm thickness.

For extraction of mid surface, Auto mid surface (Geo>midsurface>Automidsurface) and select the surface.

2. Washer splits created around holes and meshing

In the quick edit, the washer splits function is used with an offset value of 5mm.

Select the surface and give the default element size of 10 mm in the auto mesh.

3. Creating RBE2 and RBE3:

RBE2: is the 1D element with infinite stiffness also called Rigid element

Create RBE2 by Rigids(1D>Rigids). For the location, we can select a single node or multiple nodes with a degree of freedom.

RBE3: RBE3's are interpolation constraint elements, where the motion of a dependent node is defined as the weighted average of the motions of a group of independent nodes. The dependent degrees of freedom and weighting factors can be specified or automatically calculated based on the geometry.

RBE3's are typically used to distribute loads applied to the dependent node amongst the selected independent nodes.

Join all respective nodes of RBE2 and RBE3 as per the mentioned cross-section with locations

For creating mass from the Mass tool (1D>masess) select the node and assign mass to it.

For Bar and Beam we can use the bar (1D>bar), we have to define the type of element as CBAR, CBEAM.

For rod we can use the rod (1D>rod), we have to define the type of element as CROD.

Assign appropriate degree of freedoms as given:

Rod element:- with only translational DOF and RBE2 link

Beam element:- with all DOF and RBE3 link

Bar element:- with only x and y DOFs With RBE3 link

Use springs function present in 1D to attach both the surfaces.

5. Creating Hyperbeam: in Hypermesh we can create different standard cross-sections such as I, L, T, etc

for creating 1D>hyperbeam>standard sections>select the hyperbeam>select the type of section and click create.

Cross-section and DOF:

a. Rod element:- with only translational DOF and RBE2 link

Cross-Section: BOX- Dimension a= 12 mm

dimension b=10 mm

Thickness t= 0.75 mm

b. Beam element:- with all DOF and RBE3 link

Cross-Section: I Section- Dimension a= 8 mm

Dimension b= 10 mm

Dimension c= 8.5 mm

Thickness t1= 0.75 mm

Thickness t2= .6 mm

Thickness t3= .6 mm

c. Bar element:- with only x and y DOFs With RBE3 link

Cross-section: CROSS section- Dimension DIM1= 5 mm

Thickness DIM2= 1.2 mm

Dimension DIM3= 10 mm

Thickness DIM4= 1.2mm

Create different properties for Beam, bar, and rod, and assign section respectively shown in the fig below.

Bar:

Rod:

Beam:

Result:

Week 4- Challenge

Ship work like this
in your own course.

Talk to a career counsellor

Ship work like thisin your own course.

Talk to a career counsellor

Ship work like this
in your own course.