Challenge

Week 4- Challenge

SSoumik Dey3 Feb 2021

AIM :

Create 1D elements on the following component with given 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

d. & e. apply the mass of magnitude 10 with RBE2 link

f. Join the two components with Spring elements

Procedure:

Import the given IGS file in to the Hypermesh from model import option shown in the fig1.01

1. MidSurface Extraction: For the given component extract the midsurface from the given slide which is a sheet of 5mm thickness.

for extraction of mid surface Auto midsurface (Geo>midsurface>Automidsurface) and select the surface, click extract so that it will create midsurface. We can change the type selection by Extraction option shown in the fig.1.1. and fig1.2 show the mid surface of given Comp.

Fig.1.1: Extraction Options

Fig.1.2: Mid Surface

2. Assigning Property: Whatever extracted surface is in a single component. so that organization is required as per the thickness. to do that use the tool Organize (tool>organize) select the type and Dest Component and click on move. similarly for any type of the entity can move Show in the fig2.1.

Create the washer zoon by using Geom>Quick Edit>Washer split by selecting edges. we can see that washer splits in the fig2.1

Fig.2.1: Assigning Property

3. Meshing: Here 2D meshing done by Automesh (2D>Automesh)

Select the surface (Shift+Left mouse button And Drag) and give the element size, Click mesh the following fig3.1 shows mesh elements

Fig.3.1: Meshing

4. Creating RBE2 and RBE3 And joining:

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

Create RBE2 by Regids(1D>Rigids). For the location we can select as a noe or multiple nodes with degree of freedom shown in the fig 4.1

Fig.4.1:RBE2

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 on the dependent node amongst the selected independent nodes.

Creating RBE3 is similarly to RBE2. in the figure 4.2 shows the RBE2 and RBE3 elements

Fig.4.2:RBE2 and RBE3 elements

Join all respective nodes of RBE2 and RBE3 as per memstion cross section with locations for Bar and Beam we can use bar (1D>bar), inside we have defined the type of element from CBAR, CBEAM.

forrod we can use rod (1D>rod), inside we have define type of element from CROD

in the fig4.3 show the bar, beam and rod

Fig.4.3: bar, beam and rod

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

5. Creation Hyperbeam:in Hypermesh we can create different standard cross section such as I, L,T etc

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

it will open a new window to input the value. input the given values shown in the below

cross-section and DOF:

LS REQUIRED :

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

1) Create RBE2 links. Go to 1D->rigids->Select the nodes->Create

2)To create box, go to hyperbeam->standard section->select hyperbeam from drop menu->thinwalled box from bottom drop menu->create.

3)Hyperbeam will open. Give the dimensions of your section and click model view to open hypermesh.

4)Create a new property of rod. select card image as PROD. Assign the beam specification as created in hyperbeam.

5)Go to 1D->rods, select property that you created. Change element types to CROD, select the nodes.