Week 4-1D Element Creation Challenge

1D Element creation challenge using Hypermesh:

Aim:

To mesh the Given component with the Size of 5 Units. Create 1D elements on the following component with given cross-section and DOF.

Given data:

a. Rod element:- Translational DOF should be Constrained with RBE2 link

Cross-Section: BOX- Dimension a= 12 mm

dimension b=10 mm

Thickness t= 0.75 mm

b. Beam element:- All DOF should be constrained with 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:- Constrain only x and y DOFs With RBE3 link

Cross-section: X 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 the RBE2 link

f. Join the two components with Spring element.

PROJECT METHODOLOGY:

1. Mid-Surface:-

• Auto mid surface has been used to extract the midsurface for this simple bracket.
• Components has been created and assigned to the particular mid surfaces.

2. ASSIGN MATERIAL:-

• Create Material.
• Here I have created a material and assigned to steel.

3. ASSIGN PROPERTY:-

• Create property
• Enter thickness value and element type.
• Also assign this property to the particular component and material.

4. WASHER SPLIT:-

• Washer split is used to capture the mesh near the holes properly.
• The washer split offset value is given to 5 units in this project.

5. 2D Mesh:-

• For this project auto mesh has been performed for the element target length of 5 units.

6. 1D ELEMENTS:-

• Some 1D elements used in the project are:

• PBAR
• PROD
• PBEAM
• RBE2
• RBE3

• As per given details we have deployed the 1D elements.
• To deploy bar, beam, rod elements hyperbeam has been used.
• Where hyperbeam is used to create cross-sections.

HYPERBEAM:

From the given data, a. rod element, b. beam element, c. bar element we will be creating a cross sections using hyper beam.

a. Rod element(Cross-section box):

• The given cross section details for rod elements are,

• Cross-section Box
• Dimension, a=12 mm, b=10 mm, t=0.75 mm

• To create this cross section (Go>1D>Hyperbeam>Create>Standard section>Hypermesh>Thin walled box).
• The standard cross section shape will be created and enter the given dimensions data as shown in the below figure.

b. Beam element(I-section):

• The given cross section details for beam elements are,

• Cross Section: I section
• Dimension: a= 8 mm, b= 10 mm, c=8.5 mm
• Thickness: t1=0.75 mm, t2=0.6 mm, t3=0.6 mm

• To create this cross section (Go>1D>Hyperbeam>Create>Standard section>Hypermesh>I-section).
• The standard cross section shape will be created and enter the given dimensions data as shown in the below figure.

c. Bar element(X-section):

• The given cross section details for beam elements are,

• Cross section: X section
• Dimension DIM1: 5 mm
• Thickness DIM2: 1.2 mm
• Dimension DIM3: 10 mm
• Thickness DIM4: 1.2 mm

• To create this cross section (Go>1D>Hyperbeam>Create>Standard section>Optistruct>Cross).
• The standard cross section shape will be created and enter the given dimensions data as shown in the below figure.

Hence, the cross-section has been created for rod, beam, bar element as per given data. Now these cross sections should be assigned to the particular property.

APPROACH:

a. Approach for Rod element:

• Created RBE2 cluster element for hole (a) by constraining translational as per given data.
• Created CROD element by connecting hole (a)
• CROD- Thin walled cross-section as per input.

b. Approach for Beam element:

• Created RBE3 cluster element for hole (b) by constraining all dof as per input data.
• Created CBEAM element by connecting hole (b)
• CROD- I cross-section as per input.

c. Approach for Bar element:

• Created RBE3 cluster element for hole c) by constraining only X and Y DOF as per input data.
• Created CBAR element by connecting hole (c)
• CROD- X cross-section as per input.

d and e. Apply the mass of magnitude 10 with the RBE2 link:

• Create RBE2 cluster element for hole (d and e) as per given data.
• Applied a mass of magnitude 10
• CMASS

f. Join the two components with spring elements:

• Spring elements are created at point (f) to join the brackets of given component.
• CELAS1

Finally select 1D detailed element representation to view the cross-section of bar, rod and beam element and select 2D detailed element representation to view the thickness of the midsurface.

CONCLUSION:

In this project, we have finally achieved the mesh and creation of 1D elements which has been successfully displayed as a result.

LEARNING OUTCOME:

• Learnt the concept of Auto Midsurface and Manual Midsurface.
• Understand the concept of 2D mesh and one more the concept of washer line.
• Learnt the concept and importance of 1D element like BAR, BEAM, ROD.