Week 4-1D Element Creation Challenge

Objective:-

• To create mid-surface for the given modal
• to do a 2d mesh on it with an element size of 5 units
• To create 1d elements on it
• Such as Bar, Rod, Beam with the given cross-section
• to apply a mass of 10 units after creating an RBE2 link
• To join the two components using a spring 1d element

Introduction:-

• In this modal, we will create a mid surfacing then mesh it using the 2d auto meshing with a given element size
• Add 1d elements to it
• This is a symmetric modal that we were given.

Theory:-

• In this modal we first create the Mid surfacing by the following procedure:-
  • In Geometry → mid surfacing → Auto mid surf
  • Mid surfacing helps to convert the 3d modal to a 2d modal with less no. of nodes and less complex calculation
  • we can mostly use the mid surf only for the symmetric modal.
  • we created new Components for mid surfacings such as Bracket_1 and Bracket_2
  • and then we deleted the left component after moving those new mid surf component to a newly created component
  • to move the component from one to another we used the Organise tool from "tools"

• Then we created material for the component as "steel"
  • and defined:-
  • card image as MAT1
  • E- youngs modulus of elasticity
  • NU- Poisons ratio
  • RHO- Density
• Then we created properties for each of the components as "Braclet_1 and Bracket_2":-
  • with:-
  • Thickness(T):- 2.0
  • Card image:- PSHELL
  • Material steel

• Then we assigned these properties to the two components
• web added washers split of 5mm offset from Quick edit
• Then we did a 2d auto mesh with an element size of 8.
• Now we created RBE2 and RBE3 links
  • after that, we created 1D elements on it such as
    • Bar, Rod, Beam

• After this, we went to "Hyperbeam" to assign cross-section to these 1d elements(bar, rod, beam)
• there we selected an "optistruct" solver to assign the required cross-section such as
  • Box for Rod
  • I for beam
  • Cross for bar
  • with the given dimensions

For ROD

FOR BEAM

FOR BAR

• Then we created a mass of 10 units on an RBE2 link

• Then we Created a spring between the given two components

• Now we created properties for all the 1d elements because they all have different properties
  • first, we created a property for the Rod
  • as by choosing the card image as PROD
  • and beam section as the created beam section through the Hyperbeam in Optistruct solver
  • similarly for the bar and the Beam
  • then we updated the properties of Bar, Rod, and Beam from 1d
• then we created the property for the spring element where we used the card image as PELAS

property of bar

property of rod:-

beam property:-

Spring property:-

Conclusion:-

• we learnt how to create mid surf
• we learnt how to move components
• we learnt how to create properties, materials and components and use different solvers and card image
• we learnt to assign properties to the components or elements
• we learnt how to create 1d elements such as rod bar beam spring and mass
• we learnt the difference between RBE2 and RBE3 links and elements
• we learnt how to create the cross-section of the 1d elements(rod, bar, beam) and how to assign them in there properties.