Week 4-1D Element Creation Challenge

Objective: Mesh the given component with the size of 5 units and create 1D elements on the following component with given cross-section and DOF

Procedure:

• Open HyperMesh and set user profile as Optistruct
• Import the geometry (.IGS) into Hypermesh

• Here I hide the lines component and change the color of the other two components for visualization purpose

• Extract the mid surface of the model, as this is constant thickness throughout so go with auto mid surface extraction (geometry -> mid surface)
• Create two more components (Mid surface_body_0 & Mid surface_body_1) for mid surfaces

• Before extracting, change the result into the current component in extraction options then extract the particular body

• After extracting and hiding the solid geometry it looks like this

• Add a washer split of 5 units to the holes
• Geometry -> Quick edit -> washer split -> select the lines (offset value: 5 units)

• Now your component is ready for mesh
• Press F12 -> select the particular component surfaces and mesh with an element size of 5 units in the particular component

• Remove trias in washer areas

• Check any trias is there in fillet region or not
• If not mesh the other component
• After completing the meshing to both the components, it look like this

• Now we need to add rigid elements at the areas (a,b,c,d,e,f) with different DOF’s and 1D Elements

Position	Constraints	Element
		Type	Cross sectional area
a	Translational DOF should be Constrained with RBE2 link	Rod Element	Box: a= 12 mm,b = 10 mm,t = 0.75 mm
b	All DOF should be constrained with RBE3 link	Beam Element	I Section: a= 8 mm, b= 10 mm, c= 8.5 mm, t1= 0.75 mm, t2= 0.6 mm, t3=0.6 mm
c	Constrain only x and y DOFs With RBE3 link	Bar Element	X section: Dimension DIM1= 5 mm Thickness DIM2= 1.2 mm Dimension DIM3= 10 mm Thickness DIM4= 1.2mm
d & e	RBE2 Link	Mass	10 units
f	------	Spring	--------

• Create a component for rigids and add all rigid elements in that component
• For RBE2 elements go to 1D -> rigids -> select the nodes on the washer area
• For RBE3 go to 1D -> RBE3

• Now create different components for mass, spring, Rod, Beam, Bar elements

• Add mass of magnitude 10 at d & e places
• Goto 1D -> masses -> select node and enter the magnitude of 10 units

• Add spring at f location
• Goto 1D -> springs

• Now create the cross-sections for Rod, Beam, Bar elements
• Goto 1D -> HyperBeam -> choose hyperbeam in standard section library

Input dimensions given in the problem

• To define X cross-section choose optistruct in the standard section library

• Input the dimensions given in the problem

• After defining the cross-sections, we need to define material and property
• Material we can add default one (Steel)

Property:

• Property can be defined individually for each component (2 mid surface bodies and Rod, Beam, Bar elements)

For components:

• Material as steel, Card Image as PSHELL, and thickness as 5mm

• Now define the properties for Rod, Beam, Bar elements

• Add mid surface property to the mid surface components

• Add Rod, Beam, Bar elements properties to the respective components

• Now define the Rod, Beam, Bar elements positions in the bracket as per the given question
• Goto 1D -> Rod -> select the nodes to add rod element (Element type CROD and select the property)
• Choose current component as Rod

• Goto 1D -> bars -> pick nodes, element type and property to add beam element

• Goto 1D -> bars -> pick nodes, element type and property to add bar element

• Now to visualize 1D Elements in 3D Mode
• Goto 1D Detailed Representation
• 

Final Visualization: