Assignment 5-RADIOSS Interfaces & Study of Effect of Notches Challenge

AIM

To mesh the given bumper model with 6mm size and run the crash tube model by using different types of contact interfaces.

Objective:

1. Run the crash tube model as it is.
2. Change the Inacti=6 and run.
3. Create the type 11 contact and run.
4. Remove both notches and remove boundary condition on rigid body node then run.
5. Create a new notch in the middle, select the whole section and run.
6. Create a new notch with nodes only from opposing 2 faces and run.

And also plotting Rwal forces, contact forces, energy plots, etc.

Interface penalty Method:

Interface Penalty Method:

• The penalty method treats the behavior between slave nodes and master segments as springs that generate resistive forces as a function of penetration.
• Here the interfaces are governed by the penalty met
• When the parts come into contact, The stave node tries to penetrate the mid surface.
• The solver introduces the 1D spring element once the slave node penetrates the gap.
• The spring stiffness is automatically computed according to the material and property of both the master segment and slave node

Interface Type 7: Nodes to Surface Contact

• It is a general-purpose interface and can simulate all types of impact between a set of nodes and a master surface.
• Non oriented and slave nodes can belong to the master surface, Hence auto impact is possible
• Automatic node to surface contact interface using penalty method with variable
• A gap is defined around the master segment and the slave
• The contact gap can be constant or variable.
• Resistive forces are applied to keep slave nodes out of the contact
• The interface time step is computed to ensure stability

Interface Type 11: (Edge to Edge Contact)

• Type 11 is similar to Type 7
• This interface simulates the impact between edge to Edge or A line can be a beam or truss element or a shell edge or spring element. In association with interface Type 7, interface Type 11 solves the locking cases.
• Defined by identifying master and slave lines(edges)
• Impacts occur between a master and a slave line A slave line can impact one or more master lines. A line can belong to the master and the slave side. This allows self-impact.
• Works similar to Type 7 in terms of Penalty formulation, Gap definition,d search method.
• Uses complicated mathematical algorithms; therefore, it is strongly advised to use them only when necessary. A huge interface Type 11 can slow down the

Below images represent the meshing and process of bumper: