Assignment 5

OBJECTIVE

1. Create the mesh for bumper assembly,mesh size should be 6mm.
2. To run the crash tube model for different cases and to observe the changes

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

BUMPER MESHING

Model setup

Here the given model is loaded in hypermesh and geometry is cleaned and the mesh is been created with the target size of 6mm

CRASHTUBE

CASE1(With notch type7)

• The given model is run as it is in the hypermesh and .out file is verified for error in energy and mass

the maximum energy error observed in this case is around -4.6%.

• Then the contact forces and the displacement is observed with the help of contour by .h3d file .

The maximum contact forces is obtained at Node 93.781kN @ node 1303 and the minimum contact force is observed in node 765

• The Energies were ploted in hypergraph 2d with T01 file

From the plot we can see that the internal energy(4250mj) and the R wall force(1300Kn) reaches max value at around 26ms

CASE2(With notch type7)

• The given model is imported in hypermesh and the Inacti is given as 6 and the model is saved in a different path .
• .out file is verified for error in energy and mass
• the maximum energy error observed in this case is around -4.6% and the mass error remains 0 throughtout the simulation whhich is almost similar to the case 1

• Then the contact forces and the displacement is observed with the help of contour by .h3d file .

• The Energies were ploted in hypergraph 2d with T01 file

From the plot we can see that the internal energy(4250mj) reaches and the R wall force(1300Kn)max is identical for both case 1 and 2

CASE3(With notch type11)

• The model is imported and from tsolver browser the interface type is change to type 11 and the model is runned

• .out file is verified for error in energy and mass
• the maximum energy error observed in this case is around -2.7% and the mass error remains 0

• Then the contact forces and the displacement is observed with the help of contour by .h3d file .

here we can observe the force is 810.9Kn which is higher than the above two cases.

• The Energies were ploted in hypergraph 2d with T01 file

In this case the R wall force reaches its peak value of 1580Kn at 25.5ms which is higher than the above two case

CASE 4(Without Notch type7)

• In this case the the given model is imported and the notches were removed with align tool and then model is runned

• .out file is verified for error in energy and mass
• the maximum energy error observed in this case is around -3.7% and the mass error remains 0

• then the contact forces and the displacement is observed with the help of contour by .h3d file .
• 
• MAx contact force is about 57.26Kn which is low on comparing case 1 and 2

• The Energies were ploted in hypergraph 2d with T01 file

In this case the R wall force reaches its peak value of 1200Kn at 25.5ms which is lower than the above three case

CASE 5 (NOTCH AT MID)

• Here the model is imported and the notch is created at the mid using translate option and then the model is saved in a different path

• .out file is verified for error in energy and mass
• the maximum energy error observed in this case is around -3.7% and the mass error remains 0

• Then the contact forces and the displacement is observed with the help of contour by .h3d file .

• MAx contact force is about 109. 4Kn

• The Energies were ploted in hypergraph 2d with T01 file

In this case the R wall force reaches its peak value of 1400Kn at 27ms

CASE 6 (NOTCH AT OPP FACES)

• Here the model is imported and the notch is created at the opposite faces using translate option and then the model is saved in a different path

• .out file is verified for error in energy and mass
• the maximum energy error observed in this case is around -3.7% and the mass error remains 0

• Then the contact forces and the displacement is observed with the help of contour by .h3d file .

• MAx contact force is about 85.65Kn

• The Energies were ploted in hypergraph 2d with T01 file

In this case the R wall force reaches its peak value of 1300Kn at 27ms

COMPARISON AND CONCLUSION

from this challenge i have learnt about the interfaces and types of interface and their effect through the plot . the simulation of the given crash tube model for different types of interface and notch and how it affects the defomation and the r wall forces