Week - 3 Drop test Challenge

OBJECTIVE:

To get a feel of creating an input deck from scratch and creating results with following situations, The phone should bounce back in the same direction after the impact and Bounce back along with rotation after the impact.

PROCEDURE:

STEP 1: OPEN THE .k FILE.

opened file

STEP 2: CREATING KETWORDS.

go to model and part > keyword manager

Here all the keywords have already created. We can see from the snip.

here, the cell phone and rigid wall are made up with solid elements. *CONTACT_AUTOMATIC_SURFACE TO_SURFACE is used here. In *CONTROL, only *CONTROL_TERMINATION is used. The end time is 30 milliseconds. We want result file, so In *DATABASE , the ASCII and BINARY_D3PLOT are added. For cell phone 10 mm/ms velocity given. The direction of velocity is negative z-axis. This value is given in *INITIAL_VELOCITY.

For cell phone we are used *MAT_PIECEWISE_LINEAR_PLASTICITY(024), and for rigid wall we are used *MAT_RIGID(020).

STEP 3: RUNNING THE SIMULATION.

For running the simulation the .k file transferred to LSR. After running we got result file.

STEP 4: OPEN THE D3PLOT FILE.

STEP 5: EVALUATING THE RESULTS.

go to post > fringe component

here we can see Von Mises stress ,x-stress, y-stress, z-stress etc...

For getting ASCII output files, go to post > ASCII.

here lot of results are available. Here * represents those results are available.

GLSTAT- It represents kinetic, Internal, Total energies of the model.

GLSTAT KINETIC ENERGY OF THE MODEL

glstat kinetic, internal, total energies.

MATSUM- It represents what are the material energies because of the deformation and their acceleration, what are the energies that are created for each part recorded.

Internal, kinetic, hourglass energy of cell phone

Internal, kinetic, hourglass energies of rigid wall.

RCFORC- It records the contact forces, if there is a contact between two parts how the force has been changed between them.

x,y,z forces of slave

x,y,z forces of master

SLEOUT- It records the sliding energy due to contact.

slave, master, frictional energies .contact_suface_to_surface

CONCLUSION:

We are giving initial velocity to the cell phone ie, 10 mm/ms in the negative z-direction. The impact happens in a short amount of time. So upto the point of impact where happening we can see that kinetic energy to be flat. When impact happens imediately kinetic energy decreases. At the same time Internal energy should increase. Why because internal energy is work done on the system + strain energy. The moment it crashes lot of stress and strain will get generated in every part. So all those will contribute to internal energy.

THANK YOU

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