Week - 3 Drop test Challenge

AIM: To Create a complete input deck filr from scratch with all required cards for drop test simulation

STEPS:

Create Material and Section:-

• Open the model in LS Prepost which contains only mesh
  
• From the above image we can see there are no sufficient cards to carry on the simulation
• Now we have to create required cards
• First look at the number of parts and delete the unwanted parts
• Now in this case i will be deleting the solid elements of floor, instead i will keep only the shell element of floor
• Rename the two parts as mobile and Floor
• Now we have to create the material id and Section ID for both the parts
• Go to keyword manager>MAT
• Create Aluminium material for mobile like shown below
  
• Create a rigid material for Floor
  
• Next create section for both parts go to>Keywordmanager>Section
• Create shell section of 1mm thickness for Floor
• Create solid section for Mobile
• Assign the respective material and Section id for both the parts

Boundary Conditions:

• Next we have create a boundary condition for parts
• Floor has to be fixed with respect to all directions
  
• Constraint the top of the mobile in all direction except in global Z direction
  

Initial velocity

• Create a initial velocity card , it is determined by equation v=`root ()2gh`
• let us assume the height as 1.8m =1800mm
• By using the above equation velocity is equal to 5.94mm/ms in negative z direction
  

Contact Condition

• We will be using automatic surface to surface contact between the parts
• let us consider the floor as master and Mobile as slave
  

Control Cards:

• To compute Hourglass energy, Sliding energy and stonewall energy we will be usinf *control_energies card
  
• Let us stop the simulation for 5ms using termination card like shown in below image
  
• Note down the result for every 0.1ms(time step)
  
• From the above image we can see the time step as 0.1ms for binaryd3plot
• Similarly get result from ASCII for GLSTAT,MATSUM,SLEOUT,ELOUT

Run the simulation:

• Now we have all required coards
• Save the keyword file and run the simulation
• Like shown in below image we should get normal termination
  

Binary plot:

• Open Binary plot file to see post processinf results
  

CONCLUSION:

• The required cards for simulation from scratch is done
• Got appropriate results for the given input
• Learnt how to create basic cards for simulation