Week - 3 Drop test Challenge

OBJECTIVE

To perform drop test analysis on the given meshed model .by providing a appropriated velocity and boundary conditions using ls dyna software and conclude the result.

GEOMETRY STUDY AND PROCEDURE .

1. Material creation.
2. section creation.
3. defining boundary conditions and specifying the initial velocity to cell phone.
4. creating contact definition between cell phone and rigid plate.
5. model termination time hasto be assigned.
6. data base binary D3PLOT,ASCII.
7. ploting reslts.

The .k file contanins two elements one is solid and another one is shell .the bottom portion plate is solid and it is floor. the upper most part is cell phone model and this is shell element we have to apply boundary contrained in such a way that the phone should fall on the plate with certain velocity and we have to observe the deformation of the cell phone . in this i applied rigid material mat20 and picewise linear plastic mat 24 material to the cell phone and am getting deformation and strain generation in both the plate and cell phone.

GIVEN MODEL

Material assigning.

here the phone is shell and rigid is solid section .the material we are using rigid material for MAT 20 and picewise linear plasticity (Non linear ) for phone MAT024.

MAT_RIGID MAT 20

• RO - 7.850E-09
• E- 2.100E+05.
• PR - 0.3000000.

MAT 24 picewise_linear_plasticity.

• RO- 7.850e-09.
• E- 2.100E+05.
• PR- 0.3000000.
• SIGY - 314.00000.
• ETAN -1.000e+04.
• FAil - 1.000e+21

SECTION CREATION.

creating the section id for solid and shell section for rigid and phone.

Bounday conditions

the rigid wall as SPC single point constant and giving velocity to the phone in -z direction.

boundary_spc_key has been created to fix the rigid plate edges from moving during the impact.

Initial Velocity.

creating the initial velocity click keyword managaer and select the velocity now give the velocity for the phone.creating the node set id for which the elements to be in velocity in the -ve Z direction so that the drop phonenomenon is taken under conditions.

contact creation

selecting the slave and master it is important that slave segment set or node type.

an Automatic_surface _to_surface has been created between the cell phone and rigid plate with cell phone being the slave and rigid plate taken as master.

• Control card select the termination for animation time for the model.

• create the output file by clicking the data base and select the binary d3plot

Result

• von mises stress

graph

Conclusion

all the keywords has been created right from scratch and model checked .the whole purpose of this challange is to make the user get familiarize with the gui to learn from the ls dyna name creating keywords and running the simulations.

link :https://drive.google.com/file/d/1_80DINR5IU4f6bsb4_A6NvRgeEZqswJQ/view?usp=sharing