Drop test Challenge

OBJECTIVE: In this challenge .k file was provided in the well-meshed format. We have to perform a drop test analysis on the given meshed model. by providing an appropriate velocity and boundary conditions.

Explanation of model provided.

The .k file contains two elements one is solid and another one is a shell, The bottom portion plate is solid and it is the floor. Also, the uppermost part is a cell phone model and this is a shell element, we have to apply the boundary constrained in such a way that the phone should fall on the plate with a certain velocity, And we have to observe the deformation on the cell phone.

But in this case, I applied elastic material to the plate and piecewise linear plastic material to cell phone, and a am getting the deformation and strain generation in both the plate and cell phone.

Procedure for pre-processing of a model.

1) At first, I applied boundary SPC (single point constraint) to the plate sided node so that it can not move during the fall of the cell phone on it).

2) Then by going in the initial tab I applied velocity to cell phone,10000 mm/s in the negative z-direction so that the drop phenomenon is taken under consideration.

3) After that material card was created, there are two material models,first one is elastic and the second one is linear piecewise plastic material elastic material input data:-

mat-24 material data input:-

Material Stress-strain Curve

4) After the material definition, there are two elements (shell and solid ) for these two I defined section shell and section solid

5) After defining the sections, by executing the part tab in the key-word manager assigning of material id's and section id's was done.

6) After that, the automatic surface to surface contact was defined between the plate and cell phone with the master as a plate and slave as a cellphone.

7)control termination card wad defined with the analysis run time of 0.5 milli sec, After that the database output parameter file was included such that binary d3plot, Also ASCII options

with the result capturing time of 0.01 each iteration.

Results extracted:-

EFFECTIVE_VON_MICES

EFFECTIVE_Z_DIRECTIONAL_STRESS

INTERNAL, KINETIC, AND TOTAL ENERGIES

Conclusion:

This activity was a trial simulation for the drop test. It helped us understand the key steps involved in building a simulation keyword file. It gets us familiar with the tool and the different steps involved.