Week 11 Car Crash simulation

#11 Week Assignment- Introduction to Ansys Workbench

Aim:To perform a parametric study using 3 different values of thickness for the car body.

Objective: By varying the thickness for 3 different values the simulation has to be run and analyze the difference in the output parameters.

Case Setup:

• Import the geometry into the mechanical module in the Ansys Workbench under Explicit Dynamics Structural Analysis.
• Rename the geometries based on their structure.
• Assign material for the car body as stainless steel.

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• Insert the symmetry in the geometry and select the face and and edges of the geometry.

Meshing:

• Create the method under mesh and select the car body and select the type as triangles.

• Insert sizing and select the faces as below and insert a sizing of 175mm.

• Insert the method select the wall and type as tetrahedrons.

• Click on generate and the mesh will be generated as below.

• Insert a fixed support under explicit dynamics and select the faces as below, to fix them for the simulation.

• Insert a displacement to the face of wall for 500mm in the Z-Direction.

• Goto Analysis Settings and set the end time to 0.01.
• List the output parameters to solve.
• Click on solve.

CASE-1: (Thickness of 0.7 mm)

Total Deformation:

Equivalent Stress:

CASE-2: (Thickness of 1.1mm)

Total Deformation:

Equivalent Stress:

CASE-3: (Thickness of 1.5mm)

Total Deformation:

Equivalent Stress:

Results: The results of all the 3 cases of car body simulation with varying thicknesses are tabulated below,

	CASE-1(0.7mm)	CASE-2(1.1mm)	CASE-3(1.5mm)
Total Deformation (mm)	1050.7	1038.9	1032.1
Directional Deformation(Y) (mm)	87.92	83.43	86.69
Equivalent Stress (MPa)	11599	11565	11520
Equivalent Strain (mm/mm)	0.059	0.059	0.058

Conclusion: From the car crash simulation using three different thicknesses we obtained varying results for each. There is only a minor change in the values observed. As the thickness improves the stress, strain and deformation values get decreased.