Challenge

Car Crash Analysis

PPrathamesh Patil28 Feb 2022

DESIGN

AIM:

To perform explicit analysis of Car crash simulation and evaluate the stress and deformation results.

OBJECTIVES OF THE PROJECT:

To assign Stainless steel NL for the body and structural steel for the wall.
To define Mesh method and Edge sizing.
To define Velocity and fixed support.
To evaluate the stress, deformation and strain in the work piece.

PROCEDURE:

CASE 1:
OPEN WORKBENCH21 > NEW PROJECT > EXPLICIT DYNAMICS.
This will start a new explicit dynamics project.
Rename the project as Car crash simulation.
Go to ENGINEERING DATA > EXPLICIT MATERIALS > STAINLESS STEEL NL > ADD.
Go to GEOMETRY > IMPORT > MODEL.
Then double click on Geometry. This will open the Spaceclaim.
In Space claim check the model for any dents or irregularities.
The geometry looks good, exit the Spaceclaim.
Then double click on Model. This will open Mechanical module.
Now, rename the geometry as wall and body.
Then assign stainless steel NL to the car body and structural steel to the wall.
Go to GEOMETRY > CAR BODY > THICKNESS = 0.3MM > PARAMETER STUDY.
Go to Contacts and DELETE ALL CONTACTS.
Go to MODEL > INSERT > SYMMETRY REGION > GEOMETRY = WALL FACE.
Similarly, define SYMMETRY REGION > GEOMETRY REGION > CAR BODY EDGES.
MESH > INSERT > METHOD > GEOMETRY = WALL BODY > METHOD = TETRAHEDRON.
MESH > INSERT > FACE SIZING > GEOMETRY = CAR BODY FACES WHICH DO NOT COME IN CONTACT > ELEMENT SIZE = 175MM.
Now, MESH > GENERATE MESH.
The mesh will be generated on the model.
Then go to STATIC STRUCTURAL > ANALYIS SETTINGS > NO OF STEPS = 1 > END TIME = 1E-3 > MAXIMUM ENERGY ERROR = 0.1.
Go to EXPLICIT DYNAMICS > INSERT > DISPLACEMENT > GEOMETRY = WALL FACE > Z COMPONENT = 500MM.
Go to EXPLICIT DYNAMICS > INSERT > FIXED SUPPORT > GEOMETRY = CAR BODY FACES WHICH DO NOT COME IN CONTACT.
Then, go to SOLUTION > INSERT > STRESS > STRAIN > DEFORMATION.
This will set the output results.
Then SOLUTION > SOLVE.
Then after solution is obtained go to PARAMETER STUDY > INSERT > INPUT PARAMETERS AS CAR BODY THICKNESS > OUTPUT RESULTS AS DEFORMATION AND STRESS RESULTS > RETAIN POINTS > UPDATE ALL DESIGN POINTS.
The software will solve for the design points and evaluate the results for the different thickness.