NEON BIW SIDE CRASH ANALYSIS USING RADIOSS AS SOLVER
OBJECTIVE: To simulate the side crash analysis of the given neon model.
STEPS:
UNIT SYSTEM: During whole analysis, Kg KN mm ms was followed.
INTERFACES: Deleted already defined interfaces and created Type 7 global interface.
The properties for the Type 7 interface are:
Istf=4
Igap=3
Idel=2
Fscale= 0.8
Inacti = 6
Iform = 2
Stmin=1KN
RIGID WALL: Rigid wall is craeted with cylindrical cross section.
Diameter= 254mm
Dsearch= 1000
Friction = 0.1
INITIAL VELOCITY: Under BC manager, the initial velocity of 15.66mm/ms was assigned to all nodes of the neon car model. This velocity was given in Y direction.
ADDED MASS: The initial mass of the model was 166.308 Kg. 533.69Kg was added on the base of the car to reach the target weight of 700kg with the center of mass at the desired location.
NECESSARY ENGINE FILES:
Initial penetrations and intersection were removed before running the model.
The model checker in Hypercrash was run to remove warning and errors in the model.
SECTIONAL FORCES: To get sectional forces on two cross-members, the cross-section was created.
OUTPUT REQUESTS: In the output block nodes were created to get nodal velocity and intrusion on given locations.
INTRUSION
Tank at node 123362
Hinge pillar at node 123322
B pillar at node 123140
PEAK VELOCITY of the inner node of the door at node 337772
SIMULATION AND RESULTS:
CROSS MEMBER SECTIONAL FORCES
The maximum resultant force acting on the member is 2.35KN around 20 milliseconds. After 20milli seconds there deformation starts on the cross member. After 50 milliseconds, there is very little deformation and a sudden hike in cross-sectional force is seen.
INTRUSIONS: B-PILLAR
The relative displacement of node 123140
The initial distance between two nodes = 1302.06mm
After the collision, the distance between two nodes= 553.614mm
Intrusion= 748.5mm
INTRUSION: TANK
Intrusion at node 123362 = 1319.953-430.582= 889.372mm
INTRUSION: HINGE PILLAR
Intrusion at node 123322= 1308.596-814.024=494.572mm
PEAK VELOCITY OF INNER NODE(337772)
The peak velocity of the inner node is around 16m/s.
ENERGY PLOT AND ERRORS:
Max\'s energy was -1.8%. Negative energy error indicates energy has been dissipated from the system.
The mass error of up to 2% is acceptable. In our case, it was less than 1%. Mass error is due to the low time step of a few nodes. On failed element, artificial masses are added to increase the time step to 0.0005m seconds.
The elapsed time for the simulation is 7629 seconds.
LINK: