Week-7 Head Impact
Introduction-
Head Impact test is considered as very important aspect in pedestrian Safety in vehicle safety engineering. this test and simulation must be done by all vehicles releasing in market based vehicle safety regulatory body(EuroNCAP). Head impact test effect or injury is measured in HIC(Head impact collision), it does'nt mean high Hic value causes more damage, injuries are given or indicated by grading. this grading is given by Regulatory body based on observation of various AV and insurance claims.
Objective-
The Aim of this challenge is to calculate HIC value by doing simulation of given files
1) Simple head vs rigid wall
2) Pedestrian Headform vs rigid wall
3) Pedestrian Headform vs Meshed Hood
the given model is to be simulated at velocity of 7.8mm/ms
Procedure-
SIMPLE HEAD VS RIGID WALL
1) the given model is simple head made of shell elements
2) a rigid wall is created by using create entity by distance of 10 mm
3) velocity is given as 7.84mm/ms in z direction
4)material properties are given in MAT_ELASTIC(steel)
5)section shell is given with thickness of 1.5 mm
6) contact is given as automatic_single_surface
7) database is given as 0.1 for both d3plot and Ascii(GLSTAT,NODOUT), historynode was selected byDatabase_history_node
8) control termination is given as 5
the .K file is solved
HIC-
Pedestrian Headform vs rigid wall
1) the given file has pedestrian headform which consists of four parts with standard mat properties given by skill lync
2) a rigid wall is created at offset of 10mm in zirection of headform
3) the head form is rotated in 45 degrees by using include_transform(input in y axis)
4) the velocity is given in direction of x and z of -7.84mm/ms
5) database option is given(D3plot,Ascii(Nodout,Glstat)
6) contact option is already given by skill lync
7) control termination is given as 5
the .k file is solved
HIC-
GLSTAT
SIMULATION(V-M)
Pedestrian Headform vs Meshed Hood
1) this Project is industry oriented, according to EuroNcap regulation every car released in market must satisfy this test regulations
2) the meshed hood file is included in Pedestrian head form file by Include_transformation option
3) the material properties are given for head form by default, the properties for hood are given(AL properties) MAT_024
4) velocity is given for headform as -7.84mm/ms in z and x direction, section shell is given with thickness of 1.5
5) database option is given(D3plot,Ascii(Nodout,Glstat))
6) contact option is already given by skill lync, contact option is given for Contact_automatic_singlesurface slave as meshed hood
7) control termination is given as 5
HIC-
GLSTAT
SIMULATION(V-M)
Conclusion-
the Head impact simulation is done in all three cases.
as per given instruction the simulation is started with emabarssingly simple model and boundary condition in first case vs rigid wall, deformation is very simple.
In case 2 the given model is pedestrain headform is used for simulation vs rigid wall, the deformation of pedestrain headform is high compared to simple head model.
In case 3 in this real life scenario is simulated, the hood is deformed against pedestrain headform. the HIC value is low comapared to other cases