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Background
Background
As mentioned before, the mounting of the head restraint must be designed to withstand high loads and prevent unwanted movement of the head restraint during an impact. Finite element analysis (FEA) can be used to evaluate the strength of the mounting system and optimize the design for improved safety. The analysis can consider various loading conditions, including frontal, bump, and side impacts, to ensure that the head restraint remains secure in all situations.
details
details
made of sheet steel, bended, and welded to Main hoop structure
4 of 6 mm holes for attaches the padding
TArget
TArget
is capable of transferring following loads without failure (with (S.F. ≥ 1.2):
900 N applied in a rearward direction
300 N applied in a lateral or vertical direction
weight is not exceed 750 grams
2D-FBD of head restraint mounting: Frontal impact
2D-FBD of head restraint mounting: Frontal impact
2D-FBD of head restraint mounting: Lateral load
2D-FBD of head restraint mounting: Lateral load
2D-FBD of head restraint mounting: vertical load
2D-FBD of head restraint mounting: vertical load
FEA of head restraint mounting: Frontal impact
FEA of head restraint mounting: Frontal impact
Model: 2 mm-thick of simple bended steel sheet
The results obtained from the finite element analysis (FEA) demonstrate that the maximum stress occurred in the frontal impact load case, with an equivalent stress of 197.73 MPa (S.F. = 1.2677), which satisfy the minimum safety factor requirement but exceed the weight limit with value of 871.76 g.
Mesh setting
Boundary Conditions
Stress plot
FEA of head restraint mounting: Frontal impact
FEA of head restraint mounting: Frontal impact
Model: 1 mm-thick of flanged bended steel sheet
The improvement was achieved by reducing the material thickness by 1 mm. To maintain equivalent stiffness, flanges were added to the top and bottom edges of the part, like in a C-beam structure.
The results obtained from the finite element analysis (FEA) demonstrate that the maximum stress occurred in the frontal impact load case, with an equivalent stress of 202.76 MPa (S.F. = 1.233), which satisfy the minimum safety factor requirement and still equivalent to the first model and not exceed the weight limit with value of 579.61 g.
Mesh setting
Boundary Conditions
Stress plot
FEA of head restraint mounting: Lateral Load
FEA of head restraint mounting: Lateral Load
Model: 1 mm-thick of flanged bended steel sheet
The results obtained from the finite element analysis (FEA) demonstrate that the maximum stress occurred in lateral load case, with an equivalent stress of 53.945 MPa (S.F. = 4.6343), which satisfy the minimum safety factor requirement.
Mesh setting
Boundary Conditions
Stress plot
FEA of head restraint mounting: Vertical Load
FEA of head restraint mounting: Vertical Load
Model: 1 mm-thick of flanged bended steel sheet
The results obtained from the finite element analysis (FEA) demonstrate that the maximum stress occurred in vertical load case, with an equivalent stress of 26.526 MPa (S.F. = 9.4246), which satisfy the minimum safety factor requirement.
Mesh setting
Boundary Conditions
Stress plot
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