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Background
Background
Head Restraint is a part that provided to limit the rearward motion of the driver’s head and must be strong enough to withstand a minimum force of 1) 900 N applied in a rearward direction and 2) 300 N applied in a lateral or vertical direction.
The head restraint can be separated into two parts: the padding and the mounting, attached together by fastening 4 sets of bolt and screw (bolt heads are permanently attached to padding part). The padding must be made of an energy-absorbing material, typically energy-absorbing foam. Energy-absorbing materials typically have complex deformation behavior and nonlinear stress-strain relationships that are difficult to model using finite element analysis. Therefore, it is common practice to simplify the modeling of energy-absorbing materials by excluding them from the analysis.
In conclusion, we indicates that the valid size of head restraint padding is sufficient to withstand loads. Consequently, we conducted further calculations and finite element analysis on the mounting part alone, without including the energy-absorbing material. This approach allowed us to focus on the strength and stability of the mounting part and ensure that it is capable of transferring loads without failure.
Related Regulations
Related Regulations
T.2.8 Head Restraint
T.2.8.1 A Head Restraint must be provided to limit the rearward motion of the driver’s head.
T.2.8.2 The Head Restraint must be vertical or near vertical in side view.
T.2.8.3 All material and structure of the Head Restraint must be inside one or both of:
a. Rollover Protection Envelope F.1.13
b. Head Restraint Protection (if used) F.5.10
T.2.8.4 The Head Restraint, attachment and mounting must be strong enough to withstand a minimum force of:
a. 900 N applied in a rearward direction
b. 300 N applied in a lateral or vertical direction
T.2.8.5 For all drivers, the Head Restraint must be located and adjusted where:
a. the Head Restraint is no more than 25 mm away from the back of the driver’s helmet, with the driver in their normal driving position.
b. The contact point of the back of the driver’s helmet on the Head Restraint is no less than 50 mm from any edge of the Head Restraint.
T.2.8.6 The Head Restraint padding must:
a. Be an energy absorbing material that is one of the two:
Meets SFI Spec 45.2
CONFOR CF45 (Blue) or CONFOR CF45M (Blue) FIA Technical List No 17
b. Have a minimum thickness of 38 mm
c. Have a minimum width of 15 cm
d. Meet one of the following:
minimum area of 235 cm2 AND minimum total height adjustment of 17.5 cm
minimum height of 28 cm
e. Be covered with a thin, flexible material that contains a ~20 mm diameter inspection hole in a surface other than the front surface
Our design of Head Restraint Padding
Our design of Head Restraint Padding
Material: CONFOR CF45
Type: Non-adjustable padding
Sizing: Thickness = 40 mm (min 38 mm)
Width = 160 mm (min 150 mm)
Height = 290 mm (min 280 mm)
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