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REAR IMPACT HEAD DISPLACEMENT REDUCTION THROUGH THE APPLICATION OF STRAIN RATE HARDENING CUSHIONING MATERIALS
REAR IMPACT HEAD DISPLACEMENT REDUCTION THROUGH THE APPLICATION OF STRAIN RATE HARDENING CUSHIONING MATERIALS
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机译:通过应变率硬化缓冲材料的应用减少后部冲击头位移
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摘要
A head restraint for a seat includes a core support structure supporting a dual rate cushioning foam. The dual rate cushioning foam includes a dilatant material that changes from a first compression rate providing a first stiffness to a second compression rate providing a second stiffness in response to a strain rate in the dilatant material rising above a pre-defined limit. The first compression rate at the first stiffness provides a softer feel to the occupant for normal operation of the vehicle. The second compression rate at the second stiffness provides a stiffer resistance to resist the sudden rearward movement of the occupant's head in the event of a sudden rear impact.
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