Quasi-Static test requirement

Seat and Seat-Belt Anchorage Point Tests

--> If the lower inner anchorage point is mounted at the seat, which usually is the case for the seat –belt latch, the seat and the seat-belt anchorage points are tested simultaneously.

--> By using rigid body blocks, the pulling force is applied equally to each anchorage point (The test is done in accordance with FMVSS 210 and ECE R14).


--> For each occupant seat, the resisting force should be greater than 14 000 N. The upper anchorage point with the variable height adjustment and the latch at the seat require special attention.

For example, the reinforcement plate at the B-pillar should not be stiff to prevent the outer B-pillar metal from being cut.

The belt latch at the seat also is important because the forces are transmitted via movable metal parts to the stiffer portion of the underbody or the vehicle middle tunnel.

The reason for this is that in a standard seat design, the seat cannot absorb the high forces from the seat-belt anchorage points. The seat itself must resist more than 20g over a period of more than 30ms. To transmit the force to the middle tunnel, a serrated seat rail is used.

Because of the loading during the accident, the vertical component of the seat-belt pulling force snapped the seat-belt anchorage point firmly into this special design element. Figure 19 shows the design of such a solution (serrated strip).

Seats in which the upper anchorage point is mounted at the seat back must have reinforcements installed in the seat back to absorb the forces and moments.

This often requires more weight and costs, and thus such a solution is installed only in special models such as convertibles.

by ahmad faris salihin bin alias


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