1 Analyzing Wheel Bolt Pretension with Ansys AIM // Wheel separations are a serious concern, with rear wheel separation presenting the greatest risk because a vehicle that loses a rear wheel is more likely to lose control and rollover. Wheel separations are also dangerous to other vehicles since when a vehicle separates it is often launched into the air when the weight of the vehicle is suddenly removed. The largest cluster of incidents came in 1991 when a series of wheel separations resulted in seven deaths. At that time, the United States National Transportation Safety Board (NTSB) studied the problem and concluded that about 750 to 1,050 wheel separations occurred each year. This number is probably on the low side since wheel separations that do not cause an injury often go unre

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