Impact (mechanics)

The deceleration causes a high force or shock, applied over a short time period.

A high-velocity collision (an impact) does not provide sufficient time for these deformations and vibrations to occur.

Since most materials are weaker in tension than compression, this is the zone where cracks tend to form and grow.

A pile driver achieves the same end, although on a much larger scale, the method being commonly used during civil construction projects to make building and bridge foundations.

Much design effort is made to improve the impact resistance of cars so as to minimize user injury.

Parts of the body shell outside the cell are designed to crumple progressively, absorbing most of the kinetic energy which must be dissipated by the impact.

Various impact test are used to assess the effects of high loading, both on products and standard slabs of material.

Protective packaging and cushioning help reduce the peak acceleration by extending the duration of the shock or impact.