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Reverse impact testing

Published: 6 October 2017

In airplane engines there are several structural parts that require high containment capability. The requirement is that the structure surrounding the rotating parts of the motor should prevent solving parts, e.g. turbine wovels in the event of a fracture, penetrate and cause damage to the surrounding body.

As part of the dimensioning of containment structures, full scale testing is used. However, these are very costly, so more cost effective methods are preferred. One way to evaluate is to shoot projectiles against sheet samples of the containment material. Another attractive approach is to reverse the concepts and shoot a smaller sheet sample against a projectile attached to a longer rod, ie. Reverse impact testing. The strength of letting the sheet sample slide onto the projectile is that the force at the impact can be measured by detecting the elastic pressure wave generated in the subsequent rod. By utilizing induction heating, the sheet sample can also be heated to temperatures occurring in airplane engines