High Performance Polymers, 2nd Edition

13: ARAMIDS 309

There are standard test methods for testing the

impact strength under ordinary conditions [66,67]. In

addition, there isan ISO Standard with respectto bullet

resistance of protective clothing [68], but remarkably

there is no ASTM Standard with respect to this topic.

In classical ballistic tests, a projectile is shot at a sta-

tionary target that consists of the material to be tested.

The residual kinetic energies are studied. A recently

developed technique for lightweight materials uses the

reverse ballistic impact. In contrast to the classical

tests, the target is moving and the projectile is a rest

[69]. Nitrogen from a commercially compressed gas

bottle can be used as acceleration gas. Velocities of

up to 400 m s

−1

can be achieved, depending ...