Characterization of materials could be determined at low-middle deformation rates. The main measurable properties of a material as ductility or toughness can be calculated from the amount of absorbed energy during the impact test specimen fails. These measurements are important for orienting the design works at the start up.
Before applying composite materials as vehicle, building or body armour, impact tests are carried out on standard specimen and small scale specimen of composite materials and impact absorption capabilities are researched without executing real bullet tests.
Also the real model is being developed by designing the finite element models of the impact specimen. Resistance values of the materials like wheel rims during dynamic loads are obtained and these values are compared with materials endurance limits so design mistakes can be adjusted.
· ASTM D-3763: Hard plastic perforation
· ISO 6603-2: Hard plastic perforation
· ASTM D-256: Charpy
· ASTM D-6110: Izod
· ISO 179: Charpy
· ISO 180: Izod
· ASTM E-23: Charpy and Izod
· NASA ST-1: Damage resistance of composites
Instron Dynatup 9250 HV (velocity accelerator system) impact test machine has a capability of 945 J and maximum impact velocity of 20 m/s by the help of the spring accelerator. By the other impact test machine Instron Dynatup 8150, energy values about materials can be measured during free fall of all the energy onto the specimen. This machine has a velocity of 7 m/s and maximum impact energy value is 27116 J.