The hull of a personal watercraft, as shown, more commonly called a jet ski, is subject to wave-impact damage as it slams across the water when in use - Leaving Cert Engineering - Question a - 2020

To assess the impact resistance of a material, we can utilize two widely recognized tests: the Izod test and the Charpy test.

1. Izod Test:

• The specimen is notched and positioned vertically, clamped at one end.
• A pendulum hammer swings to strike the test specimen, delivering a specific energy of 167 joules.
• The energy absorbed by the specimen during the fracture will be measured to determine its toughness.
• The diagram illustrates the apparatus arrangement: the pendulum and the specimen should be shown clearly.

2. Charpy Test:

• In contrast to the Izod test, the Charpy test requires the specimen to be positioned horizontally and clamped at both ends.
• A pendulum strikes the test piece in the middle, providing a larger energy delivery of 300 joules.
• The distance that the pendulum travels after breaking the specimen is measured to evaluate toughness.
• A diagram showcasing the horizontal arrangement and the striking mechanism should be included.