A pendulum-impact tester to determine the impact energy absorbed by a notched specimen during fracture. The machine releases a calibrated pendulum that strikes the specimen (either Charpy—simply supported, or Izod—cantilever clamped). The loss in pendulum height/angle gives absorbed energy, and impact strength is computed from the energy per unit area at the notch. Ideal for studying material toughness, notch sensitivity, and ductile–brittle transition..

Parts Used:

1. Pendulum Hammer & Shaft: Calibrated mass with interchangeable energies (e.g., 50/150/300 J)
2. Release & Latch Mechanism: For repeatable drop from a fixed angle (typ. ~150°)
3. Anvils/Supports:
4. Charpy: Two supports (span typically 40 mm) for a simply supported specimen
5. Izod: Vise-type clamp to hold specimen as a cantilever
6. Striker (Knife Edge): V-notched impact tip (replaceable; specified radius)
7. Angle/Dial or Encoder Display: Reads initial & post-impact swing angles/energy directly
8. Friction/Empty Swing Correction: Brake and correction scale/algorithm
9. Safety Enclosure & Guards: Transparent shield, interlock (recommended)
10. Optional: Low-temperature bath/oven for DBTT studies; specimen centering gauges; verification blocks