This is a video in which Zac Nye introduces impact testing and how materials scientists can use this technique to measure the toughness of materials. He uses a range of chocolate bars, a portable tester and a flask of liquid nitrogen (-178°C, brrrr!!) to show a range of ways materials break and that this can be affected by the temperature.
He then demonstrates a large impact tester, from the lab at Swansea University, to show the different ways that brass and steel break. He then discusses how the way it breaks can be explained by looking at the fracture surface.
0min 08s Introduction
0min 17s What is impact testing and what does it measure?
1min 09s Introduction to the tests
2min 10s Impact testing of chocolate
3min 27s Impact testing of room temperature (Experiments)
6min 57s Impact testing of room temperature chocolate (Results)
7min 27s Impact testing of liquid nitrogen dipped chocolate (Experiments)
10min 40s Impact testing of liquid nitrogen dipped chocolate (Results)
14min 42s Impact testing of metals (steel and brass)
19min 25s Comparison of impact tests of chocolate and metals
22min 51s Fracture surfaces
27min 07s Summary
27min 38s Discussion (Zac Nye and Chris Hamlett)
Vivian’s Break a Beam videos (coming soon)
SEM Videos with Mark Coleman (coming soon)