Tyndall's bar breaker

Tyndall's bar breaker is a physical demonstration experiment to demonstrate the forces created by thermal expansion and shrinkage.

1) Setup experiment with connecting rod (b) placed in frame (d) held by bar (c) and fastened by nut (a). 2) Heating phase with compensation of length extension by fastening nut (a). 3) Cooling phase with deformation or breaking of bar (c).
Realisation of Tyndall's bolt breaker experiment ready to start.

Setup

The bar breaker experiment comprises a very rigid frame (d) and a massive connecting rod (b). The rod is held on one side by a cast iron bar (c) that is going to be broken in the experiment and, at the other end, by a nut (a) that is used to compensate the thermal expansion.[1]

Procedure

During the experiment the steel rod (b) is heated with a flame (e) up to red heat temperature. During the heating phase the thermal expansion of the rod (b) is compensated by tightly fastening the nut (a). Taking away the flame starts the cooling phase. Typically the bar (c) breaks within a few minutes with a loud bang[2] or it is at least deformed significantly.

gollark: --magic py return 4
gollark: --magic py return 4
gollark: --magic py return 4
gollark: --magic py 4
gollark: --magic py 4

References
  1. Manual for Tyndall's bar breaker experiment (PDF)
  2. "Video showing Tyndall's bar breaker experiment". Retrieved 2020-08-12., University of Würzburg, Germany

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