Science & discovery
Cold temperatures made Liberty Ship steel brittle.
12 min
During WWII, brand-new steel ships were mysteriously cracking open in the cold Atlantic waters due to a then-unknown phenomenon called ductile-to-brittle transition. This failure changed how we understand molecular fractures and forced a total redesign of every welded structure in the world.
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Show notes
Continuous welded hulls allowed cracks to travel through entire ships at the speed of sound.
The SS Schenectady split in half while docked in calm water due to freezing temperatures.
High levels of phosphorus and sulfur caused Liberty ship steel to become brittle near freezing.
Square cargo hatch corners acted as stress points that unzipped metal hulls under pressure.
Riveted steel straps were added to welded ships to act as firebreaks against traveling cracks.
Constance Tipper proved that steel properties, not poor welding, caused the catastrophic structural failures.
In this episode
- 1Intro1 min
- 2The Mystery of the Snapping Ships2 min
- 3The SS Schenectady Incident2 min
- 4Ductile-to-Brittle Transition3 min
- 5Constance Tipper and the Solution2 min
- 6Legacy in Modern Engineering2 min
- 7Outro1 min
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