Formed mysterious cracks at sea De Havilland Comet worlds first commercial jetliner 1950s De Havilland Comet worlds first commercial jetliner 1950s In 1954 two mysteriously broke apart in midair killing dozens and bankrupting the company ID: 464020
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Liberty Ships vital to WW2 AlliesSlide2
Formed mysterious cracks at seaSlide3
De Havilland Comet, world’s first commercial jetliner (1950s)…Slide4
De Havilland Comet, world’s first commercial jetliner (1950s)… In 1954, two mysteriously broke apart in mid-air, killing dozens and bankrupting the company.Slide5
Todd Murray
The I-35W Mississippi River
Bridge before it collapsed suddenly in 2007.Slide6
Security cameras video-tapped the collapse.Slide7
Why do the things we make sometimes fail?Slide8Slide9
How is a dandelion stem like an
I
-beam?Slide10
Cracks in Liberty Ships started at squared corners of hull openingsSlide11
Cause of cracking discovered by engineer Constance Tipper, whose worked saved the vital WW2 shipping activity
Cracks in Liberty Ships started at squared corners of hull openingsSlide12
De Havilland Aircraft via R.A. Scholefield
Crash of the Comet due to cracks that formed in the window corners (that’s why airplane windows today are oval )Slide13
I-35 Bridge collapsed due to the build-up of stress concentration in the joint. The first sign was the plate that bowed under compression.Slide14
Tension fracture ripped across the rivet holes.Slide15
Analysis later showed the area under too much stress.Slide16
Most of the time we are completely unaware of these stress concentrations.Slide17
Car door handle. Cracks formed near corners rounded with a quarter circle
.Slide18
On closer inspection, the Comet airplane windows propagated cracks despite being rounded with a quarter circle fillet.Slide19
How would Nature shape a corner?