High magnification (electron microscope?) image of lathe tools turning various steels. Steel’s deformation is ductile, like clay.
Ultra high speed footage of breaking glass, showing a brittle fracture that propagates at about half the speed of sound in glass (kilometers per second).
Even higher speed footage (500ns between frames) of plexiglass cracking:
Tensile stretching steel rebar to failure. There is a lot of plastic deformation before the final break.
Without steel reinforcing, concrete fails in a brittle fashion, with cracks opening up in the areas in tension.
At supersonic velocity, a crash test dummy can obliterate a cinder block wall.
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