Measuring ductilebrittle transitions with impact fracture testing

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=J9gNBfG4w2Y

How do we quantify ductile vs brittle materials? One way would be to actually measure the amount of energy absorbed during fracture. We do this with impact fracture testing. Essentially, a blade is allowed to chop through a notched material and we observe the energy dissipated during fracture by observing the height of the blade before and after. Some materials have a ductile to brittle transition where we can observe the energy observed during fracture change over a temperature range. We can also observe this transition by examining fracture surfaces. In brittle regions we see smooth, ceramic-like fracture surfaces. In ductile regions we see rough surfaces. Ductile-Brittle transitions were responsible for the sinking of several ships during World War II! 2710 Liberty Ships were built in mild climates. There were 1500 ductile-brittle fractures which resulted in three Liberty Ships breaking completely in half and sinking! • More info at https://en.wikipedia.org/wiki/Liberty...

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