Fracture Toughness Test Charpy
Fracture Toughness Test Charpy
(Teste de tenacidade à fratura Charpy)
By carrying out Charpy impact tests at different temperature ranges (Ambient T. (28oC) and Cryogenic T. (registered on the piece: -30oC). In another series of tests, evaluate the impact resistance of Nodular and Gray Cast Iron at room temperature (28oC).
The impact test is a dynamic procedure used to evaluate the energy required to break a certain material through a load applied quickly to a specimen.
Due to its simplicity, this type of test is widely used for the study of brittle fracture in various materials.
Material's resistance to failure (crack growth) in the presence of a known flaw or Notch. Impact test are commonly used for pressure vessel, shipbuilding, bridge & structural applications, construction.
For AISI 1045, the transition mechanism suffered by this material can be verified.
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The fracture behaviors of the structures were optimized through the transition between the felt energies and characterization of the fracture faces via SEM. Emphasizing the importance of using several methods in the analysis of the ductile-brittle transition mechanism.
Note that Nodular Cast Iron with a ferritic/pearlitic matrix absorbs approximately eleven (11) times more impact energy than Gray Cast Iron with a ferritic/pearlitic matrix.
From the SEM images, it can be seen that the transition from gray cast iron is due to the way in which the graphite veins are interrupted in the structure, creating tension zones at the tips of the graphitic inclusions.
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