On testing of charpy specimens using the one-point bend impact technique |
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Authors: | D Rittel A Pineau J Clisson L Rota |
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Institution: | (1) Centre des Matériaux P.M., Ecole des Mines de Paris, Fourt, Cedex, France;(2) Centre Technique de l'Armement, Cedex, France;(3) Present address: Faculty of Mechanical Engineering, Technion, 32000 Haifa, Israel |
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Abstract: | This paper reports our methodology and results for the assessment of the dynamic fracture energy of notched Charpy A508 steel
specimens. The fracture tests consist of one-point bend impact applied to the specimen in contact with an instrumented bar.
Fracture is caused by the inertia of the unsupported specimen only. The fracture energy is determined from the incident, reflected
and single wire fracture gage signals. High-speed photographic recordings show that for all the specimens investigated in
the “lower shelf” temperature regime, fracture occurs relatively early and prior to “taking off” of the bar by rigid body
motion. It also confirms that the fracture gage readings indeed coincide with the formation of a crack from the notch tip.
The present methodology is relatively easy to implement, and it allows the investigation of the fracture properties of materials
at loading rates (and velocities) that are substantially higher than those achieved in a conventional Charpy test. Moreover,
this test is attractive for modeling purposes since its boundary conditions are simple and well defined. |
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Keywords: | Charpy dynamic fracture one point bend impact instrumented bar high-speed photography |
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