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Estimation of fracture toughness of cast steel container from Charpy impact test data

  • Bellahcenea, Tassadit (Laboratoire d'Elaboration, de Caracterisation des Materiaux et Modelisation (LEC2M), Universite Mouloud Mammeri de Tizi-Ouzou) ;
  • Aberkane, Meziane (Laboratoire d'Elaboration, de Caracterisation des Materiaux et Modelisation (LEC2M), Universite Mouloud Mammeri de Tizi-Ouzou)
  • 투고 : 2016.06.07
  • 심사 : 2017.08.10
  • 발행 : 2017.12.30

초록

Fracture energy values KV have been measured on cast steel, used in the container manufacture, by instrumented Charpy impact testing. This material has a large ductility on the upper transition region at $+20^{\circ}C$ and a ductile tearing with an expended plasticity before a brittle fracture on the lower transition region at $-20^{\circ}C$. To assess the fracture toughness of this material we use, the $K_{IC}$-KV correlations to measure the critical stress intensity factor $K_{IC}$ on the lower transition region and the dynamic force - displacement curves to measure the critical fracture toughness $J{\rho}_C$, the essential work of fracture ${\Gamma}_e$ on the upper transition region. It is found, using the $K_{IC}$-KV correlations, that the critical stress intensity factor $K_{IC}$ remains significant, on the lower transition region, which indicating that our testing material preserves his ductility at low temperature and it is apt to be used as a container's material. It is, also, found that the $J_{\rho}-{\rho}$ energetic criterion, used on the upper transition region, gives a good evaluation of the fracture toughness closest to those found in the literature. Finally, we show, by using the ${\Gamma}_e-K_{IC}$ relation, on the lower transition region, that the essential work of fracture is not suitable for the toughness measurement because the strong scatter of the experimental data. To complete this study by a numerical approach we used the ANSYS code to determine the critical fracture toughness $J_{ANSYS}$ on the upper transition region.

키워드

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