Abstract
The dynamic fracture and crack arrest behaviour of a C-Mn-Nb steel was investigated using two widely different experimental techniques. The first technique which follows the ASTM recommandations, is based on isothermal tests carried out on two specimen geometries with different in-plane dimensions : the “Compact Crack Arrest” geometry and the “Reduced Dynamic Effect” geometry. These specimens were instrumented in order to measure the crack velocity. The second technique, which is more original, is based on a thermal shock transient loading applied to thin discs containing at their external periphery a fatigue precrack. These specimens were cooled down and then heated up by an induction coil set in the center of the inner diameter to develop very severe temperature gradients which produce a tensile hoop stress at the external surface. A crack is initiated from the fatigue precrack which propagates very rapidly (≃100 μs) over a distance of a few centimeters and then stops in the hot material. The measured radial temperature distribution is used as the input for finite element calculations of the stress intensity factor.
Both types of experiments are analyzed using a static approach to determine the stress intensity factor at crack arrest, K1A. Similar results showing a significant shift in the brittle-ductile transition temperature are obtained from both techniques, in spite of their large differences which are discussed.
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Di Fant, M., Fontaine, A., Pineau, A. (1991). Dynamic Crack Propagation and Crack Arrest in a Structural Steel : Comparison Between Isothermal and Thermal Shock Tests. In: Rossmanith, H.P., Rosakis, A.J. (eds) Dynamic Failure of Materials. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3652-5_4
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DOI: https://doi.org/10.1007/978-94-011-3652-5_4
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