Issue 52

B. Paermentier et alii, Frattura ed Integrità Strutturale, 52 (2020) 105-112; DOI: 10.3221/IGF-ESIS.52.09 109 Figure 2: Specimen geometry, notch geometry, boundary conditions, and meshing strategy for CVN specimen (a), DWTT specimen (b), and DT3 specimen (c). CVNM ODEL One half of a standard CVN specimen with a cross section of 10 mm × 10 mm and length of 27.5 mm was constructed. As to replicate the hammer impact on the specimen, an initial velocity of 5.5 m/s and a mass of 19.8 kg were assigned to the reference point of the hammer [17]. Due to the geometry, symmetry conditions were applied on the Y-Z plane. For this model, X70 grade material properties were assigned to the specimen. DWTT M ODEL The geometry of the modelled specimen measures a cross section of 9.5 mm × 76.2 mm and a length of 152.5 mm. The larger dimensions resulted in a larger number of elements, thus an extra symmetry condition was applied. Consequently, a total of two symmetry planes were defined on the X-Y plane and on the Y-Z plane of the specimen, and only one quarter of a standard DWTT specimen was constructed. According to the performed DWTT experiments, an initial velocity of 6.5 m/s and a mass of 985 kg were assigned to the reference point of the striker. For the DWTT model, X70 material properties were assigned to the specimen.