Impact fracture of a ferritic steel in the lower shelf regime |
| |
Authors: | D Rittel B Tanguy A Pineau T Thomas |
| |
Affiliation: | (1) Faculty of Mechanical Engineering, Technion, 32000 Haifa, Israel;(2) Ecole des Mines de Paris, Centre des Matériaux P.M. Fourt, xBP 87, 91003 Evry Cedex, France;(3) Centre Technique de l'Armement, 16 bis Av. Prieur de la Côte d'Or, 94114 Arcueil Cedex, France |
| |
Abstract: | This paper reports the results of a systematic investigation on the fracture of Charpy-V notch A508 steel specimens, tested in the lower shelf regime. The fracture energy has been determined for quasi-static, standard Charpy and one-point-bend impact. The results show a general trend for the fracture energy to increase with the loading rate, at the lower temperature (–160 °C). At this temperature, the roughness of the fracture surface increases markedly with the loading rate. The fractographic analysis shows the presence of 3–4 cleavage initiation sites situated at 100–800 m from the crack front, irrespective of the loading rate. Numerous cleavage microcracks are observed underneath the main fracture plane. The statistical analysis shows that the length distribution of the microcracks is adequately described by Weibull statistics. It is also found that the number of microcracks increases with the loading rate. It is suggested that the larger number of microcracks is responsible for the observed increased roughness and energy dissipation. |
| |
Keywords: | Charpy test one-point-bend impact dynamic fracture fracture energy ferritic steel roughness Weibull |
本文献已被 SpringerLink 等数据库收录! |
|