Abstract
The fracture characteristics of body-centered-cubic (BBC) metallic materials is highly dependent on temperature and strain rate. To study the effects of temperature and loading rate on the dynamic fracture behavior of a high-strength low-alloy steel, a series of fracture toughness experiments were carried out using three-point-bend specimens and impact specimens. The results show that with the increase of temperature and decrease of loading rate, dynamic fracture toughness rises. Furthermore, the study indicates that dynamic fracture toughness is controlled by dislocation thermal activation motion and may be quantitatively expressed by introducing the Arrhenius equation.
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