Discussion on the paper 'Evaluation of dynamic fracture toughness K-(Id) by Hopkinson pressure bar loaded instrumented Charpy impact test' by Jiang Fengchun, Liu Ruitang, Zhang Xiaoxin, Kenneth S. Vecchio and Aashish Rohatgi, Engineering Fracture Mec

摘要

In fact, all tests reported in the discussed article were 1PB ones. However, the authors neither noted this fact nor take it into account in their models (both simplified and FE). A theoretical model proposed in the article has limited applicability for 1PB or 3PB tests with short time-to-fracture because for these tests the accuracy of the model is low and, additionally, its predictions are non-conservative. FEA presented in the article contains several important drawbacks and hardly can be accepted as a test of accuracy for the model proposed.