Evaluation of dynamic fracture toughness KId by Hopkinson pressure bar loaded instrumented Charpy impact test |
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| Authors: | Jiang Fengchun Liu Ruitang Kenneth S. Vecchio |
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| Affiliation: | a Department of Materials Science and Engineering, Harbin Engineering University, Harbin 150001, Hei Long Jiang, PR China
b Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA |
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| Abstract: | A novel method for measuring the dynamic fracture toughness, KId, using a Hopkinson pressure bar loaded instrumented Charpy impact test is presented in this paper. The stress intensity factor dynamic response curve (KI(t)−t) for a fatigue-precracked Charpy specimen is evaluated by means of an approximate formula. The onset time of crack initiation is experimentally detected using the strain gauge method. The value of KId is determined from the critical dynamic stress intensity factor at crack initiation. A KId value for a high-strength steel is obtained using this method at a stress-intensity-factor rate ( ) greater than 106 MPa  . |
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| Keywords: | Hopkinson pressure bar Instrumented Charpy impact test Dynamic fracture toughness |
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