Evaluation of dynamic fracture toughness KId by Hopkinson pressure bar loaded instrumented Charpy impact test
作者： Jiang Fengchun , Liu Ruitang , Zhang Xiaoxin , Kenneth S. Vecchio , Aashish Rohatgi
DOI: 10.1016/S0013-7944(03)00139-5
关键词: Intensity factor 、 Charpy impact test 、 Bar (unit) 、 Stress intensity factor 、 Fracture toughness 、 Structural engineering 、 Crack initiation 、 Split-Hopkinson pressure bar 、 Materials science 、 Strain gauge
摘要: 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 response curve (KI(t)−t) fatigue-precracked specimen evaluated by means of an approximate formula. onset time crack initiation experimentally detected strain gauge method. value KId determined from critical at initiation. high-strength steel obtained stress-intensity-factor rate ( K Id ) greater than 106 MPa m / s .
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