Effects on Material Dynamic Initiation Toughness

摘要

In this ppaer the stainless steel single-edge notched (SEN) specimens are impacted by a Hopkinson pressure bar with different projectile velocities. The effects of crack length, specimen thickness, and the projectile velocity on the material dynamic initiation toughness determined by experimental-numerical method are comprehensively studied. The results show that the material dynamic initiation toughness determined by so-called experimental-numerical method decreases with an increase in crack length and specimen thickness as in the quasistatic case, and depends on not only the loading rate but also the projectile velocity. Therefore, to reasonably measure a material's dynamic initiation toughness by this method it is very important to accurately control the projectile velocity and correctly determine the initiation time of the specimen besides choosing the reasonable geometry of the pre-cracked specimen.