The direct node release method is proposed to simulate dynamic crack initiation, as an acoustic emission ( AE) source model, from a circular hole on a PMMA plate under tension loading. This method avoids considering the velocity profile during the crack initiation, which has a non negligible influence on the critical loading and crack length. We evaluate under which hypothesis this method seems applicable to accurately model crack initiation . Then, the influence of the node release methods on the AE signals is investigated to figure out their influence on the AE source modeling.The direct node release method is proposed to simulate dynamic crack initiation, as an acoustic emission ( AE) source model, from a circular hole on a PMMA plate under tension loading. This method avoids considering the velocity profile during the crack initiation, which has a non negligible influence on the critical loading and crack length. We evaluate under which hypothesis this method seems applicable to accurately model crack initiation . Then, the influence of the node release methods on the AE signals is investigated to figure out their influence on the AE source modeling.