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After upgrading the energy dissipation algori thm , numerical experiments were conducted to assess the rel iability of the explicit dynamic finite element code, HCRACK. Two dynami c fracture specimens , i.e., the wedge-loaded rectangular DCB (RDCB) specimen and the wedge-loaded tapered DCB (TDCB) spec imen , which were studied experimentally by Kalthoff et al , were then analyzed wi th this updated fracture dynami c code. Using the experi mentally determined dynamic fracture toughness , K ID , versus crack velocity , ~~, relation , the RDCB specimen was analyzed first by the "propagation method " where good agreements between calculated and measured K ID versus a relations were observed. The calculated a versus time , t, relation was then used as input data in the "generation method" where the resul tant K 10 were virtually identical to those obtained in the propagation method. Error analyses of the generation method were also made first by using the experimentally determined a versus t relation and secondly by artificially perturbing this relation .A TDCB specimen was then analyzed with both the propagation and generation methods by using the K ID versus ~ relation established for this specimen and the measured a versus t relation , respectively. The KEYWORDSDynamic fracture, dynamic finite element analysis , dynamic fracture toughness, crack arrest stress Intensity factor.----~~~1

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