| dc.description.abstract | This paper investigates the dynamic response of 0.8 mm thick steel plates exposed to a combination of ballistic impact and blast loading. Two different materials, i.e., a medium-strength (Docol 600DL) steel and a high-strength (Docol 1400M) steel, were studied, and special focus was placed on the influence of material strength, work hardening and ductility. Docol 600DL has a yield stress of 325 MPa and exhibits significant work hardening and ductility, while Docol 1400M has a much higher strength with a yield stress of 1200 MPa but less work hardening and ductility. The loading of the plates was applied in two stages. First, ballistic impact tests using a smoothbore 7.62 Mauser rifle and APM2 bullets were conducted to perforate the plates at selected points. Second, the impacted plates were tested against blast loading in a shock tube. Both tests were recorded using high-speed cameras. For the blast-loading event, the high-speed cameras were used together with 3D-DIC for a detailed representation of the dynamic response of the plates. In addition, numerical results obtained from Abaqus/Explicit were compared and discussed against the experimental findings. Special focus was given to the pre-damage caused by the bullet impact and its effect on the cracking of the plate during the subsequent blast-loading tests. It was found that the crack initiation and the direction of the crack propagation during blast loading were strongly dependent on the initial cracks and damage from the ballistic impact tests. Further, the plates with the highest strength and lowest ductility (Docol 1400M) showed less resistance against the subsequent blast load compared to the medium-strength (Docol 600DL) plates with higher ductility. The numerical simulations were found to be in good agreement with the experimental findings | nb_NO |
