For finite-sized targets, the presence of target edges is known to significantly alter the blast pressure acting on the loaded face in a process known as clearing – diffraction of the blast wave around the target which causes a relief wave to sweep in from the edges of the reflecting surface. This project has extended previous studies at UoS’s Blast & Impact laboratory, to confirm a model of this clearing effect, offering a significantly improved approach to simplified blast load prediction. The Single-degree-of-freedom method is used to model target response, with the spatially varying blast pressure transformed into a single point equivalent.
The combined improvements to both load prediction and response modelling has allowed a full parametric study to be conducted on finite-sized targets subjected to blast loads. Findings from this project highlight the complex nature of blast-target interaction, particularly when blast wave clearing is concerned. Results presented in the study can also be used by practicing engineers to determine the likely effect that blast wave clearing will have on any configuration of explosive mass, stand-off, target size and dynamic properties.