DOI: 10.36347/sjet

Pages: 711-718

In order to study the transmission and diffraction phenomena of air shock wave impacting upon a flexible wall, FE models were set up to conduct numerical simulations of air blast pressure flow field by LS-DYNA software. The weights of TNT charge used in simulation were 5kg, 10kg, 15kg and 20kg respectively. The transmission and diffraction phenomena of air shock wave behind the flexible wall were analyzed and variations of pressure time history were compared. Finally, the air blast pressure distributions of transmission and diffraction wave behind the wall were presented. The results show that there are two major peak pressures behind the flexible wall. One is the transmission pressure and the other is the diffraction pressure. Transmitted pressure is caused by the motion of the deformed wall and depends on the wall’s deformation rate. Diffraction pressure is caused by the diffraction of air shock wave propagated over the wall. The distributions and variations of transmission pressure and diffraction pressure are different, and the analyses about them should be treated differently.