Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 27, 2023 - September 29, 2023
In the safety evaluation of nuclear power plant structures, the penetration evaluation of structures assuming the impact of tornadic flying objects is an important indicator. In the penetration evaluation, empirical relationship equations between the projectile and the target plate's characteristic quantities (penetration evaluation formula) are widely used. The penetration evaluation formulas assume that there is no edge deformation of the target plate, and the applicable range is defined by the size ratio of the projectile to the target plate and other factors. However, the validity of the applicable range is not clear. In this study, the effect of edge deformation of the target plate on penetration was investigated by finite element analysis simulating a penetration test of a SUS304 steel plate. The results of the analysis, in which the diameter of the target plate (w) was fixed and the diameter of the projectile (d) was varied, showed that edge deformation affected the critical velocity for penetration at w/d ≈ 11 or less. The results of the analysis for different target plate diameters showed that as the target plate became larger and the effect of edge deformation became smaller, the increase in the critical velocity of penetration became slower.
