بررسی تجربی و عددی تغییر شکل پلاستیک ورق‌های دایره‌ای تحت بارگذاری انفجاری

In this paper, the plastic deformation of fully clamped circular plates is investigated, under different blast loadings by means of the ballistic pendulum. Experimental results extracted from experiments, are evaluated according to the mid-point deflection of the plate as well as the deformation profile. In order to assess the effects of materials mechanical properties on the plate deformation, some experimental tests are performed on various types of plates with different thicknesses, including copper, steel and aluminum. Furthermore, the effect of loading type on the plate deformation is studied through varying the charge stand-off distance. The numerical simulation is carried out using the finite element analysis software ABAQUS/EXPLICIT”. In the numerical simulation, the results of calculating the pressure drop coefficient are compared, using two different methods. It should be mentioned that, for validating the numerical model, the yielded results of simulation are compared with experimental results. This comparison demonstrates that the numerical results have satisfying compatibility with experimental results. In general, regarding the presented equations, 74% and 67% of data are in the reliable range. Hence, utilizing the mentioned numerical model for predicting the deformation profile and also the mid-point deflection of circular plates is appropriate.