Experimental investigation and numerical simulation of first-tier sheet st12 with mechanical fittings, bolts hit under Drop weight impact.

This study has been conducted for three levels of impact energy (three Drop weight elevations). Sheets are made of st12, with dimensions of 230 * 220 mm and with thicknesses of 1 mm, 2 mm in length connected by bolts. The sheets are placed in a completely free manner on the fixture. The screws are made of a type of bolt Standard din933. In the experimental method, the picker acceleration has been measured by the accelerometer sensor and the permanent deformation of the sheet is measured at the end of the impact. The parameters to be evaluated include the impact acceleration on the sheet, the degree of permanent deformation and the energy absorption for the sheets. ABAQS finite element software has been used for numerical modeling. Comparing the results of experimental and numerical methods shows that these two research methods have close results. The results also show that energy absorption in sheets of one layer is greater than double-layered sheets, as well as acceleration in double-layered sheets more than sheets of one layer.