APPROXIMATE ESTIMATION OF THE FORMING ENERGY OF THIN-WALLED COMPONENTS,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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This article contains an approximate method for calculating the explosive forming energy of thin-walled, axisymmetric components. The calculations made by the proposed method were verified experimentally on a special apparatus for hydraulic stamping. The forming energy for a component is the sum of the energies, including deformation energy from tension-compression stress, bending energy, and friction. The bending energy for thin-walled components is small, so that it is possible to omit it from the total sum. It is difficult to estimate friction by theoretical meanss, because of the difficulty of determining the magnitudes of the compressive stress and the pressure on the stretched edge of the mold. In ordinary stamping on presses these energies are about 20 of the total energy. Experimental results show that the bending and friction energies which were disregarded in hydraulic forming also are about 20 of the total deformation energy, i.e., in slow speed stamping, the bending and friction loads may be taken into account.