| Abstract: | The effect of the static strength (yield stress) of a material on major penetration parameters (specific work of cavity formation
and pressure at the contact surface) was examined. The analytical equations and the quantitative evaluation of the specific
work spent for the formation of a spherical or cylindrical cavity and of the pressure at the surface of such cavities upon
their static expansion were obtained for rigid-plastic and elastoplastic materials. The evaluation of the specific work of
deformation upon the formation of the spherical cavity in the plate and the cylindrical one upon the penetration of a rigid
rod are shown to be adequate. The influence of strain hardening on maximum radial stresses on the cavity surface was evaluated.
The resistance to penetration and the expansion of a cavity are shown to be influenced by the elastic compressibility of a
material in the inelastic region. The kinetics of the stress-strain state of the material upon the formation of the cavity
was analyzed for the case of considerable deformation of a rod at penetration.
Institute of Problems of Strength, National Academy of Sciences of Ukraine, Kiev Ukraine. Translated from Problemy Prochnosti,
No. 1, pp. 93–110, January–February, 2000. |
