Penetration of rigid bodies into loose and layered media

摘要: Penetration and motion of rigid bodies in ground media attracts the researchers’ attention because various problems arising as technology evolves. In fact, there are two independent directions studies this field: (1) problem earth excavation when a body definite shape slowly moves along given trajectory ground; (2) an impact rapidly flying free or deformable against ground. latter case, to which proposed pertain, it is sometimes interest study medium behavior body, after owing kinetic energy itself. field, majority deal with collision penetration shapes into clay media. An extensive survey these [1]. After appeared, numerous paper dealing complicated conditions have been published [2]. loose has studied much more rarely. The direct fractured rock was connection expected landing spacecraft on other planets [3, 4]. influence grain dimensions density filling vacuum for initial velocities range 1.7–10 m/s. On hand, [5], results investigating conic sand at entry 700–900 m/s given; significantly exceed speed sound medium, lies 100–200 dry sand. Analyzing experimental results, author came conclusion that necessary use different representations drag force supersonic subsonic modes. present paper, we do not consider distribution, density, methods penetration. But, follows from experiments whose described [6] [7], represent up several hundreds meters per second, addition characteristics listed above, also required describe experiment preparation, such property “memory.”