Abstract
A method for predicting the strength and density of a material from the deceleration-time history a(t) of an instrumented impact probe is of particular interest for determining properties of the surface of the moon or a planet. A mathematical model is established for analyzing the motion of a nondeforming probe impacting a target material. The mass, geometry, and velocity of the probe, the strength and density of the target, and the variation of the resisting forces caused by increasing contact area as the probe penetrates the surface are taken into account. Numerical examples depict the effects of these variables on a(t). Supporting experimental data from other investigators for 3-in.-diam spheres penetrating balsa wood, sand, and soil, and by the present authors for 6-mm-diam spheres and 0.30-caliber armorpiercing (AP) projectiles penetrating several classes of polymeric materials, are presented.
Published Version
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