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Results are reported for pressure-shear plate impact experiments on high purity Ta foils.To study the effects of deformation-induced textures 1 series of experiments was conducted on annealed foils with minimal texture and another on unannealed foils with strong rolling textures.Strain rates varied from ∼2 × 10⁵ to >10⁶/s for 127 and 10 μm thick foils, resp.The shearing directions were at 0°, 45° or 90° from the rolling direction.The experiments on unannealed foils show a strong dependence of the initial flow stress on the orientation of the foil.The rate sensitivity of the flow stress does not appear to increase significantly at strain rates ≤5 × 10⁵/s; however, the rate sensitivity appears to become stronger at strain rates >10⁶/s.Three-dimensional finite element simulations of the experiments were performed using a crystal plasticity formulation in which textures measured using electron back-scatter patterning techniques provide the initial textures for the model.In these simulations, the shearing rates on the various slip systems are modeled as being governed by the thermally activated motion of dislocations over Peierls barriers.While these simulations showed some of the observed effects of texture, they did not reproduce the marked softening behavior observed in a few of the experiments

Smoke generation from castable pyrotechnic compositions

Author: Zilcosky, H. Joseph

Franklin Inst. Res. Laboratory: Philadelphia, Pa.A castable, completely-combustible pyrotechnic composition was developed which can be used to disseminate screening, signaling, active agents, and insecticides either by means of a continuous elongated cord or a caseless grenade.

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