AN ANALYSIS OF RHT PARAMETERS IN 2D NUMERICAL SIMULATION OF CONCRETE PENETRATION WITH COMPOSITE PROJECTILES

The RHT concrete strength model and failure model are employed for the numerical simulations of composite projectile penetrating concrete targets. The simulations show that RHT parameters, specially the failure parameters, greatly influence the penetration depth, exit velocity. The failure mode of concrete should be paid great attentions in numerical analysis. If the crushing failure is the primary mechanism, RHT model seems effective. For the cracking process of concrete, the model should be tensile failure description. Reasonable material parameters are important in penetration simulations. Comparison between numerical analysis and experimental date is made for discussion about the parameter effects.

Isovector excitations in nuclei with composite projectiles: (3He, t), (d, 2He), and heavy ions

A variety of charge-exchange reactions involving complex particles has been used to study the response of a nucleus to a spin–isospin probe. The reactions have been the (3He, t) reaction, the (d, 2He) reaction, and reactions with the heavy ions 12C, 14N, 16O, and 20Ne as beam and charge exchange both ways. With all reactions, transitions are observed to the low-lying giant-resonance region, the quasi-elastic region, and the Δ region. With the (d, 2He) reaction, the spin structure of the response is studied.