Abstract
Concrete and cement-paste specimens, representing a model of the actual structural material and of its adhesive component, respectively, were subjected to static and dynamic tests. Static tests on virgin specimens were carried out in order to evaluate the strength, elasticity and Poisson's ratio of the materials. The dynamic experiments were conducted in order to ascertain the response of the specimens to the propagation of one-dimensional pulses. Transient loading was accomplished by the central longitudinal impact of a 1/2-in.-diam steel sphere on a ballistically suspended 3/4-in.-diam Hopkinson bar of the material at an initial velocity of about 3260 or 1650 ips. The shocked specimens were also subsequently examined to determine whether changes in static material properties had occurred as a result of passage of the waves.
Both static and dynamic tests yielded consistent results for a number of specimens cast and cured in identical fashion. Comparison of the properties of the virgin and the shocked specimens indicated little, if any, shock damage. While some minor grain damage was observed in microscopic examination of thin sections taken from some of the shocked specimens, other sections did not indicate any visible cracking of the grains. The wave-propagation process appeared to occur without dispersion and relatively little attenuation, indicating that the material could be represented on a macroscopic scale as an “elastic” substance with a small structural-damping coefficient. The obvious inhomogeneities of the concrete affected the gage response whenever a gage was mounted directly over a piece of aggregate.
The dynamic response of the materials has been compared with the response of several types of rocks.
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References
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This work was sponsored by the U.S. Naval Ordnance Test Station, China Lake, California.
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Goldsmith, W., Polivka, M. & Yang, T. Dynamic behavior of concrete. Experimental Mechanics 6, 65–79 (1966). https://doi.org/10.1007/BF02326224
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DOI: https://doi.org/10.1007/BF02326224