"Stress wave propagation and interaction in plain concrete leading up to spall fracture was investigated experimentally with a computer numerical analysis of the bar-geometry axial-impact loading. The critical normal fracture strain energy U and mechanical energy W criteria are proposed for the spatial and time dependence explanation of spallation in concrete. The energy criteria are special cases of a more generalized cumulative damage model of the form:....
Finite-difference analyses of the wave propagation and interactions in the split Hopkinson bar showed that early failure in brittle materials limits the application of the conventional method of analysis because equilibrium in the specimen is not reached before failure. The dynamic stress-strain-strain rate curves indicate that the failure strain is more a function of strain rate than is the ultimate stress, the latter case being observed by other investigators. Dynamic unloading stress-strain curves in the post-failure region are shown to be generally similar to those obtained by servo-controlled testing machines at lower strain rates"--Abstract, page ii.
Haas, Charles J.
Rollins, Ronald R.
Clark, George Bromley, 1912-
Foster, J. Earl
Pyron, Howard D.
Spokes, Ernest M., 1916-1995
Ph. D. in Mining Engineering
United States. Department of Defense
University of Missouri--Rolla
xiii, 140 pages
Note about bibliography
Includes bibliographical references (pages 89-91).
© 1972 Esteban Eulogio Miranda, All rights reserved.
Dissertation - Open Access
Concrete -- Fracture -- Mathematical models
Stress-strain curves -- Mathematical models
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Miranda, Esteban Eulogio, "Deformation and fracture of concrete under uniaxial impact loading" (1972). Doctoral Dissertations. 180.
Financial support was provided by the U. S. Department of Defense, THEMIS Contract No. DACA-45-69-C-0087.