Dilation-producing stresses and strains obtained with the aid of density measurements
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Stress systems in a deformed medium are in general of two kinds: (i) dilation-producing and (ii) nondilation-producing. Ordinarily the dilation is computed from a knowledge of the stresses, which in turn are obtained by solving the general elastostatic equations of equilibrium, under specified boundary conditions. If, however, interest is centered only in dilation-producing stresses, or in the event that only such stresses exist in the deformed system, and the density changes in the medium may be experimentally determined or postulateda priori as functions of the coordinates, these stresses may be directly obtained by a simplified procedure of solving for a particular integral of the Poisson equation without appeal to boundary conditions.** In irrotational systems in which conservative body forces exist, there is a direct relationship between the dilation and the distributed body forces. Reference to both purely physical and biophysical systems is made.
KeywordsBody Force Poisson Equation Elastic Medium Stress System Biophysical System
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