Pérez-Reyes, Edgardo

Publication Search Results

Now showing 1 - 1 of 1

Hyperbolicity and genuine nonlinearity conditions for certain P-systems of conservation law, weak solutions and the entropy conditions
(2010-05) Pérez-Reyes, Edgardo; Rózga, Krzysztof; College of Arts and Sciences - Sciences; Steinberg, Lev; Acar, Robert; Department of Mathematics; Kejie, Lu
We consider a p-system of conservation laws that emerges in one dimensional elasticity theory. Such system is determined by a function W, called strain-energy function. We consider four forms of W which are known in the literature. These are St.Venant-Kirchhoff, Ogden, Kirchhoff modified, Blatz-Ko-Ogden forms. In each of those cases we determine the conditions for the parameters ρ0, µ and λ, under which the corresponding system is hyperbolic and genuinely nonlinear. We establish what it means a weak solution of an initial and boundary value problem. Next we concentrate on a particular problem whose weak solution is obtained in a linear theory by means of D’Alembert’s formula. In cases under consideration the p-systems are nonlinear, so we solve them employing Rankine-Hugoniot conditions. Finally, we ask if such solutions satisfy the entropy condition. For a standard entropy function, we provide a complete answer, except of the Blatz-Ko-Ogden case. For a general strictly convex entropy function the result is that for the initial value of velocity function near zero these solutions satisfy the entropy condition, under the assumption of hyperbolicity and genuine nonlinearity.