VELOCITY OF THE SIMPLEST SOLID-PHASE CHEMICAL-REACTION FRONT AND INTERNAL MECHANICAL STRESSES

The theory of thermal and mass elasticity is the basis for deriving eq uations for describing the stationary front of chemical transformation s in a deformable medium. Approximate formulas are obtained for the ca se of a zero-order reaction for calculating the stationary velocity in different particular Cases. An increase in the front velocity is show n to be possible, in particular, as a result of direct activation of t he chemical reaction at the expense of the work done by the deformatio n forces. Estimates for the characteristic temperature of the front an d combustion are presented. The first value is due to fracture in the front and is defined by the condition of stationary propagation of cra cks. In this case, there exist two stationary front velocities. This c orresponds to different temperature profiles.