Abstract: In this paper, the three-dimensional elastic solid with internal rectangular crack is considered. Let the crack surfaces be subjected to the equal and opposite normal tractions p₀. This problem is reduced by means of Fourier transforms to the standard set of dual integral equations with two variables. Then the formulas of analytic solution of the displacements on the crack surfaces and of the stress-intensity factors of crack border are obtained.

Key words: Navier-Stokes equation, formal solution, stratification, equation secondaire