DETECTION OF STRESS STATE IN A PRESSURIZED THICK– WALLED CYLINDER BY MEASURING STRAINS ON ANNULAR PLATE SURFACE

Document Type : Original Article

Author

Department of Mechanical Engineering, Higher Technological Institute, 6th of October Branch.

Abstract

ABSTRACT
Measurement of Stresses and displacements inside thick cylinders, such as rocket
propellant grain and barrels, is a difficult problem. It is observed that governing
equations for solution of an annular plate, under edge moment, are analogous to that
of thick walled cylinder under internal pressure. This analogy can be used to detect
the stresses and displacement inside a thick walled cylinder by measuring of surface
stresses and slope angle of an annular plate, which can be easily measured using
electric wire strain gauges. In the present study, isotropic character for both plate
and cylinder is considered. However, if same material is used for both, the obtained
expressions are greatly simplified. Two cases of study are treated: a thick cylinder
under internal pressure bounded by a rigid wall, as a model of rocket propellant
grain, for the first, and with free outer-boundary, as a model of barrel for the second.

Keywords