ON THE STRESS STATE OF A CREEPING CIRCULAR MEMBRANE DURING THERMAL FIXATION

Abstract

Heat setting is the heating and holding of a heated solid in a clamped (fixed) state, which eliminates the possibility of its deformation. It is known that heat setting is used in straightening thin rods and flat membranes. For example, a round membrane with a rigid contour can elastically bend during manufacture or operation and take the form of a shallow shell of revolution. Mechanical straightening of such a shell by one-sided external forces leads to its deflection in the opposite direction with a characteristic sound effect such as a clap, which is why such shells are sometimes called "clappers". This occurs due to negative stresses arising in the membrane, causing its loss of stability. Pressing the membrane to a flat surface by external forces also creates negative stresses in it and leads to a loss of stability after the removal of external loads.