Stresses in Glass-to-Metal Bead Seals at Room Temperature

JSGT 1946 V30 T201-T216

A photoelastic study has been made of the distribution of the retardations due to axialstresses and due to radial and hoop stresses in bead seals. Seals of varying glass–metal radius ratio, b/a, were tested. The observed distributions of retardation agreed substantially with those derived from the mathematical theory published previously. Direct determinations of axial stress, however, became unreliable with seals of high glass-metal radius ratio, and also with short seals. Brief reference is made to practical applications of photoelastic measurements on bead seals.

G. D. Redston & J. E. Stanworth