Buckling of circular, annular plates of non-uniform thickness

This paper deals with the solution of the title problem in the case where the outer boundary is subjected to uniform, hydrostatic pressure while the inner edge of the plate is free. It is assumed that the plate thickness varies (a) in a discontinuous fashion and (b) linearly. An approximate approach is proposed using polynomial coordinate functions which identically satisfy the boundary conditions at the outer edge, only. The eigenvalues are determined using the optimized Rayleigh-Ritz method and good engineering agreement is shown to exist with buckling parameters obtained by means of a finite element code

Unexplained Infertility

Rope consists of a group of strands of fibers or wires, twisted or braided together in various constructions and sizes [1,2]. Fibers used for fabrication of synthetic ropes are made of various polymers including nylon, aramid, polyester, and polyethylene. Wires used for fabrication of wire ropes are typically made of carbon steel. Other metals such as stainless steel and monel are also used for wire materials