Optimum design of fatigue strength of a cold extrusion compound container

摘要

This technical brief discusses optimum design of a cold extrusion compound container. First, the formulae of stresses for each component in the container and of shrink-fit pressure are derived. Next, the fatigue strength theory of the container is described by means of the Sines' method. Finally, mathematical models of optimum design of fatigue strength are established for monobloc, two-piece, and three-piece containers, and the following two results are obtained: (i) the maximal load capacities of two- and three-piece containers are, respectively, 1.89 and 2.04 times that of a monobloc container and (ii) it is not necessary to design compound containers with outer radii larger than 4 times their inner radii.