Optimum Configuration of Discontinuity in Ship Hull Construction (3rd Report) : Optimum Configuration of Continuous Holes in a Rectangular Elastic Plate under Uniform Loading

Abstract

In the first and second report, authors studied the optimum configuration of hole with minimum stress concentration in an infinite elastic plate under uniform loading. However, when we analize the stress distribution around hole arranged on a deck, such as hatch opening, we have to take the finite boundary condition into consideration. Also, holes are continuously arranged more than one. In this report we studied the optimum configuration of continuous holes with minimum stress concentration in a rectangular elastic plate under uniform loading. For the expression of the configulation of hole, we employ the mathematical descriptions which were proposed in the first report. At first step, we examine the single hole problem in a rectangular plate. As the result of investigation, the optimum configuration of hole depends on the ratio of the plate breadth to the hole breadth, The narrower the plate breadth becomes, the lower the stress concentration ratio drops and the optimum configuration of hole forms more rectanglelike shape than that of infinite plate. In the case of continuous hole problem, the distanse between holes affects optimum configuration of holes. The property of configuration and stress concentration of hole at both ends are similer to that of single hole. The other middle hole configurations have a small radius at corner and are more rectanglelike shape than end holes.