Elastic properties of plates perforated by elliptical holes

Abstract

Finite element techniques have been used to calculate the relative Young's modulus, relative Poisson's ratio and the stress concentration factor for plates perforated with elliptical holes. The ellipses, of axial ratios 0.333, 1.0, 3.0 and 5.0, were arranged in rectangular and diagonal arrays. The results are discussed in terms of the parallel ligament efficiency. At low parallel ligament efficiencies, the relative moduli can be obtained by a law of mixtures. As the parallel ligament efficiency increases, the increased volume of material in the lee of the pores restricts the development of strain and so the moduli increases.