Stress Concentration for In-Plane Stressed Orthotropic Plate with Elliptic Opening

The paper discusses the analytical calculation procedure of stress at points along the elliptic opening boundary in an in-plane stressed infinite orthotropic plate. The presented procedure is a first step in the strength analysis of such plates. The stress dependence on material elasticity characteristics and a multilayer plate stacking sequence as well as on a position of the ellipse semi-axes for prescribed stress conditions has been presented on numerical examples while the calculation results have been illustrated by diagrams and numeric data. The specific attention is paid on the case of equal or close values of complex parameters of the orthotropic plate. The derived conclusions, pointing out a danger of stress concentration and orthotropy effects, can be very useful in engineering practice.