Researchers used 3-D finite element method to study stress distribution in fibrous composite plates with a central hole under in-plane static loading. They analyzed how different fiber orientations affect stress concentration around the hole and found that the stress concentration factor varies with the elastic constants of the composite materials. The study also looked at the impact of plate thickness and hole diameter on stress concentration factor. The results were presented graphically and discussed, showing that the finite element method is effective for analyzing such complex problems.