The open holes of the composite structure will lead to a significant decrease in the structural strength. It takes the composite laminates with a central hole as the research object. Tensile tests are conduct on specimens with three different ply ratio according to ASTM D 5766 standard to study the influence of ply ratio on the tensile properties and failure modes on composite laminates. https://hollandscountryclothinges.shop/product-category/tweed-waistcoats/