Z-pin reinforced technique was used to improve the performance of open-hole composite laminates

in view of load capacity reduction because of the stress concentration at the edge of the hole. The influence of the Z-pin insertion percentage on the compression performance of open-hole composite laminates was analyzed by testing the compression properties of laminates with different Z-pin inserted percentages

finite element models of the classical cohesive elements and open-hole composite laminates were established to analyze the influencing mechanism. Results showed that the reinforcing pins increased the compressive strength by 23.06% maximally. Only along the compressive loading direction

the Z-pin located on both sides of the hole can reduce the damage expansion speed by bridging force

but the ultimate failure mode of laminates was not changed. Numerical results showed that the compression damage extended from the edge of the hole to both sides

and the lamination in the center of the laminate was the first to be damaged

among which the cohesive elements in the 6th and 10th layers were the first to be damaged. The simulation results were in good agreement with the test results.