Influence of Z-Pinning on the Buckling of Composite Laminates under Edge-Wise Compression
Z-pinning is a newly developed technique to enhance the strength of composite laminates in the thickness direction. Recent experimental and theoretical studies have shown that z-pins significantly improve mode I and mode II fracture toughness. In practice, buckling accompanying delamination is a typical failure mode in laminated composite structures. For a complete understanding of the z-pinning technique towards improvements of the overall mechanical properties of laminated composites, a numerical model is developed in this paper to investigate the influence of z-pins on the buckling composite laminates with initial delaminations under edge-wise compression. The numerical results indicate that z-pinning can indeed effectively increase the compressive strength of the composite laminates provided that the initial imperfection is within a certain range. The magnitude of the improvement is consistent with available experimental data.
Hong-Yuan Liu, Xiaozhi Hu and Mark Hoffman
W. Y. Yan and H. Y. Liu, "Influence of Z-Pinning on the Buckling of Composite Laminates under Edge-Wise Compression", Key Engineering Materials, Vol. 312, pp. 127-132, 2006