02320nam a2200301Ia 4500003001000000005001700010040000900027090001200036245008500048490007000133520127100203650002301474650002801497650003001525650002201555650002601577650002101603700001201624700001201636700001301648700001301661700001301674856015601687942001401843008004101857999001701898952010301915MX-MdCICY20260521091735.0  cCICY  aB-2052810aEnhancement of composite open-hole tensile strength via fine Z-pins arrangements0 vInternational Journal of Mechanical Sciences, 236, p.107752, 20223 aThe damage to structural performance caused by cut-out or holes is inevitable. In this paper, a new method to improve the tensile strength of open-hole laminates by using ultrasound-guided machine to control different fine Z-pin arrangement angles was proposed. The influence of systematically changing size parameters (0.11 mm, 0.28 mm and 0.5 mm diameters)and the direction of arrangement (unenhanced, parallel, vertical and 45° to the loading direction, respectively)were investigated by experiments and simulations. The production process of Ø 0.11 mm Z-pin with tensile strength up to 3500Mpa is firstly proposed. Z-pins with larger diameters have a certain inhibition effect on the depth of delamination damage, the connected resin-rich area seriously reduces the open-hole tensile strength when increasing the volume contents. In contrast, Ø 0.11 mm Z-pins can effectively reduce the strain level around the notch compared with the unpinned specimen. Ø 0.11 mm Z-pins aligned at 45° to the loading direction resulted in a 9 percent increase in open-hole tensile strength and a 54.1 percent reduction in delamination damage area. Finally, the simulation optimization is used to find that the 30° alignment has a better effect of suppressing delamination.14aOPEN-HOLE LAMINATE14aFINE Z-PINS ARRANGEMENT14aDIGITAL IMAGE CORRELATION14aULTRASONIC C-SCAN14aX-RAY (?CT)TECHNOLOGY14aDAMAGE MECHANISM12aGao, Y.12aFei, S.12aSong, X.12aDing, H.12aWang, H.40uhttps://drive.google.com/file/d/141DJqQqKL8MN0WKq-qOz8_HUX3cNUQBz/view?usp=drivesdkzPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx  2LoccREF1250602s9999    xx |||||s2   |||| ||und|d  c30556d30556  00102Loc40708F1aCICYbCICYcREd2025-06-25l0oB-20528r2025-06-25 16:24:50w2025-06-25yREF1