The pull-out strength of Z-pins was tested by the single Z-pin pull-out tests from the composite laminates, the critical embedded length has been calculated and tensile strength utilization ratio was introduced to characterize the utilization degree of tensile strength of Z-pins during the pull-out processes. The results show that, the critical embedded depth of the Z-pins with the diameter of 0. 50mm and that of 0. 28mm are 5. Lmm and 3. Lmm respectively. And, when the embedded depth is below the critical depth, Z-pins pull-out from the laminates and the pull-out strength of the Z-pins is proportional to the embedded depth, and is inversely proportional to the diameter. When the embedded depth is equal to or greater than the critical depth, breaks occur in the Z-pins, and the tensile strength utilization ratio of Z-pins reaches 100%. Finally, some suggestions for improving tensile strength utilization ratio of Z-pins were put forward.%通过单根Z-pin从复合材料层合板中拔出的试验方法,测试了Z-pin的拔出强度,计算了Z-pin的临界埋入深度,并引入抗拉强度利用率概念来表征Z-pin的抗拉强度在拔出过程中的利用程度.结果表明,直径0.50mm和0.28mm的Z-pin临界埋入深度分别约为5.1mm和3.1mm.当Z-pin的埋入深度小于临界埋入深度时,Z-pin从层板中拔出；Z-pin拔出强度与埋入深度成正比,与Z-pin的直径成反比；当Z-pin的埋入深度大于临界埋入深度时,Z-pin发生断裂,Z-pin的抗拉强度利用率达到100％.最后提出了提高抗拉强度利用率的建议.
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