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针对Z-pin增强复合材料层合板,开展了断裂韧性的试验研究。研究选取了3种Z-pin直径(0.28、0.52、0.80 mm)且每种直径下分别以3种分布形式(5×5、8×8、10×10)排布Z-pin的增强方式,为了确定比较基准,试验中同时测试了不含Z-pin的复合材料层合板试样。通过Z-pin拔出试验测试了3种直径Z-pin从基体拔出过程中的载荷-位移关系。利用双悬臂梁试验和端部开口弯曲试验分别测试了不含Z-pin和含Z-pin试样的Ⅰ型断裂应变能释放率G_(ⅠC)、Ⅱ型断裂应变能释放率G_(ⅡC)。试验结果表明:与不含Z-pin的结构相比,Z-pin增强试样的Ⅰ型断裂应变能释放率G_(ⅠC)增大了83%～1110%,Ⅱ型断裂应变能释放率G_(ⅡC)增大了23%～438%;在相同Z-pin体积含量下,与增大Z-pin直径相比,增大Z-pin分布密度能更有效地提高复合材料层合板的断裂韧性。
For the Z-pin reinforced composite laminates, the fracture toughness of the experimental study. Three Z-pin diameters (0.28,0.52,0.80 mm) were selected and the Z-pin enhancement modes were arranged in three different distributions (5 × 5, 8 × 8, 10 × 10) In order to determine the baseline, Z-pin-free composite laminates were also tested in the test. The load-displacement relationship of three kinds of Z-pins with diameter removed from the substrate was tested by the Z-pin pullout test. Using the double cantilever beam test and the open end bending test, the strain Ⅰ (Ⅰ) strain release rate (ⅡC), Ⅱ strain strain release rate (ⅡC) and the Z- . The experimental results show that compared with the structure without Z-pin, the tensile strain energy release rate (Ⅰ_C) of Z-pin reinforced specimens increases by 83% ~ 1110%, and the strain energy release rate (Ⅱ C) increased by 23% ~ 438%. In the same volume of Z-pin, increasing the Z-pin distribution density can increase the fracture toughness of the composite laminates more effectively than increasing the Z-pin diameter .