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为确定压缩预应力对复合材料层板抗冲击损伤性能的影响,首先对不同压缩预应力下的碳纤维/双马树脂CCF300/5428层板进行了低速冲击和准静态压痕试验,然后通过热揭层和冲击后压缩试验分别得到了层板分层面积和剩余强度。结果表明:压缩预应力会大幅降低层板的接触刚度和弯曲刚度,从而导致相同冲击能量下层板凹坑深度和背部基体开裂长度增大;对于准静态压痕过程和相同冲击能量下的冲击过程,分层起始载荷和峰值载荷均随压缩预应力的增大而减小;在相同冲击能量下,随着压缩预应力的增大,层板内部分层总面积及冲击能量吸收比不断增大,剩余压缩强度不断降低。因此,压缩预应力会降低复合材料层板的冲击损伤阻抗,对损伤容限性能不利,在对承受压缩载荷结构的试验验证过程中应考虑压缩预应力对抗冲击损伤性能的影响。
In order to determine the effect of compressive prestress on the impact resistance of composite laminates, a low-speed impact and quasi-static indentation test of carbon fiber / bismaleimide resin CCF300 / 5428 under different compression prestress was carried out firstly, Layers and post-impact compression tests were obtained laminate delamination area and residual strength. The results show that compressive prestress can significantly reduce the contact stiffness and flexural rigidity of the laminates, resulting in the increase of pit depth and back crack length of the laminates under the same impact energy. For the quasi-static indentation process and the impact process under the same impact energy , The initial load and the peak load both decrease with the increase of compressive prestress. Under the same impact energy, with the increase of compressive prestress, the total internal laminar area and the impact energy absorption ratio increase continuously Large, remaining compressive strength continues to decrease. Therefore, the compressive prestress will reduce the impact damage resistance of the composite laminates, which is unfavorable to the damage tolerance performance. The influence of compressive prestress on the impact damage performance should be considered in the test verification of compressive load structures.