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制备了端部带有加强箍的三种不同高度的碳纤维增强复合材料(CFRP)厚壁圆筒和层合板试样;对圆筒试样进行了准静态轴向压缩性能实验和速度在7.67～12.01m.s-1范围内的轴向冲击压缩试验,分别研究了长径比、冲击速率、端部加强等因素对轴向抗压强度、失效模式的影响规律;对CFRP层合板试样进行了不同应变率下的面内压缩试验。运用ANSYS/LS-DYNA软件对落锤加载下复合材料圆筒的响应过程进行了数值模拟。结果表明:采用端部加强方式不仅可以避免CFRP圆筒出现端部“开花式”渐进破坏的失效模式,而且能有效提高轴向抗压强度;层合板和圆筒试样的抗压强度均具有明显的正应变率效应;数值模拟结果与实验数据具有较好的一致性。
Three kinds of CFRP thick-walled cylinders and laminates were prepared at three different heights. The experimental results of the quasi-static axial compressive properties of the cylindrical specimens and the experimental results show that the CFRP- 12.01ms-1 range of axial impact compression test, respectively, the aspect ratio, impact rate, end reinforcement and other factors on the axial compressive strength and failure modes of impact; CFRP laminate samples were different In-plane compression test at strain rate. The response process of composite cylinder under falling weight was simulated by ANSYS / LS-DYNA software. The results show that not only the failure mode of gradual collapse of the CFRP cylinder can be avoided, but also the axial compressive strength can be effectively improved. The compressive strength of laminates and cylinder specimens All of them have obvious positive strain rate effect. The numerical simulation results are in good agreement with the experimental data.