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圆形截面复合材料管件物的能量吸收性能比方形截面管件物更加优越,但具有平整表面的方形管件物更容易与其他部件相装配,即方管在实际运用中更具优势。结合圆形与方形管件物的各自优势,以碳纤维为增强体,环氧树脂为基体,利用编织成型方法以及真空辅助树脂传递成型技术制备出编织角度为15°和60°的3类复合材料圆-方形管件物,编号为T15-15、T15-60及T60-60。通过准静态压缩实验研究了3类管件物的能量吸收性能,发现通过合理的编织角设计,可以利用周向纤维限制轴向中央裂纹的扩展,使复合材料内部更多的纤维发生断裂,从而提高纤维增强复合材料管件物的能量吸收性能。最终制备了集高能量吸收性能与易装配性于一身的圆-方异形截面复合材料管件物。
The energy absorption performance of circular cross-section composite pipe fittings is superior to that of square cross-section pipe fittings, but the square pipe fittings with flat surface are easier to assemble with other components, that is, the square pipes have more advantages in practical application. Combining the respective advantages of round and square tube, three types of composite circles with braided angles of 15 ° and 60 ° were prepared by using carbon fiber as the reinforcing material and epoxy resin as the matrix, using braided molding method and vacuum assisted resin transfer molding technique - Square pipe fittings, numbered T15-15, T15-60 and T60-60. The quasi-static compression experiments were carried out to study the energy absorption properties of the three types of pipe fittings. It was found that the circumferential fiber limits the axial central crack propagation through the rational braid angle design, and more fibers inside the composite material fracture and thus improve ENERGY ABSORPTION PROPERTIES OF FIBER REINFORCED COMPOSITE FITTINGS. Finally, a round-shaped cross-section composite pipe fitting with high energy absorbing performance and easy assembly is prepared.