Abstract:
Inspired by energy absorbent natural tubular biological structures, a bionic multi-tubular carbon fiber composite was designed. This bionic material was fabricated using 3D printing and UV curing, incorporating heterogeneous interfaces to significantly enhance toughness and impact resistance. Experimental results demonstrate that the bionic structure material exhibits an extended yield phase and exceptional deformation recovery in static compression tests, with the specific energy absorption of 44.6 J/g and specific strength of 130.6 MPa/(g/cm
3). In three-point bending tests, the material shows a prolonged plastic deformation region. The fracture toughness is 1.54 times compared to carbon fiber composite. For impact tests, it effectively absorbs energy with restricted crack propagation, and the destruction of heterogeneous interface. This study provides biomimetic insights for the design of impact-resistant composite materials.