Abstract
The preparation of lightweight and high-performance material is of great significance for developing stab-resistant clothing. This paper proposes a stab-resistant composite structure combining lightweight polylactic acid (PLA) and carbon fiber reinforced polymer (CFRP). The effect of stacking sequence and filling density on the puncture resistance of composite structures was investigated by dynamic puncture and quasi-static puncture. Puncture load, energy and depth are studied as key parameters of puncture resistance. This paper investigated composite structures' failure process and damage morphology using high-speed camera photography and microscopic imaging techniques. The results show that the composite structure exhibits the strongest puncture resistance when CFRP is designed on the top layer of PLA. The higher the filling density, the lower the puncture depth of the composite structure, but the increase in the overall weight eventually leads to a decrease in the puncture specific energy (PSE). The introduction of the bottom PLA delays the penetration point of the composite structure and increases the absorption of the penetration energy by the CFRP before penetration. The final damage modes of composite structures include fiber fracture, slip and pull-out, matrix fracture and peel damage, as well as fracture damage and plastic deformation of PLA materials.
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