Transactions of Nanjing University of Aeronautics & Astronautics
Bridging Effect and Efficiency of Partly-Cured Z-pin Reinforced Composite Laminates
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
To study the bridging effect of partly-cured Z-pin, Z-pins with different curing degrees are manufactured by controlling pultrusion parameters. A unit cell is selected to analyze the stress of Z-pinned laminates and the quantitative relationship between the maximum bridging force and Z-pin diameter, embedded length, interfacial shear strength and tensile strength is acquired. The Z-pin ″bridging law″ test and Z-pin tensile test are carried out to study the effect of Z-pin′s curing degree on bridging effect, and the bridging efficiency is defined to evaluate the reinforcement effect of Z-pin. The mode Ⅰ interlaminar fracture toughness (GⅠC) is measured by the double cantilever beam test. The experimental results show that Z-pin′s co-curing with laminate matrix can improve the bridging force significantly and the fitting results show a linear relationship between Z-pin curing degree and interfacial shear strength. The three-dimensional images of the surface of pullout Z-pins indicate that the failure mode changed from totally interfacial debonding to a mixed mode. Finally, the reinforcement by partly-cured Z-pin can be used to further enhance the interlamina r toughness. Compared with completely-cured Z-pin, ＧⅠC of Z-pin with 67.6% curing degree increases by 47.0%.
Keywords:
Project Supported:
Clc Number:
CHINA AERO-SCIENCES
Mobile website
