Abstract
Highly brittle-phase composites are widely used in military and civil applications. They are suffered from an easy fracture, resulting in premature damage. This work provides a new method to improve the strength and toughness of the C3H6N6/BaSO4 @F2314 composites through a multilayer stacking and hot-pressing techniques. The microstructure and mechanical properties of the composites were investigated, and then the crack expansion and enhancement mechanism were revealed through DIC digital imaging technique and finite element simulation. The results show that the tensile strength of C3H6N6/BaSO4 @F2314 composites with multilayer structure is 138% higher than that of ordinary composites. While the fracture toughness improved by 10.5 times more than the ordinary composites. The tensile strength is further increased by 25% via increasing the layer number of F resin without changing the content. This is mainly due to the interlayer structure of the composites can absorb a large amount of fracture energy and force cracks to extend through, which avoiding rapid crack expansion effectively.
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