Full-sea deep-use reinforced integrated gradient braided composite pressure cylinder and preparation method thereof

Abstract

The invention discloses a reinforced integrated gradient braided composite material pressure cylinder for deep sea use and a preparation method thereof, and belongs to the field of equipment materials. The present invention selects high-strength and high-modulus carbon fibers, adopts the three-dimensional gradient weaving technology to prepare the reinforced gradient weaving preform, then selects the high-strength and high-toughness hydrophobic resin matrix, and uses the resin transfer molding technology to realize the pressure cylinder of the carbon fiber reinforced gradient weaving composite material. Prepared for low weight / volume ratio, ultra-high compressive strength and stability. The full-sea reinforced pressure cylinder prepared by the invention has the advantages of good overall performance, reasonable mechanical structure, excellent lateral performance and high stability, the critical buckling load is above 110MPa, the water pressure resistance is above 120MPa, and the bulk density ratio is 0.6 g / cm 3 Hereinafter, the transverse modulus is 9800 MPa or more, and the transverse compressive load ratio is 980 MPa or more.

Description

technical field [0001] The invention relates to a reinforced integrated gradient braided composite material pressure cylinder for deep-sea use and a preparation method thereof, and belongs to the field of equipment materials. Background technique [0002] At present, the deep-sea field has become the strategic commanding height of the international scientific and technological frontier layout and competition, and the deep-sea submersibles tending to be deep-sea, high-speed and long-range have become an important development direction. The pressure cylinder accounts for 1 / 4 to 1 / 2 of the total weight of the submersible, which directly bears the ultra-high deep water static pressure and is the core structural component of the deep-sea submersible. The key breakthrough is the development of submersibles with full sea depth (maximum depth of 11,000 meters), and it is proposed that the new pressure shell should be made of composite materials, and the weight / volume ratio should no...

AI Technical Summary

Problems solved by technology

However, in the full-sea deep service environment, since there is no fiber arrangement in the thickness direction of the laminated composite cylindrical shell, microscopic fiber crack initiation and interfacial debonding are prone to occur, which in turn causes interlayer delamination and expansion, and finally macroscopic instability and failure. fracture, which also caused the weight / displacement ratio of deep-sea laminated composite cylindrical shells to be very close to the theoretical limit

At the same time, the existing composite material pressure cylinder adopts a homogeneous structure and the resin used in the composite stage of the prefabricated body is prone to poor wettability, increased water absorption, poor adhesion, and poor adaptability to fiber elongation; and in the deep sea environment, the pressure Containers are more prone to instability and failure in advance, and material structures are more prone to buckling failure

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