Integral forming method for porous composite structural part

Abstract

The invention discloses a method for integrally forming a hole-containing thermoplastic composite material structural member. The method comprises the following steps: researching a damage mechanism of a hole member; establishing a hole edge fiber laying angle gradient change theoretical model according to the stress distribution and damage evolution rule of the hole component, determining a holeedge key area according to the model, and optimizing the fiber trend in the key area; performing variable-angle laying around the hole in a key area near the edge of the hole according to a fiber laying path obtained according to an optimization result to obtain a bottom hole, and performing finish machining on the bottom hole after curing to obtain the hole meeting the precision requirement. According to the method, fiber breakage of the thermoplastic composite material hole part can be effectively reduced, internal force distribution is optimized, and the mechanical property of the hole partis improved.

Description

technical field [0001] The disclosure relates to the field of laying and forming of composite materials, in particular to a method for integral forming of a thermoplastic composite material structural part containing holes. Background technique [0002] Fiber-reinforced resin-based composites have the advantages of high specific strength, high specific stiffness, fatigue resistance, corrosion resistance, and strong designability, so they are widely used in aerospace, ships, automobiles and other fields. According to the difference of matrix resin, composite materials can be divided into thermosetting composite materials and thermoplastic composite materials. Compared with thermosetting composite materials, thermoplastic composite materials have the advantages of simple forming process, easy recycling, weldability and low manufacturing cost. [0003] The traditional mechanical processing method is currently the main means of hole processing on composite material parts, but b...

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Problems solved by technology

Ultrasonic vibration-assisted cutting process removes materials through mechanical cutting, high-frequency impact and ultrasonic cavitation, which improves the cutting conditions, but the actual application is not mature enough, and the long-term stability needs to be verified

[0005] To sum up, whether it is traditional mechanical processing or new special processing, it adopts the method of laying first and then making holes, which causes damage and defects to the composite material structure in the process of secondary processing, and makes the parts in use Increased risk of disruption in process

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