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Method for reducing microwave curing stress of composite material

A composite material and microwave curing technology, applied in the field of reducing the microwave curing stress of composite materials and microwave curing of composite materials, can solve the problems of reducing the microwave curing stress of composite materials, the difficulty of microwave curing to give full play to its advantages, and reducing the curing stress, so as to improve the curing Quality, meet the needs of use, reduce the effect of curing stress

Active Publication Date: 2017-07-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] The purpose of this invention is to solve the problem that microwave curing is difficult to give full play to the advantages of microwave curing due to the lack of corresponding methods for reducing curing stress when using microwave curing composite materials. Microwave Stress Curing of Composite Materials

Method used

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  • Method for reducing microwave curing stress of composite material
  • Method for reducing microwave curing stress of composite material
  • Method for reducing microwave curing stress of composite material

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Embodiment Construction

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like figure 2 shown.

[0023] A method for reducing the microwave curing stress of composite materials. During the microwave curing process of composite materials, after the resin reaches the gel point, the curing temperature increases and decreases with time for a period of time (that is, a high and a low cycle reciprocate), and the cycle changes until Temperature process for full curing of composites. The range of temperature rise and fall is more than 10 degrees Celsius, and the heating rate and cooling rate can vary with the curing time and are different, such as figure 2 shown. In the specific implementation, the temperature can be directly lowered after the temperature rise, and then the temperature can be raised again, and the cycle can be repeated. It is also possible to keep the temperature at the turning point (the temperature change...

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Abstract

A method for reducing microwave curing stress of a composite material is characterized in that in the microwave curing process of the composite material, a section of periodic change that the curing temperature rises or falls along with time and cyclically changes till the composite material is completely cured is conducted after resin reaches the gel point. By means of the method, the stress generated in the microwave curing process of the composite material can be reduced, the curing quality is improved, an ideal temperature control method is provided for microwave curing of the composite material, a foundation is laid for replacing traditional autoclave curing with microwave curing, the curing stress can be reduced by 80% or above, and use requirements of large structural components can be met.

Description

technical field [0001] The invention relates to a composite material forming technology, in particular to a composite material microwave curing technology, in particular to a method for reducing the microwave curing stress of the composite material. Background technique [0002] As we all know, advanced composite materials have many excellent properties such as high specific strength and specific modulus, good fatigue resistance, good corrosion resistance and good overall formability. The performance of the aircraft can also greatly reduce the number of parts, simplify tooling, facilitate the assembly of large parts, and speed up the manufacturing cycle. The application part transitions from the secondary load-bearing structure to the main load-bearing structure. At present, composite materials have been widely used in various control surfaces, wings and fuselage and other main load-bearing parts. The application of composite materials on complex curved components is increa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C35/08B29C70/44B29C70/54
Inventor 李迎光李楠垭周靖
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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