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A method for reducing microwave curing stress of composite materials

A technology of composite materials and microwave curing, which is applied in the field of microwave curing of composite materials and reducing the stress of microwave curing of composite materials. Stress, meet the needs of use, improve the effect of curing quality

Active Publication Date: 2019-10-01
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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  • A method for reducing microwave curing stress of composite materials
  • A method for reducing microwave curing stress of composite materials
  • A method for reducing microwave curing stress of composite materials

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Embodiment Construction

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

[0022] Such as figure 2 shown.

[0023] A method for reducing the microwave curing stress of composite materials. In the microwave curing process of composite materials, after the resin reaches the gel point, the curing temperature will increase and decrease with time (that is, a cycle of high and low), and the cycle changes until The temperature process at which the composite is fully cured. The range of temperature rise and fall is above 10 degrees Celsius, and the heating rate and cooling rate can vary with the curing time, and they are different, such as figure 2 shown. During specific implementation, it is also possible to directly cool down after heating up, then heat up, and repeat the cycle. It can also be kept warm at the temperature turning point (the temperature range is no more than 5 degrees Celsius) for a period of time and then cool ...

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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 composite material microwave curing stress. Background technique [0002] As we all know, advanced composite materials have many excellent characteristics such as high specific strength and specific modulus, good fatigue resistance, good corrosion resistance and good overall formability. The extensive application of composite materials on aircraft can not only significantly reduce the structural weight of the aircraft, but also improve The performance of the aircraft can also greatly reduce the number of parts, simplify the 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 vario...

Claims

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Application Information

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Patent Type & Authority Patents(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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