Method for establishing prediction model of moisture absorption capacity of composite stiffened plate and prediction method thereof

Abstract

The invention discloses a method for establishing a prediction model of moisture absorption capacity of a composite stiffened plate and a prediction method thereof. The method comprises the steps of:firstly, dividing a moisture absorption process of an I-shaped rib composite material stiffened plate in a certain humid and hot environment into a first moisture absorption stage and a second moisture absorption stage according to the structure of the I-shaped rib composite material stiffened plate, and acquiring demarcation moisture absorption capacity of the two moisture absorption stages; secondly, based on a traditional Fick moisture absorption model, considering the side edge moisture absorption capacity of the I-shaped rib composite material stiffened plate in the two moisture absorption stages to obtain the moisture absorption capacity of the I-shaped rib composite material stiffened plate in the first moisture absorption stage and the second moisture absorption stage; and acquiring a prediction model of the moisture absorption capacity of the I-shaped rib composite material stiffened plate in the humid and hot environment by combining the demarcation moisture absorption capacity of the I-shaped rib composite material stiffened plate in the first moisture absorption stage and the second moisture absorption stage and the moisture absorption capacity of the I-shaped rib composite material stiffened plate in the first moisture absorption stage and the second moisture absorption stage, and predicting the moisture absorption capacity by utilizing the prediction model. By adopting the method, the prediction result is more accurate and the prediction precision is higher.

Description

technical field [0001] The invention belongs to the technical field of predicting the behavior of carbon fiber resin-based composite materials commonly used in aircraft in hot and humid environments, and relates to a method for establishing a prediction model for the moisture absorption of a stiffened plate of an I-shaped rib composite material in a hot and humid environment and a prediction method thereof. Background technique [0002] Composite material is a new type of material that appeared in the 1960s. It has the advantages of high specific strength, high specific stiffness, corrosion resistance and fatigue resistance, so it is widely used in modern military and civilian aircraft. And with the continuous improvement of design, production and manufacturing technology, the application proportion of composite materials in military and civilian aircraft is getting higher and higher, showing the trend of replacing traditional metal materials. [0003] For large military and...

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Problems solved by technology

[0007] The purpose of the embodiment of the present invention is to provide a method for establishing a predictive model for the moisture absorption of a composite material stiffened plate, and the problem that the traditional moisture absorption model can only be used for plate structures with regular geometric configurations leads to its limited use

[0008] Another object of the embodiments of the present invention is to provide a method for predicting the moisture absorption of a composite material stiffened panel, so as to solve the problem that the accuracy of the method for predicting the moisture absorption of a composite material stiffened panel based on the traditional Fick moisture absorption model is not high

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