An Optimization Method of Curing System for Large Thickness Resin Matrix Composites

Abstract

The invention discloses a method for optimizing the curing system of a large-thickness resin-based composite material. The present invention utilizes the dynamic differential scanning calorimetry experiment data of the prepreg to obtain the curing kinetic equation of the prepreg; then uses the numerical analysis software and the finite element simulation software to establish the temperature distribution model of the composite material curing process and realizes the composite Numerical simulation calculation of temperature distribution and curing degree in the material manufacturing process; based on the support vector machine (Support Vector Machine, SVM) neural network algorithm, a surrogate model is established to solve the optimization problem, and then the process parameters are optimized. The curing system optimized by this method can reduce the curing temperature rise in the center of the composite material by 54% and 71% respectively at the peaks of the two heat preservation steps, and the curing degree of the center of the composite material at low temperature is significantly reduced, ensuring a wide range of long chains of resin molecules. Cross-linking and curing can ensure the mechanical properties of composite materials, and can be widely used in the manufacture of large-thickness resin-based composite parts such as wind power, ships and fan blades.

Description

An optimization method for curing system of resin matrix composites with large thickness technical field The invention belongs to the composite material molding manufacturing field, relate to a kind of large thickness resin matrix composite material curing system Optimization. Background technique Large bypass ratio aviation turbofan engine composite material fan blades, wind power blades and ships and other fields are widely used variable Cross-section super thick composite structure. Due to the poor thermal conductivity of the composite material during curing and the accompanying curing exotherm For example, in order to ensure the uniformity of curing and control the residual stress of large-thickness composites, a different curing method than thin-walled composites will be used. system. [0003] The high-thickness curing regime recommended by the prepreg supplier is only suitable for a certain thickness range. Whether the parts with a thickness of more than 70m...

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Problems solved by technology

[0004] However, studies have shown that excessively increasing the curing degree of composite materials at a temperature lower than the ideal curing temperature will cause the molecular cross-linking structure of the resin matrix to be a dispersed local short-chain cross-linking structure rather than a large-scale long-chain cross-linking structure. structure, which seriously affects the mechanical properties of the molding

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