Method for actively controlling lamination slippage in composite material component

Abstract

According to the method for actively controlling lamination slippage in the composite material component, the composite material component of a complex molded surface structure is divided into a plurality of areas with similar slippage rates, the slippage rate of the lamination in each area is monitored in real time, pressure is applied to the component from small to large or the temperature of the component is increased from low to high in sequence at multiple moments, and the lamination slippage rate of each area is monitored. And the laminations of one or two areas slide at a slow rate at each moment, and complex and disordered lamination slippage in the composite material component is converted into ordered slippage among the areas in the time dimension. According to the method, the serious lamination slippage defect is avoided in the forming process of the composite material complex component.

Description

technical field

[0001] The invention belongs to the technical field of composite material forming, and in particular relates to a method for actively controlling the lamination slip in a composite material component. Background technique

[0002] Fiber-reinforced resin-based composite materials are lightweight and high-strength, and have become the preferred material for weight reduction, efficiency enhancement, and performance enhancement of high-end aerospace equipment such as large aircraft, fifth-generation fighter jets, high thrust-to-weight ratio aero engines, and heavy-duty launch vehicles. The application gradually develops from thin-walled, small-curvature secondary load-bearing members to large-thickness, complex-profile primary load-bearing members.

[0003] In the molding of composite components, in order to ensure that all positions of the components can be compacted, the temperature and pressure process curves are preset before curing, and each position of the ...

Examples

example 1

[0035] Example 1: In this example, a large-thickness composite material component is selected to illustrate the method of actively controlling the lamination slip during the molding process, which is not limited to this example.

[0036] A constant pressure field of 600KPa is applied to the composite member by finite element, and a number of discrete points are extracted according to the slip rate distribution and profile curvature distribution, and the mapping relationship between profile curvature and slip rate is established by numerical fitting. The first derivative of the curve is obtained to obtain the sensitivity of the slip rate to the profile curvature. Taking the sensitivity of the slip rate to the profile curvature as the first zoning criterion, the regions are initially divided according to the same sensitivity tolerance, and the region boundaries are determined in turn. The U-shaped composite components are preliminarily divided into ①, ②, ⑤, ⑥, ③+④ five areas (su...

example 2

[0042] The difference between this example and example 1 is that the lamination slip process is actively controlled by adjusting the temperature. like Figure 8 As shown in the figure, when the resin in the composite material does not have fluidity at 35 °C, a constant compaction pressure of 600KPa recommended by the material manufacturer is applied to the component, and then the temperature is applied in sequence at multiple times, and the sliding rate is monitored in real time. The temperature actively controls the lamination slip, and the rest is the same as the above example 1.

example 3

[0044] The difference between this example and Example 1 is that the shape of the composite material component is a hyperboloid (such as Figure 9 shown), with a thickness of 2 mm, and a fiber optic sensor placed in the center of each area to monitor the lamination slip rate.

technical field

[0001] The invention belongs to the technical field of composite material forming, and in particular relates to a method for actively controlling the lamination slip in a composite material component. Background technique

[0002] Fiber-reinforced resin-based composite materials are lightweight and high-strength, and have become the preferred material for weight reduction, efficiency enhancement, and performance enhancement of high-end aerospace equipment such as large aircraft, fifth-generation fighter jets, high thrust-to-weight ratio aero engines, and heavy-duty launch vehicles. The application gradually develops from thin-walled, small-curvature secondary load-bearing members to large-thickness, complex-profile primary load-bearing members.

[0003] In the molding of composite components, in order to ensure that all positions of the components can be compacted, the temperature and pressure process curves are preset before curing, and each position of the ...

Examples

example 1

[0035] Example 1: In this example, a large-thickness composite material component is selected to illustrate the method of actively controlling the lamination slip during the molding process, which is not limited to this example.

[0036] A constant pressure field of 600KPa is applied to the composite member by finite element, and a number of discrete points are extracted according to the slip rate distribution and profile curvature distribution, and the mapping relationship between profile curvature and slip rate is established by numerical fitting. The first derivative of the curve is obtained to obtain the sensitivity of the slip rate to the profile curvature. Taking the sensitivity of the slip rate to the profile curvature as the first zoning criterion, the regions are initially divided according to the same sensitivity tolerance, and the region boundaries are determined in turn. The U-shaped composite components are preliminarily divided into ①, ②, ⑤, ⑥, ③+④ five areas (su...

example 2

[0042] The difference between this example and example 1 is that the lamination slip process is actively controlled by adjusting the temperature. like Figure 8 As shown in the figure, when the resin in the composite material does not have fluidity at 35 °C, a constant compaction pressure of 600KPa recommended by the material manufacturer is applied to the component, and then the temperature is applied in sequence at multiple times, and the sliding rate is monitored in real time. The temperature actively controls the lamination slip, and the rest is the same as the above example 1.

example 3

[0044] The difference between this example and Example 1 is that the shape of the composite material component is a hyperboloid (such as Figure 9 shown), with a thickness of 2 mm, and a fiber optic sensor placed in the center of each area to monitor the lamination slip rate.

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