Multi-parameter online monitoring system and method for hot-pressing solidification process of composite material

Abstract

The invention provides a multi-parameter online monitoring system and method for a hot-pressing solidification process of a composite material, and the system comprises a temperature sensor, an FBG (fiber bragg grating) sensor, an FBG demodulation instrument, a pressure sensor, a data recorder, and an upper computer. A multi-parameter monitoring module operating in the upper computer executes themonitoring. The monitoring method comprises a step of temperature measurement, a step of pressure monitoring, a step of strain monitoring, and a step of stress monitoring. The system and method can achieve the multi-parameter real-time coordinative online monitoring, is high in accuracy, is high in sensitivity, and can continuously and truly reflect the actual conditions of various parameters of the composite material in the hot-pressing solidification process.

Description

technical field [0001] The invention relates to the fields of engineering and material science, in particular to a multi-parameter online monitoring system and method for a composite material hot-press curing process. Background technique [0002] Advanced composite materials have significant advantages such as low density, high specific strength, high specific modulus, high temperature resistance, and fatigue resistance, and have been widely used in high-tech fields such as aerospace. In the hot-press curing molding process of composite parts, the four parameters of temperature, pressure, strain and stress are the most important. The molding quality of parts is closely related to temperature and pressure. The existence of residual stress has an impact on the mechanical properties of parts. At the same time, complex strains often appear inside the composite material during hot-press curing, resulting in defects and resulting curing deformation, which seriously affects the ph...

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Problems solved by technology

For example, for stress monitoring, the methods currently used include strain gauge embedding method, curvature method, fiber Bragg fiber method, etc. Among them, the curvature method can directly calculate the stress, but it cannot realize online monitoring. The strain gauge embedding method can monitor in real time. However, it is only applicable to symmetrical laminates, and the stress cannot be directly monitored; for strain monitoring, the original on-line monitoring technology used is relatively mature, and most of them are non-destructive testing systems using optical fiber sensors. The sensors used in these monitoring methods are expensive and difficult to operate. The difficulty coefficient is high, and there is a strain-temperature cross-sensitivity problem; for pressure monitoring, the original monitoring method uses a miniature pressure sensor, but in order to test the resin pressure, the sensor must be embedded in the composite material, and relative to the fiber size, This type of pressure sensor is too large to affect the flow of resin and the normal ordering of fibers, and cannot truly reflect the actual changes in resin pressure

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