In-situ monitoring of VARTM curing process based on self-sensing C-GNS
Advanced composite materials are widely used in navigation,shipbuilding,automobile and civil industries because of their high specific modulus,strength,corrosion resistance and impact resistance.However,due to the limitations of manufacturing and detection technology,the superior performance of composite materials can not be fully displayed.Common liquid composite molding processes such as resin transfer molding(RTM)and vacuum assisted resin transfer molding(VARTM)encounter difficulties in the application of processing large-scale composite materials.For example,due to the lack of real-time monitoring methods,it is impossible to accurately know whether the resin in the curing process is fully cured and whether there is residual stress,which ultimately results in difficulty in ensuring product quality.In order to guarantee the quality of composite material products and the repeatability of production,it is necessary to conduct in-situ real-time monitoring of the curing process of composite materials.In this study,the ultra-thin,dense and uniform MWCNT conductive induction coating was constructed on the surface of high-porosity glass fiber nonwovens by ultrasonic atomized spraying technology,and the in-situ and real-time monitoring ability of the resin curing process in VARTM molding process was systematically analyzed.The results indicated that the C-GNS showed good response sensitivity(up to 16.77 Pa-1)in the detection process of vacuum calendering process at room temperature.In addition,the C-GNS resistor responded instantly,and could directly map the whole curing process of thermoset epoxy resin under the combined action of temperature field and pressure field and the key points(starting point of curing,starting point of gelation,gel point and complete curing)of phase transition involved in the process.Specifically,during the whole curing process,the resistance gain factor of the sensor reached up to 80％,and the real-time resistivity changes were highly consistent with the resin curing kinetic behavior measured by differential scanning calorimetry,theology and dielectric curing.This study provides an effective curing monitoring method(C-GNS)for VARTM processing and manufac-turing,and further expands the multi-functional applications of self-sensing nanocarbon composites.
万方数据
维普
