Thermal response of carbon fiber reinforced epoxy composites irradiated by thermal radiation

Abstract

Although carbon fiber reinforced epoxy composites (CF/EP) have been widely used in many fields, it is still unknown if such composites could be used in extreme environments exposed to high-intensity thermal radiation that could result in severe damage to materials. In this case, CF/CP has been prepared through thermocompression method and the thermal radiation experiment has been designed and performed. The obtained results show that the parameters including irradiation power density and irradiation time directly affect the damage degree. After irradiation with 4-6 W cm −2 of thermal radiation, decomposition occurred in all CF/EP composites. In addition, the numerical simulation method was used to calculate the effect process, and the results showed that when the thermal radiation coefficient was 0.88, the calculated temperature history was consistent with that of the experiment. After irradiated at 6 W cm −2 for 30 s, the decomposition thickness reaches to 0.7 mm, indicating the high-intensity thermal radiation has caused an obvious effect on CF/EP.The irradiation experiment was conducted on the radiation platform of the thermal radiation source in the State Key Laboratory of Fire Science, University of Science and Technology of China. The structure of the platform and the position diagram of each measuring instrument are shown in figure 1. The thermal radiation source is composed of a silicon and molybdenum rod array, which generates thermal radiation through heating. The thermal radiation power density can reach 8 W cm −2 under an irradiation area of 530 mm×530 mm. Infrared thermography and thermocouple were used to measure the temperature history of the irradiated surface and back surface of the samples. A high-speed camera was used to monitor the dynamic process of sample irradiation. Photodetectors recorded the start and end times of irradiation by collecting optical signals.Epoxy resin (Model: E51) and alicyclic amine modified epoxy curing agent (Model: 6182) was obtained from Beijing Tonglian Hengxing Technology Co., Ltd Carbon fibers (Model: T300) were provided by Yancheng Xiang Sheng Carbon Fiber Technology Co., Ltd Carbon fiber CF/EP samples were prepared through compression molding, and the volume ratio of carbon fiber is 60%. The size of the CF/EP sample was 10 cm×10 cm and the thickness was 3 mm. The irradiation experiments were conducted at different power densities (4-6 W cm −2 ) and irradiation times (20-60 s).

Parametric Numerical Study and Multi-Objective Optimization of Composite Curing through Infrared Radiation

“…Absorptivity depends on many factors such as the texture of the surface, material, wavelength and temperature. For our case, an infrared region with rough, dark surfaces, grey incident radiation can be assumed, with absorptivity values in the corresponding region [51][52][53]. The curing temperature and duration span are applied in a big range to cover all possible resin formulations, while the time required to reach the temperature of the curing cycle depends on the heat generation capabilities of the apparatus.…”

Experimental system and method of aerobic thermal environment simulation based on laser heating

“…Numerous international and domestic scholars have conducted relevant research on this issue. Environment irradiation heating technology, often utilised in such scenarios 4 – 6 , typically employs graphite or molybdenum wire as heating elements. This method offers benefits such as uniform temperature distribution, low thermal inertia, and straightforward control.…”