| Citation: | WANG Rong, YU Yalin, WANG Lechen, et al. Effects of prepreg ambient-temperature storage life on mechanical properties of MT700/603 composites[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(12): 2434-2441. doi: 10.13700/j.bh.1001-5965.2021.0121(in Chinese)
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A hot-melt prepreg MT700/603 was prepared. The correlation between ambient-temperature storage life and the degree of pre-curing, and effects of pre-curing degree on composite quality and mechanical properties were investigated and discussed. The relationship among prepreg storage life, pre-curing degree and composite properties was established. The results show that the minimum viscosity is increased by 4.6 times after 60 days' storage at room temperature. Meanwhile, the glass transition temperature is increased by 17.9 ℃ and the pre-curing degree is increased to 11.2%. When storage life is less than 30 days, the composites show good internal quality, uniform fiber distribution and low porosity (≤0.03%), and the pre-curing degree is less than 5.3%. The longitudinal compression strength and modulus of composites tendentiously dependent on the failure of resin matrix are more sensitive to porosity than the longitudinal tensile strength and modulus dependent on the failure of fiber reinforcement. With the extension of storage life, the pre-curing degree and the viscosity of resin increases, and there is a mismatch between the pressurized moment and the resin gel point, which is the fundamental reason for the decrease of mechanical properties in composites. The maximum ambient-temperature storage life can be deduced according to the design requirement and mechanical properties data in different storage periods, realizing the quantitative evaluation of the prepreg availability.
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