高溫老化對(duì)三維角聯(lián)鎖機(jī)織復(fù)合材料低速?zèng)_擊性能影響
[Abstract]:Three-dimensional angular interlocking woven composites are widely used in impact resistant engineering structures because of their structural integrity and high delamination resistance. The impact properties of composite structures after high temperature aging are often encountered in practical applications. Quasi-static indentation and low-speed impact properties of composites after aging at different time in gas environment were observed by scanning electron microscopy (SEM), and the thermal aging properties of epoxy resin matrix were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and infrared spectroscopy (IR). The conclusions are as follows: (1) DSC and IR analysis of epoxy resin: after aging at high temperature, a post-curing exothermic peak on DSC curve and an epoxy peak on infrared spectrum (wave number 916 cm-1) disappeared, indicating that the resin cured after occurring. TGA, DSC and IR analysis of epoxy resin: the thermal decomposition rate of epoxy resin at 180 C was about 2.5 times of 90 C; with temperature and time increasing; In addition, the thermal degradation mass ratio of epoxy resin increases, and the thermal oxidation of the resin occurs when the resin is aged at 90 and 180 degrees, and the thermal degradation of the resin is serious when the resin is aged at 180 degrees. The compressive strength and modulus of the resin increased by 9.4% and 8.4%, respectively; the compressive strength and modulus of the resin decreased slightly after 32 days of aging due to thermo-oxidative degradation; the compressive strength and modulus of the resin decreased by 9.0% and 35.5% respectively after 32 days of aging due to the prominent thermo-oxidative degradation of the epoxy resin at 180 (?) Cracks. At 180 C, the aging time increases, the composite surface resin shrinkage due to severe thermal oxygen degradation, carbon fiber exposure, color gradually from grey black to brown, and finally brown. SEM observation of the cross section of the composite material found that at 180 C aging temperature, carbon fiber and resin will be debonded, and the degree of debonding with aging. Scanning electron microscopy showed that the number and length of fiber pulled out at 180 C increased with time. (3) When aging at 90 C, the quasi-static compressive strength and modulus increased with time, reaching the maximum at 16 days and increasing about 5.4% respectively. The maximum strength and modulus of the composites decreased with the aging time increasing, and decreased about 20.5% and 6.9% respectively at 32 days. 4) The variation trend of the maximum strength and modulus of the composites with aging time was consistent with that of the quasi-static composites. The maximum strength and modulus of composites decreases with the increase of aging time, and decreases by 24.2% and 6.5% at 32 days, respectively. (5) The elastic absorption energy of composites increases with the increase of aging time at 90 degrees centigrade, and increases at 32 days. The elastic absorption energy of the composites decreases firstly with the increase of time, and decreases about 19.3% at 16 days of aging. At 32 days of aging, the elastic absorption energy of the composites increases slightly compared with that of the composites after 16 days of aging. This work can further expand the design of three-dimensional textile composite engineering structures with different service time at different ambient temperatures, and expand the new content for the design of single environmental parameters commonly used at present.
【學(xué)位授予單位】:東華大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TB332
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