间位芳纶纸基复合材料在高温环境下力学性能研究

Mechanical Properties of Meta-aramid Paper Composites in High Temperature Environment

本研究分析了浸渍酚醛树脂对芳纶纸力学性能的影响,研究了间位芳纶纸及格壁材料在25~280℃范围内7个不同温度点下的力学性能,并通过格壁材料力学性能参数,预测间位芳纶纸蜂窝芯材的高温力学性能。结果表明,在常温下,酚醛树脂引入后,格壁材料拉伸模量和强度相较于间位芳纶纸分别高出1.2和1.4倍。间位芳纶纸及格壁材料均表现出优异的耐高温性能,在225℃时,相较于常温,间位芳纶纸拉伸强度与模量保持率分别为62.7%和77.1%,格壁材料拉伸强度与模量保持率分别为62.0%和69.0%;在280℃时,间位芳纶纸及格壁材料拉伸强度保持率仍有44.1%。高温下间位芳纶纸及格壁材料拉伸断口处纤维拔出较少,多为纤维断裂破坏模式。本研究提出用纸张关键性能参数预测间位芳纶纸蜂窝芯材在高温环境下力学性能,预测值与实测值数据吻合较好;常温下,间位芳纶纸蜂窝芯材异面稳定压缩模量实测值与理论值偏差7.7%,与仿真值偏差1.8%;在175℃时,间位芳纶纸蜂窝芯材理论模型W向剪切模量实测值与理论值、仿真值偏差分别为12.5%和3.9%。

In this study,the effect of impregnated phenolic resin on the mechanical properties of aramid paper was analyzed,and the mechanical properties of meta-aramid paper and meta-aramid checkerboard materials were investigated at seven different temperature points,including 25~280℃,and the high-temperature mechanical properties of meta-aramid honeycomb were predicted from the mechanical property parameters of checkerboard materials.The results showed that the introduction of phenolic resin increased the tensile modulus and strength of the meta-aramid lattice wall materials by 1.2 and 1.4 times compared with that of the meta-aramid paper at room temperature.Both the meta-aramid paper and its lattice wall material showed excellent high-temperature resistance.At 225℃,the tensile strength and modulus retention rates were 62.7%and 77.1%for meta-aramid paper and 62.0%and 69.0%for aramid lattice wall material,respectively,compared with those at room temperature.And the strength retention rate of the meta-aramid paper and its lattice wall material at 280℃was still 44.1%.The tensile fracture of metaaramid paper and meta-aramid lattice wall materials at high temperatures showed less fiber pullout and more fiber breakage damage modes.The key performance parameters of paper were proposed to predict the mechanical properties of honeycomb at high temperature,and the predicted values were in good agreement with the measured values.At room temperature,the measured value of anisotropic stable compression modulus of meta-aramid honeycomb deviated from the theoretical value by 7.7%,and the simulated value deviated from the measured value of honeycomb by 1.8%.At 175℃,the deviation of the measured W shear modulus from the theoretical value was 12.5%,and the deviation of the simulated W shear modulus from the measured value of honeycomb was 3.9%.