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研究了碳纤维增强聚酰亚胺树脂基复合材料MT300/KH420的高温力学性能,重点揭示了MT300/KH420的[0°]_7、[0°]_(14)和[±45°/0°/90°/+45°/0°_2]_s层合板在常温~500℃的拉伸和层间剪切性能的变化规律。结果表明:在350℃以内,[0°]_7层合板拉伸强度随温度升高有所提高,拉伸模量几乎不变,在420℃时拉伸强度和模量均出现明显下降,在500℃时分别保持在65%和83%以上,表现出优异的高温拉伸性能。MT300/KH420的[0°]_(14)层合板层间剪切强度在常温~420℃随温度升高不断降低至52.8%,在高温下呈现出黏弹效应,且在420℃时最为明显。相比于单向层合板,[±45°/0°/90°/+45°/0°_2]_s多向层合板高温力学性能较为稳定,且由纤维控制的纵向试件力学性能受温度影响较小。
The mechanical properties at high temperature of carbon fiber reinforced polyimide resin matrix composites MT300 / KH420 were investigated. The results show that [0 °] _7, [0 °] _ (14) and [± 45 ° / 0 ° / 90 ° / + 45 ° / 0 ° _2] _s laminates at room temperature to 500 ℃ tensile and shear properties of the law of change. The results show that the tensile strength of [0 °] _7 laminates increases with the increase of temperature at 350 ℃, the tensile modulus almost does not change, and the tensile strength and modulus decrease obviously at 420 ℃. 500 ℃ were maintained at 65% and 83%, respectively, showing excellent high temperature tensile properties. The interlamellar shear strength of [0 °] _ (14) laminates of MT300 / KH420 continuously decreased from 52.8% at room temperature to 420 ° C with a viscoelastic effect at high temperature and most pronounced at 420 ° C . Compared with unidirectional laminates, the mechanical properties of multi-directional laminates at high temperature are relatively stable and the mechanical properties of longitudinal specimens controlled by fibers are affected by temperature Less affected.