航空用碳纤维增强树脂基复合材料低温环境下弯曲性能变化研究

Flexural Properties of Carbon Fiber Reinforced Resin Matrix Composites for Aviation at Low Temperature

目的研究航空用碳纤维增强中温固化环氧脂基复合材料单向层压板在低温环境下不同试验方式弯曲性能的变化规律。方法通过改变压头半径、跨厚比、以及压头与试样之间有无塑料薄膜衬垫等试验方式,研究-50℃低温环境下不同试验方法弯曲性能的变化规律。结果低温环境下,不同的试验方式对碳纤维增强树脂基复合材料弯曲性能测试数据的影响有所不同。当使用塑料薄膜衬垫时,会显著降低试样上表面压头部位的应力集中,在低温环境下试样弯曲性能变化最低;当压头半径减小时,低温环境对试样弯曲性能影响最显著。结论如需测量温度对试样弯曲性能的影响,建议选择压头半径较小,无塑料薄膜衬垫,跨厚比L/h为32:1的试验方案。

The paper aims to study the bending behavior of unidirectional laminates reinforced with epoxy carbon fiber(CFRP) for aviation at low temperature. Test methods included changing the head radius, L/h ratio and whether there was plastic film liner between the head and the sample. The flexural properties of different test methods at low temperature -50 ℃ were studied. At low temperature, different test methods had different effects on the flexural properties of carbon fiber reinforced resin matrix composites. The stress concentration in the pressure head position on the upper surface of the specimen was significantly reduced when the plastic film liner was used;the change of flexural property was the lowest in low temperature environment at this moment. When the radius of the head decreased, the low-temperature environment had the most significant influence on the flexural property of the specimen. To measure temperature effect the performance of the sample, it is recommended to choose plastic film-free liner of small radius with L/h=32:1.