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为了探究玻璃纤维-铝锂合金层板(NFMLs)应用于飞机蒙皮结构时的服役性能,开展了该材料在-55~120℃温度条件下的力学性能研究。采用浮辊剥离和层间剪切试验评价其层间性能,通过拉伸、弯曲及面内剪切试验评价其静力学性能,并基于混合理论对NFMLs在高低温下的屈服强度进行计算分析。结果表明,NFMLs层间性能随温度升高整体呈下降趋势,拉伸弯曲强度具有优异的高低温性能,但刚度下降明显,屈服强度的变化规律较纯铝合金有所不同。NFMLs在-55~70℃范围内具有优异的高低温性能,120℃时性能明显恶化。
In order to investigate the serviceability of NFMLs used in skin structure of aircraft, the mechanical properties of the material under the temperature of -55 ~ 120 ℃ were studied. The interlaminar performance of the NFMLs was evaluated by using the roller peel test and the interlaminar shear test. The static mechanical properties were evaluated by tensile, flexural and in-plane shear tests. The yield strength of NFMLs at high and low temperatures was calculated based on the hybrid theory. The results show that the interlaminar properties of NFMLs decrease with the increase of temperature, and the tensile flexural strength has excellent high and low temperature performance, but the stiffness decreases obviously. The variation law of yield strength is different from pure aluminum alloy. NFMLs has excellent high and low temperature performance in the range of -55 to 70 ° C, and the performance is obviously deteriorated at 120 ° C.