玻璃纤维-铝锂合金层板基于飞机服役环境的高低温性能研究

Research on High and Low Temperature Performance of Glass Fiber/Aluminum-Lithium Laminates Based on Aircraft Service Environment

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 service performance of novel fiber metal laminates(NFMLs)used in aircraft skin structure,the mechanical properties of NFMLs within-55-120℃were studied.The interlaminar performance was evaluated by the method of floating roller peeling and interlaminar shear test.The static properties were evaluated by tensile,bend and interlaminar shear tests.The yield strength of NFMLs at high and low temperature was calculated and analyzed based on the mixing theory.The results showed that the interlaminar performance of NFMLs decreased with the increase of temperature,and the tensile or bending strength had excellent high and low temperature performance,but the stiffness decreased obviously,and the change of yield strength was different from that of pure aluminum alloy.Results indicated that the mechanical properties of NFMLs maintained well within-55-70℃but deteriorated at120℃.