腐蚀环境下复合材料修补件力学特性研究

采用复合材料补片胶接修补含裂纹LY12CZ铝合金板,开展了试验室大气环境和加速预腐蚀环境下复合材料修补件静强度拉伸和疲劳裂纹扩展对比试验研究.结果表明,复合材料补片均能显著提高损伤结构的拉伸强度和疲劳寿命,且短周期的预腐蚀环境对修补件两种力学特性的影响可以忽略不计.同时,基于Paris公式和Rose分析模型,建立了常规环境和预腐蚀环境下疲劳裂纹扩展寿命预测模型,通过与试验结果的对比证明了该模型的工程有效性.

MECHANICAL BEHAVIOR OF COMPOSITE REPAIRED COMPONENTS UNDER CORROSION ENVIRONMENT

The center cracked LY12CZ aluminum alloy plates were adhesively bonded with composite patches, and the tensile strength,the fatigue life and the crack growth during fatigue under air environment and accelerated pre-corrosion environment were investigated experimentally.The experimental results show that both the static strength and the fatigue life of the repaired aluminum substrates are significantly increased for the bonded composite patches,and the short-term pre-corrosion environment does not have a notable effect on the mechanical performance of composite repaired components.Also,a simple fatigue crack growth life prediction model,based on Paris formula and Rose’s analytical solution,is proposed to predict the fatigue behavior of the repaired plates under air and pre-corrosion environments.The result shows a good quantitative agreement with experimental data.