为选取一款适用于飞机主承力结构复合材料胶接修理的胶粘剂,以飞机起落架梁结构为胶接修理对象,首先根据起落架梁胶接修理场景,初步筛选了4种环氧树脂类胶粘剂。然后对这4种胶粘剂进行了基本性能考核,其次通过开展元件级修理件疲劳性能测试,从中筛选出了3M公司的D型胶粘剂,最后为了充分验证D型胶粘剂对胶接修理起落架梁疲劳寿命的提升效果,根据起落架梁服役载荷特点开展了起落架梁典型实验件疲劳性能测试。结果表明:经过D型胶粘剂胶接修理后的实验件通过了实际服役环境下的考核,修理件的止扩周次和破坏周次分别是未修理件的16倍和4.9倍,疲劳寿命增益效果显著。
To select an adhesive suitable for composite bonded repairs of aircraft primary load-bearing structures,this paper chose an aircraft landing gear beam as the repair target.Initially,four types of epoxy adhesives were preliminarily selected based on the repair scenarios for landing gear beams.Subsequently,these four adhesives underwent basic performance evaluations.Following that,fatigue performance tests at the component level were conducted to further screen the adhesives,from which D-type adhesive,manufactured by 3M,was chosen.Finally,to fully validate the effectiveness of D-type adhesive in enhancing the fatigue life of repaired landing gear beams,a typical test specimen of the landing gear beam was subjected to fatigue performance testing based on the load characteristics of the landing gear beam in service.The experimental results showed that after being repaired with D-type adhesive,the test specimens passed the evaluation under real operational loading conditions.The crack arrest and failure cycles for the repaired specimens were 16 times and 4.9 times those of the unrepaired specimens,respectively,indicating a significant improvement in fatigue life.
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基金资助
安徽省科技重大专项项目(202203a05020039)
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