CFRP干涉螺接准静态与电磁动态安装技术研究进展

Research progress on quasi-static and electromagnetic dynamic installation technologies for CFRP interference-fit bolted joints

  • 摘要: 碳纤维增强树脂基复合材料(CFRP)已广泛应用于航空关键结构,干涉螺接是其核心连接形式之一。传统准静态安装因加载速率低、孔边应力集中显著,易诱发孔壁分层与基体开裂,且面临“大干涉量引发损伤、小干涉量强化不足”的工艺矛盾,加之可行干涉量区间宽泛且难以精准确定。首先系统梳理了CFRP干涉螺接的临界干涉量取值及3类准静态安装工艺的研究现状,分析了各自强化机制与局限性;进而综述了电磁动态安装技术的工作原理与国内外研究进展,并从理论建模、数值仿真、试验与工艺应用4个层面归纳了该技术在降低安装阻力、抑制分层开裂及提升疲劳寿命方面的显著优势。研究表明,电磁动态安装能有效突破准静态工艺的干涉量窗口瓶颈,最优干涉量区间可行域可进一步明确缩小,疲劳寿命提升显著,已初步进入工程应用阶段。最后,展望了电磁动态安装技术在理论模型完善、损伤机制揭示、长期服役性能评估及智能化装备发展等方面的未来方向,以期为航空CFRP干涉螺接装配提供有益参考。

     

    Abstract: Carbon fiber reinforced polymer (CFRP) is widely used in critical aerospace structures, and interference-fit bolting is one of its key joining methods. Conventional quasi-static installation features low loading rates and high stress concentration at the hole edge, which can induce delamination and matrix cracking in the hole wall. It also faces an inherent process contradiction: large interference causes damage, while small interference provides insufficient strengthening. Moreover, the feasible interference range is broad and difficult to determine precisely. This paper systematically reviews the critical interference values and the three types of quasi-static installation processes for CFRP interference-fit bolting and analyses their respective strengthening mechanisms and limitations. It then summarises the working principle and worldwide research progress of electromagnetic dynamic installation. This technique offers significant advantages in reducing installation resistance, suppressing delamination and cracking, and improving fatigue life. These advantages are discussed from four aspects: theoretical modelling, numerical simulation, experimental studies, and process applications. Research shows that electromagnetic dynamic installation can effectively overcome the interference window bottleneck inherent in quasi-static processes. Meanwhile, it can further narrow the optimal interference range and significantly improve fatigue life. The technique has already entered the initial stage of engineering application. Finally, future research directions for electromagnetic dynamic installation are discussed, including refinement of theoretical models, elucidation of damage mechanisms, evaluation of long-term service performance, and development of intelligent equipment. This review aims to provide a useful reference for CFRP interference-fit bolted assembly in the aviation industry.

     

/

返回文章
返回