复合材料衬套螺栓干涉连接安装过程损伤机制

Damage mechanism of composite sleeve-type bolt interference fit structure during the installation process

  • 摘要: 复合材料干涉连接结构由于能够显著降低孔周应力集中,提高结构承载能力和疲劳寿命,而成为一种先进的连接形式。但是由于复合材料层间强度低的特点,不合理的干涉螺栓连接结构形式、尺寸以及安装方式很容易引起孔壁分层,降低结构承载能力。针对该问题,本论文提出了一种基于衬套螺栓的干涉连接结构,并对该结构开展了安装过程中承载机制的试验和有限元研究。试验中测量了插钉力变化和孔壁损伤情况,有限元模型中充分考虑了层内损伤和层间分层因素,建立了基于复合材料渐进损伤和内聚力单元的损伤预测模型。通过干涉量为2.2%的衬套螺栓安装过程中的插钉力和损伤的有限元模型与试验结果对比分析发现,二者拟合度良好,证明模型的准确性。通过不同干涉量下的分层情况对比分析以及临界干涉量求解,解释了衬套螺栓提高孔壁质量的原因并提出了可靠干涉量范围。

     

    Abstract: Composite interference fit joints have become an advanced joint form because they can significantly reduce the stress concentration around the holes and thus improve the bearing capacity and fatigue life of the structure. However, due to the low interlaminar strength of composite materials, unreasonable interference bolt structure style, dimension and installation method can easily cause hole wall delamination and reduce the structure bearing capacity. To solve this problem, an interference joint structure based on sleeve-type bolts was proposed, and the experiment and finite element analysis of the structure during installation were carried out. The changes of installation force and damage around hole were measured. A damage prediction model based on progressive damage and cohesive element of composite was established by taking into full account the factors of intralaminar damage and interlaminar delamination. Through the comparative analysis of the insertion force and damage of sleeving bolts with 2.2% interference, it is found that the finite element model fits well with the test results, which proves the accuracy of the model. The reason why sleeve-type bolt can improve the quality of hole wall is explained and the range of reliable interference is put forward through comparative analysis under different interference and critical interference percentage calculation.

     

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