复合材料补片参数对粘结修补含裂纹金属板结构振动特性的影响分析

Damping Effect of Bonded Composite Repair for Vibration Suppression of Cracked Metallic Panels

本文研究了粘结复合材料修复对裂纹金属板振动特性的影响规律。研究了补片几何参数对振动水平和修复效果的影响。振动水平由第一模态频率、模态阻尼损耗因子和裂纹尖端平面外的振幅表征。通过应力强度因子的幅值来评估修复效果。研究结果显示,修复后的应力强度因子会随着模态阻尼损失因子的增加而呈现渐进行为,尤其是在将阻尼材料插入复合材料补片的情况下,这种趋势更加显著。

This paper investigates the damping effect of bonded composite repair for vibration suppression of cracked metallic panels.Influence of patch geometric parameters on the vibration level and repair efficiency is examined.Vibration level is characterized by the first modal frequency,modal damping loss factor,and the vibration amplitude out of a plane at the crack tip.The repair efficiency is evaluated by the amplitude of stress intensity factor.Results reveal that after a repair the stress intensity factors exhibit an asymptotic behaviour as the modal damping loss factor increases,especially when inserting damping materials into the composite patch.