CAJ | 학술논문

制备了黏弹阻尼层共固化复合材料补片，对固支的薄铝板应力集中区域进行预修补，利用基于频域的半功率带宽法测试了修补前后的结构阻尼比。建立有限元模型，采用滞后阻尼的假定计算了组合结构的等效阻尼比，对比实验值验证了该模型。采用基于功率谱密度的频域分析方法估算了结构随机振动疲劳寿命。考察了阻尼层厚度、补片长度和纤维层层数对结构等效阻尼比和随机振动疲劳寿命的影响。研究结果表明制备的黏弹阻尼层共固化复合材料补片可以提高薄壁结构的阻尼效果，并可以提高修补件的振动疲劳寿命。
제비료점탄조니층공고화복합재료보편，대고지적박려판응력집중구역진행예수보，이용기우빈역적반공솔대관법측시료수보전후적결구조니비。건립유한원모형，채용체후조니적가정계산료조합결구적등효조니비，대비실험치험증료해모형。채용기우공솔보밀도적빈역분석방법고산료결구수궤진동피로수명。고찰료조니층후도、보편장도화섬유층층수대결구등효조니비화수궤진동피로수명적영향。연구결과표명제비적점탄조니층공고화복합재료보편가이제고박벽결구적조니효과，병가이제고수보건적진동피로수명。
The stress concentration region of the clamped aluminum square plate was pre-patched by the cocured composites with an embedded viscoelastic layer,the structural damp-ing ratio was tested by the half-power bandwidth method.The finite element model was es-tablished to calculate the equivalent modal damping ratios of composite structures.And the results were verified by the test.Based on the information of the power spectral density in frequency domain, the random vibration fatigue life of structures was estimated.The effects of damping layer thickness, length of the patch and the layers of the fiber on the equivalent damping ratio of the structure and random vibration fatigue life had also been studied.The results showed that the prepared composites with an embedded viscoelastic layer can improve the damping and the vibration fatigue life of the thin-walled structures.