识别黏弹性阻尼材料力学参数用约束阻尼试件设计方法

摘要

悬臂梁弯曲共振法识别刚度较低的黏弹性阻尼材料力学参数的实验中常以约束阻尼结构试件为实验对象，试件设计的合理程度直接关系到材料力学参数的测试精度。为了更好地指导试件设计，根据灵敏度分析法提出了影响系数的概念，并将其应用于分析试件的厚度比、共振频率比、密度比、损耗因子等参数的测量误差对黏弹性材料力学参数测试精度的影响中，进而为试件的设计提供了一些有重要工程价值的技术指标。最后，基于悬臂梁弯曲共振法实验理论，分析得到适合使用约束阻尼结构试件识别其力学参数的黏弹性阻尼材料。%The sandwich specimens with supplemental structural damping were frequently used in the measurement of mechanics parameters of viscoelastic material with low stiffness through flexural resonating cantilever beam method (FRCBM),so appropriate designed specimens might assure the accuracy of experimental results.Through sensitivity analysis,influence coefficient was proposed and used in the precision analysis of experimental results which were affected by the measurement accuraG cy of thickness ratio,resonance frequency ratio,density ratio and loss factor of the specimen,and some significant technical specifications were proposed to help design specimens.Finally,the applicaG bility of the sandwich specimens used in the measurement of viscoelastic material’s mechanics paramG eters through FRCBM was analyzed.