识别粘弹性材料力学参数的自由阻尼试件设计方法研究  

Research on design methods of free damping specimens used in measurement of viscoelastic material mechanical parameters

作　　者：王超[1] 吕振华[2] 钟剑锋[1] 

机构地区：[1]南京电子技术研究所,南京210039 [2]清华大学汽车工程系,北京100084

出　　处：《应用力学学报》2016年第4期582-588,734,共7页Chinese Journal of Applied Mechanics

基　　金：国家高技术研究发展计划(863计划)(2006AA110103);国家自然科学基金(51490664)

摘　　要：工程上常用悬臂梁弯曲共振法识别粘弹性材料的力学参数,而自由阻尼试件是实验中常见的结构形式,因此试件设计的合理性直接关系到材料参数的测试精度。为了能够更好地指导试件设计,首先通过灵敏度分析法定义了影响系数的含义,并将其应用于分析试件的厚度比、共振频率比、密度比等参数的误差对材料参数测试精度的影响中,进而为试件的设计提出一些有重要工程价值的技术指标。其次,基于悬臂梁弯曲共振法实验,分析得出适合采用单边自由阻尼结构试件识别的粘弹性材料。最后,对弯曲共振法中两种不同的自由阻尼试件(单边自由阻尼试件和双边自由阻尼试件)对测试精度的影响进行了比较分析,为实验中这两种结构形式的选取提供了依据。The specimens with supplemental free structural damping are frequently used in measurement of viscoelastic material mechanical parameters through flexural resonating cantilever beam method(FRCBM), so appropriate designed specimens can ensure the precision of experimental results. Through sensitivity analysis, influential coefficient is proposed and used in the precision analysis of experimental results affected by the measurement accuracy of thickness ratio, resonant frequency ratio, density ratio and loss factor of the specimens. Some significant technical specifications are proposed to help the design of specimens. The applicability of the specimens with free damping used in the measurement of viscoelastic material mechanical parameters through FRCBM is analyzed. Finally, the measurement accuracy of experimental results tested by specimens damped one side or both sides are compared and some suggestions are provided to help the selection of the specimen type.

关 键 词：粘弹性材料 试件设计 灵敏度分析 影响系数 结构阻尼 

分 类 号：U465.4[一般工业技术—材料科学与工程]