基于压电激振的弹性模量测量方法  

Research on Measuring Method of Elastic Modulus by Piezoelectric Excitation Resonance

作　　者：贺良国[1,2] 刘永斌[2,3] 张连生[2] 琚斌[2] 潘巧生[2] 

机构地区：[1]合肥工业大学机械与汽车工程学院,合肥23009 [2]中国科学技术大学精密机械与精密仪器系,合肥230027 [3]安徽大学电气工程与自动化学院,合肥230039

出　　处：《振动．测试与诊断》2014年第6期1080-1083,1170-1171,共4页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金青年基金资助项目(51405127);中央高校基本科研业务费专项资金资助项目(WK2090090009);青年教师创新资助项目(2014HGQC0031)

摘　　要：为了提高固体材料弹性模量测量精度以及简化测量过程,提出一种新的固体材料弹性模量测量方法。首先,采用压电陶瓷激振与拾振测试试件的一阶共振频率;其次,利用有限元仿真软件ANSYS对试件的振动模态进行仿真;最后,将实测的一阶共振频率与ANSYS仿真结果进行对比,从而推算出试件材料的弹性模量。分别对钛合金、铝合金、不锈钢试件的弹性模量进行了测量与分析,测量结果精确可靠。对钛合金相同批次、相同直径、不同长度的试件进行了测量,测量误差小于0.3%。该方法消除了传统动态共振测量法中数值拟合求一阶共振频率带来的误差,ANSYS模态仿真降低了对试件的形状要求,使测量过程简化,测量精度显著提高。In this paper,a new method for measuring the elastic modulus of solid materials is proposed,in order to improve the measuring accuracy and simplify the measuring process.First,the first resonant frequency of the sample is measured by piezoelectric excitation and detection.Second,the sample is simulated through the finite element simulation software ANSYS.Finally,the sample material'selastic modulus is calculated according to the measured first resonance frequency of the sample and the simulation results.Samples of titanium alloy,aluminum alloy and stainless steel materials are tested and analyzed.The measurement results are accurate and reliable.In addition,the titanium alloy samples from the same batch with the same diameter but different lengths are measured,with an error of less than 0.3%.The errors caused by the numerical fitting of the resonance frequency in the traditional dynamic resonance method are eliminated using the method of piezoelectric excitation and detection.The tested samples are simulated in various shapes via ANSYS simulation.Thus,the measuring accuracy is significantly improved,and the measuring method is greatly simplified.

关 键 词：弹性模量 压电激振 共振频率 ANSYS仿真 

分 类 号：TH113.1[机械工程—机械设计及理论] O329[理学—一般力学与力学基础]