Application of PVDF Film to Stress Measurement of Structural Member
Application of PVDF Film to Stress Measurement of Structural Member
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PVDF薄膜在结构件应力测量中的应用
DOI：
10.2534/jjasnaoe1968.2002.591
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Nobuyasu Komatsubara
中科院分区：
文献类型：
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作者：
Gang Liu;Y. Fujimoto;E. Shintaku;S. Wakabayashi;Takuya Masaguchi;Nobuyasu Komatsubara
本文提出了一种利用PVDF薄膜和非接触式静电电压计测量应力分布的方法。聚偏氟乙烯（PVDF）薄膜因其灵敏度高等优点，非常适合于应变传感应用。考虑到薄膜材料的压电本构关系，从测量的电势确定应力和应变分布。本文首先详细推导了电势与应力之间的关系。然后，通过将聚偏氟乙烯薄膜应用于光滑板试件的实验，估计了电位-应力关系中使用的参数。其次，介绍了制备各向同性压电材料的方法和通过将两个或多个PVDF膜层叠在一起来放大PVDF膜的电势的方法，并通过实验进行了验证。最后，为了检验PVDF薄膜作为应力测量传感器的准确性，进行了含斜裂纹板试件应力分布的测量实验。实验结果与数值计算结果吻合较好。
In this paper a method to measure stress distribution using PVDF film and electrostatic voltmeter of non-contact type is developed. PVDF film is well suited to strain sensing applications for its excellent sensitivity and other good properties. The stress and strain distributions are determined from the measured potentials taking into account the piezoelectric constitutive law of film materials. First, in this paper the relationship between the electric potential and stresses is deduced in detail. Then, parameters used in the electric potential-stress relationship are estimated by an experiment applying the PVDF films to a smooth plate specimen. Next, a method to make isotropic piezoelectric material and a method too amplify the electric potential of the PVDF film by laminating two or more PVDF films together are also introduced and validated by experiment. Last, in order to check the accuracy of PVDF film as a stress measurement sensor, an experiment to measure the stress distribution of a plate specimen with an inclined crack is performed. The experimental results are in good agreement with those obtained from numerical calculation.