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Stress Measurement of Structural Member Using Piezoelectric Property  

Im, Eun Sang (한국수자원공사 수자원연구원 댐기술연구소)
Kim, Tea Hoon (대우건설 기술연구소)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.11, no.2, 2007 , pp. 103-108 More about this Journal
Abstract
A stress measurement method of structural member using piezoelectric property and electrostatic voltmeter is presented. The electric potentials of the surface of the piezoelectric element, which are proportional to the strain ${\varepsilon}$ on the structural member, are measured by an electrostatic voltmeter during load cycling. The stress ${\sigma}$ is calculated by this strain ${\varepsilon}$. Moreover, a stress distribution measurement tape which can be used for the stress distribution measurement along a specified line on the surface of structural member is developed, and the surface potential was measured by an electric static voltmeter of non-contact type. The applicability of the stress distribution measurement tape is examined through experiments using a notched specimen under cyclic loading. The measured distributions of x, y and xy are compared with those calculated by FEM analysis.
Keywords
Stress measurement method; Piezoelectric property; Electrostatic voltmeter; PVDF;
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