圧電フィルムを用いた応力分布測定テープ

概要

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A stress distribution measurement tape which can be used to measure the stress distribution along a specified line on the surface of structural member is developed in this paper. The stress distribution measurement tape is an insulating adhesive tape on which rectangular PVDF films (5.0×2.5mm) are repeatedly pasted with three inclination angles of 0, 45 and 90 degree to the direction of the tape length. Due to the property of piezoelectric material, each PVDF film will generates surface potential proportional to the applied strain after the tape is adhered onto a structural member. The surface potential can be measured by an electrostatic voltmeter of non-contact type. A tack-like electrode, a tack-pin electrode attached to the probe of the electrostatic voltmeter, is employed to measure the strain on the PVDF film within a small region. Since there are no wiring works for each PVDF film, multi-point stress measurement can be achieved easily and conveniently. The applicability of such stress distribution measurement tape is verified through experiments on a notched specimen and a cracked specimen under constant cyclic loads. The measured distributions of σ_x, σ_y and τ_<xy> are compared with those calculated by FE analysis.
社団法人日本船舶海洋工学会の論文
2004-08-31