Stress intensity factor measurement of cracks using a piezoelectric element |
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Authors: | Y Fujimoto G Liu Y Tanaka E Im |
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Institution: | (1) Department of Social and Environmental Engineering, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, 739-8527 Higashi-hiroshima, Japan |
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Abstract: | We present a stress intensity factor (SIF) measurement method of cracks using a piezoelectric element and electrostatic voltmeter.
In the method, an isotropic piezoelectric element is first adhered near the crack tip. Then, the surface electrodes are attached
to the three different positions on the piezoelectric element. The electric potentials of the surface electrodes, which are
proportional to the strain sum (ɛx+ɛy) on the structural member, are measured by an electrostatic voltmeter during load cycling. Mode I and mode II SIFs of the
crack are estimated using the relationship between the SIF and (σx+σy). The applicability of the proposed method is examined through experiments and numerical analysis. |
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Keywords: | Stress intensity factor piezoelectric element crack stress intensity factor measurement numerical analysis electrostatic voltmeter polyvinylidene fluoride film electric potential |
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