科研之友
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摘要
A comprehensive quality control of individual marble slabs within a charge used for construction purposes includes the knowledge of torsional moduli of elasticity for both orthogonal directions of slab's major surfaces. Appropriate measurement methods of the state of technology allow a reliable determination of this moduli on slabs exclusively in a destructive manner, thus only statistic statements from a strongly limited number of specimens within a charge are possible. Several damage cases have shown that such statistic statements may be insufficient. This paper introduces an eigenfrequency method which has to be applied on a measurement system with a Laser Doppler Vibrometer (LDV), in order to quickly calculate a reliable range of torsional moduli of elasticity from an oscillation transient obtained by non-destructive operation of the LDV measurement system on a marble slab. Results and advantages of the method are compared and discussed with respect to a widely used method based on ultrasonic shear waves.
- 出版日期2014-6
