異方性材料の衝撃音および変形試験による弾性係数測定システムの構築

概要

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An instrumentation system has been developed to determine the elastic moduli of engineering ceramics and their composites from the sound produced by the impact of a fallen ball upon a specimen. In the system, a small rectangular bar specimen is suspended by thin ceramic threads. Using a fast Fourier transform analyzer, the natural frequencies are analyzed from the impact sound for the flexural and torsional vibration modes of the specimen. In the measurement, such a case sometimes occurs that it is difficult to distinct the correspondence between frequencies and eigen modes. In this paper, three-points bending and torsional test devices which employ the specimen for impact sound test were designed. Using the devices, elastic moduli of various materials were measured applying deformation theory for bending and torsion. The elastic constants evaluated by the impact sound test agreed well with those measured by the bending and torsional tests. A reliable measurement system was developed for elastic constants of anisotropic materials.
一般社団法人日本機械学会の論文
2004-03-25