| Summary: | 碩士 === 元智工學院 === 機械工程學系 === 85 === The diffraction of elastic wave on the crack tip has been
extensively applied to detectthe internal defects such as
cracks, cavity in materials or structures. To produces thereal
crack, it is not only diffraction but also easy to fail. In this
investigation, awidth of 0.3mm solt made by electrical discharge
machining is presented to replace thereal crack. The diffraction
of elastic wave on the tip of slot has been studied for
thematerials of steel, aluminum and brass. In the experiment,
the amplitudes of diffractedwave are measured for the varied
receiving angles.incident wave are also included. The
experimental reasults of diffraction on the tip of slot are
compared with the theoretical results of real crack tip. By
exposing theirdifferences, one could distinguish the defect
between crack and slot. On the other hand,once the real crack is
not possible to produce, present results of slot may
provideapproximately experimental data for analogy.
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