The Diffraction of Elactic Waves on the Tip of Slot

• Main Authors: Lu, Shu-Jen, 盧樹人
• Other Authors: Shiuh-Chuan Her
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/63890355863013408828

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.