Study of Nonlinear Guided Wave Behavior at Imperfect Interfaces for Efficient and Sensitive Ultrasonic Nondestructive Evaluation

2015 Fiscal Year Final Research Report

• Project/Area Number: 25289005
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Kyoto University
• Principal Investigator: BIWA Shiro 京都大学, 工学(系)研究科(研究院), 教授 (90273466)
• Co-Investigator(Kenkyū-buntansha): HAYASHI Takahiro 京都大学, 大学院工学研究科, 准教授 (30324479)
• Co-Investigator(Renkei-kenkyūsha): ABE Masataka 京都大学, 大学院エネルギー科学研究科, 助教 (50582623)
• Research Collaborator: MATSUDA Naoki 京都大学, 大学院工学研究科, 博士後期課程学生 ; ISHII Yosuke 京都大学, 大学院工学研究科, 博士後期課程学生 ; MORI Naoki 京都大学, 大学院工学研究科, 博士後期課程学生
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 機械材料・材料力学 / 超音波 / 非破壊評価 / ガイド波 / 不完全界面

Outline of Final Research Achievements

Theoretical and experimental studies have been carried out to elucidate the nonlinear behavior of guided ultrasonic waves at single and layered plate structures with imperfect interfaces such as weak bonding and closed cracks. As the result of these studies, some findings of academic as well as practical importance have been obtained for the issues such as (a) the influence of propagation distance and frequency on the higher harmonic generation behavior of guided waves including Lamb waves and Rayleigh waves, (b) the reflection/transmission characteristics of guided waves and the resonance behavior at an imperfect (adhesive or contacting) joint of plates, and (c) the influence of imperfect interfaces (interlayer resin-rich regions) on the ultrasonic reflection/transmission spectra of carbon fiber reinforced composite laminates.

Free Research Field

固体力学