Study of Ultrasonic Bandgaps of Layered Structures toward a Novel Principle of Nondestructive Evaluation

• Project/Area Number: 15K13833
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Kyoto University
• Principal Investigator: BIWA Shiro 京都大学, 工学研究科, 教授 (90273466)
• Co-Investigator(Renkei-kenkyūsha): ISHII YOSUKE 豊橋技術科学大学, 大学院工学研究科, 助教 (70781706)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 機械材料・材料力学 / 超音波 / 積層構造 / バンドギャップ / 非破壊評価

Outline of Final Research Achievements

The ultrasonic bandgap characteristics of layered structures have been studied theoretically and experimentally in order to establish a novel principle of nondestructive evaluation for their material properties. The main findings of this study are as follows. (1) The ultrasonic bandgap characteristics of carbon fiber reinforced composite laminates with different stacking sequences have been elucidated. It has been shown that the layer complex moduli and the interlaminar interfacial stiffnesses can be determined by fitting the analytical model to the experimental data. (2) It has been shown that poorly manufactured composite laminates can be characterized based on the temporal features of interlaminar interface echoes at the bandgap frequency. (3) The second-harmonic generation characteristics in layered structures have been analyzed theoretically, and the influence of the dispersion and the bandgap on the harmonic generation behavior has been elucidated.

Research Products

• [Journal Article] Second-harmonic generation in a multilayered structure with nonlinear spring-type interfaces embedded between two semi-infinite media (2018)
  • Author(s): Yosuke Ishii, Shiro Biwa, Tadaharu Adachi
  • Journal Title: Wave Motion Volume: 76 Pages: 28-41
  • DOI: 10.1016/j.wavemoti.2017.07.009
  • NAID: 120006528365
  • Peer Reviewed / Open Access
• [Journal Article] Evaluation of Interlaminar Interfacial Stiffnesses and Ply Complex Moduli of Carbon/Epoxy Composite Laminates by Ultrasonic Transmission Characteristics (2017)
  • Author(s): 石井 陽介，琵琶 志朗，足立 忠晴
  • Journal Title: Journal of the Japanese Society for Experimental Mechanics Volume: 17 Issue: 2 Pages: 124-130
  • DOI: 10.11395/jjsem.17.124
  • NAID: 130005865219
  • ISSN: 1346-4930, 1884-4219
  • Peer Reviewed / Open Access
• [Journal Article] Ultrasonic wave transmission and bandgap in multidirectional composite laminates with spring-type interlayer interfaces (2017)
  • Author(s): Yosuke Ishii, Shiro Biwa
  • Journal Title: Journal of the Acoustical Society of America Volume: 141 Issue: 2 Pages: 1099-1110
  • DOI: 10.1121/1.4976062
  • NAID: 120006329211
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Influence of porosity on ultrasonic wave velocity, attenuation and interlaminar interface echoes in composite laminates: Finite element simulations and measurements (2016)
  • Author(s): Yosuke Ishii, Shiro Biwa, Akira Kuraishi
  • Journal Title: Composite Structures Volume: 152 Pages: 645-653
  • DOI: 10.1016/j.compstruct.2016.05.054
  • NAID: 120006425885
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Second-harmonic generation in an infinite layered structure with nonlinear spring-type interfaces (2016)
  • Author(s): Shiro Biwa, Yosuke Ishii
  • Journal Title: Wave Motion Volume: 63 Pages: 55-67
  • DOI: 10.1016/j.wavemoti.2016.01.004
  • NAID: 120006329210
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] 複合材料積層構造の超音波バンドギャップと非破壊材料評価への応用 (2017)
  • Author(s): 琵琶志朗
  • Organizer: 日本物理学会第72回年次大会 領域10領域11領域7領域5合同シンポジウム「フォノン物理学のフロンティア：格子振動解析から超音波応用研究まで」
  • Place of Presentation: 大阪大学豊中キャンパス（豊中市）
  • Year and Date: 2017-03-18
• [Presentation] 超音波を用いたCFRP積層板のポロシティ率とその偏在分布の評価 (2017)
  • Author(s): 小山 徹，石井陽介，琵琶志朗，倉石 晃
  • Organizer: 日本材料学会第66期学術講演会
• [Presentation] Ultrasonic bandgaps and interlaminar interface echoes of composite laminates: Analysis and experiments (2017)
  • Author(s): Shiro Biwa, Yosuke Ishii
  • Organizer: 174th Meeting of the Acoustical Society of America
  • Int'l Joint Research / Invited
• [Presentation] CFRP積層板の超音波バンドギャップ発生挙動に及ぼす積層構成の影響 (2016)
  • Author(s): 石井陽介，琵琶志朗，足立忠晴
  • Organizer: 日本機械学会M&M2016材料力学カンファレンス
  • Place of Presentation: 神戸大学六甲台キャンパス（神戸市）
  • Year and Date: 2016-10-08
• [Presentation] CFRP積層板の斜角入射超音波透過特性に及ぼす積層構成の影響 (2016)
  • Author(s): 石井陽介，琵琶志朗
  • Organizer: 日本非破壊検査協会 安全・安心な社会を築く先進材料・非破壊計測技術シンポジウム
  • Place of Presentation: 西之表市民会館（西之表市）
  • Year and Date: 2016-03-17