Clarification of Nonlinear Ultrasonic Propagation Behavior Due to Fiber-Matrix Interface in Composite Material

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K17979
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Kyoto University
• Principal Investigator: Matsuda Naoki 京都大学, 工学研究科, 助教 (90756818)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 超音波 / 非破壊評価 / 繊維強化複合材料 / 非線形超音波法 / 共鳴散乱理論 / 多重散乱 / 炭素繊維強化複合材料

Outline of Final Research Achievements

In this study, harmonic generation behavior due to nonlinearity of fiber-matrix interface in composite material was numerically investigated. The results shows that the directivity characteristics of the scattered wave of the second harmonics varies depending on the contact surface rigidity which is an index of the bonding state of the fiber-matrix interface. In addition, we investigated the relationship between microscopic / macroscopic damage and change of harmonic generation characteristics in carbon fiber reinforced plastic (CFRP). In this study, we obtained knowledge on the relationship between the nonlinear parameter β and the damage occurring in the CFRP, and showed the possibility of evaluating damage in CFRP by the attenuation coefficient and harmonic generation characteristics.

Free Research Field

動弾性力学に基づく超音波伝搬挙動，特に非線形現象を利用した超音波非破壊評価