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 *help |
¥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.
|
Report
(4 results)
Research Products
(10 results)
