| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
The dynamic shear strain analysis is developed to detect the evanescent wave field which is scattered by a finite defect in a plate. Lamb wave propagation in the transversely isotropic materials is characterized by the prominent directivity of wave energy transfer along the fibers. Consequently, it is difficult to define the location of defects by using the arriving time of reflected signals. However, in the boundary region being perpendicular with the stress-free boundary conditions are assumed. As a result of scattering on a defect edge, transmitted wave front and reflected wave front are overlapped with each other. Therefore, the linearity between the orthogonal pair of out-of-surface shear strains is violated Therefore, by using the dynamic shear strain analysis, the violation of linearity arising on the boundary of defects yields the positive value of determinant of a covariance matrix which is composed of the orthogonal pair of the shear strains.
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