Two-dimensional analyses of subharmonic generation at closed cracks in nonlinear ultrasonics

Kazushi Yamanaka, Yoshikazu Ohara, Miyuki Oguma, Yohei Shintaku

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


Nonlinear ultrasonics plays an important role in the detection of closed cracks in critical structures and machines, such as atomic power plants and airplanes. Although the design and operation of nonlinear measurement require realistic modeling and simulation in two dimensions (2D), only one-dimensional modeling has succeeded in reproducing subharmonic generation. In this study, we propose 2D analysis using a damped double nodes (DDNs) with compression residual stress in the finite-difference time-domain method. We then succeeded in reproducing the essential feature of observed subharmonic generation at closed stress corrosion cracks.

Original languageEnglish
Article number076601
JournalApplied Physics Express
Issue number7
Publication statusPublished - 2011 Jul


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