지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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Nonlinear harmonic waves generated at cracked interfaces are investigated both experimentally and theoretically. A compact tension specimen is fabricated and the amplitude of transmitted wave is analyzed as a function of position along the fatigued crack surface. In order to measure as many nonlinear harmonic components as possible a broadband Lithium Niobate (LiNbO₃) transducers are employed together with a calibration technique for making absolute amplitude measurements with fluid-coupled receiving transducers. Cracked interfaces are shown to generate high acoustic nonlinearities which are manifested as harmonics in the power spectrum of the received signal. The first subharmonic (fl2) and the second harmonic (2f) waves are found to be dominant nonlinear components for an incident toneburst signal of frequency f. To explain the observed nonlinear behavior a partially closed crack is modeled by planar half interfaces that can account for crack parameters such as crack opening displacement and crack surface conditions. The simulation results show reasonable agreements with the experimental results.
목차
Abstract
1. Introduction
2. Harmonic Generation Experiment
3. Results and Discussion
4. Model Prediction for Harmonic Generation
5. Conclusions
References
참고문헌 (19)
참고문헌 신청
1. [학술지(정기간행물)] - Kyung-Young Jhang / 2009 / Nonlinear Ultrasonic Techniques for Nondestructive Assessment of Micro Damage in Material: A Review / International Journal of Precision Engineering and Manufacturing 10 (1) : 123 ~ 135
2. [학술지(정기간행물)] - J. M. Richardson / 1979 / Harmonic generation at an unbonded interface - I. Planar interface between semi-infinite elastic media / International Journal of Engineering Science 17 : 73 ~ 85
3. [학술지(정기간행물)] - J. D. Achenbach / 1982 / Loss of specular reflection due to nonlinear crack-face interaction / Journal of Nondestructive Evaluation 3 : 229 ~ 239
4. [학술지(정기간행물)] - S. Hirose / 1993 / Higher harmonics in the far-field due to dynamic crack-face contacting / Journal of the Acoustical Society of America 93 : 142 ~ 147
5. [학술지(정기간행물)] - O. Buck / 1978 / Acoustic harmonic generation at unbonded interfaces and fatigue cracks / Applied Physics Letters 33 : 371 ~ 373
2. [학술지(정기간행물)] - J. M. Richardson / 1979 / Harmonic generation at an unbonded interface - I. Planar interface between semi-infinite elastic media / International Journal of Engineering Science 17 : 73 ~ 85
3. [학술지(정기간행물)] - J. D. Achenbach / 1982 / Loss of specular reflection due to nonlinear crack-face interaction / Journal of Nondestructive Evaluation 3 : 229 ~ 239
4. [학술지(정기간행물)] - S. Hirose / 1993 / Higher harmonics in the far-field due to dynamic crack-face contacting / Journal of the Acoustical Society of America 93 : 142 ~ 147
5. [학술지(정기간행물)] - O. Buck / 1978 / Acoustic harmonic generation at unbonded interfaces and fatigue cracks / Applied Physics Letters 33 : 371 ~ 373
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UCI(KEPA) : I410-ECN-0101-2014-500-003270235