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Quantitative evaluation of yield strength degradation by using nonlinear ultrasonic techniques

Title
Quantitative evaluation of yield strength degradation by using nonlinear ultrasonic techniques
Author
장경영
Keywords
Quantitative evaluation; Thermal aging; Absolute ultrasonic nonlinearity parameter; Piezo-electric detection
Issue Date
2018-06
Publisher
SPIE
Citation
Proceedings of SPIE , v. 10600, 106001C
Abstract
Although the ultrasonic nonlinearity has been studied to evaluate the material degradation, it does not tell intuitively about the degree of material degradation so that the yield strength obtained from the destructive tensile test is still widely used. This study proposed a new algorithm to measure the linear and nonlinear elastic moduli based on the linear and nonlinear ultrasonic techniques, which is reduced to estimate the 0.01% offset yield strength by through the reconstruction of the tensile stress-strain curve in the form of quadratic polynomial within the elastic range. In order for demonstration, the heat-treated Al6061-T6 specimens were prepared, and the 0.01% offset yield strengths were estimated by the proposed algorithm to compare with those obtained by the tensile test. Results showed good agreement. This method can be used to evaluate the degradation of yield strength quantitatively in isotropic material.
URI
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10600/2296554/Quantitative-evaluation-of-yield-strength-degradation-by-using-nonlinear-ultrasonic/10.1117/12.2296554.fullhttp://repository.hanyang.ac.kr/handle/20.500.11754/110734
ISBN
978-151061696-7; 9781510616974
ISSN
0277-786X; 1996-756X
DOI
10.1117/12.2296554
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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