Evaluation of yield strength by ultrasonic reconstruction of quadratic nonlinear Stress-Strain curve
- Authors
- Kim, Jongbeom; Kim, Chang-Soo; Kim, Kyung-Cho; Jhang, Kyung-Young
- Issue Date
- Jun-2020
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Nondestructive evaluation; Yield strength; Thermal aging; Stress-strain curve; Ultrasonic measurements; Nonlinear ultrasonics; Acoustoelasticity
- Citation
- NDT & E INTERNATIONAL, v.112, pp.1 - 6
- Indexed
- SCIE
SCOPUS
- Journal Title
- NDT & E INTERNATIONAL
- Volume
- 112
- Start Page
- 1
- End Page
- 6
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/9740
- DOI
- 10.1016/j.ndteint.2020.102242
- ISSN
- 0963-8695
- Abstract
- The ultrasonic nonlinearity parameter beta defined by the ratio of the second-order harmonic amplitude to the square of fundamental frequency amplitude, has been considered as a potential index to evaluate material degradation. However, the yield strength obtained from destructive tensile testing is still widely adopted for this purpose since it is a more intuitive concept to the field engineer than the parameter beta. Therefore, this study proposes a nondestructive method to evaluate the yield strength directly from the ultrasonic measurements. In this regard, the tensile stress-strain curve is represented in the form of a quadratic nonlinear stress-strain equation within the elastic range, which includes the linear elastic modulus and the second-order nonlinearity parameter beta(t). The linear elastic modulus is obtained by measuring the propagation velocity of longitudinal and transverse waves using a traditional ultrasonic pulse-echo method, and the second-order nonlinearity parameter is obtained by measuring the Murnaghan constants using acoustoelastic effects. Then, the tensile stress-strain curve is reconstructed to estimate the 0.01% offset yield strength. To demonstrate the application of the proposed algorithm, the experiments were performed for heat-treated SA508 specimens. The results indicate that the 0.01% offset yield strength obtained using the proposed algorithm exhibit a good agreement with that obtained via destructive tensile testing.
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