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Assessment of Thermal Degradation by Cumulative Variation of Ultrasonic Nonlinear Parameter

Title
Assessment of Thermal Degradation by Cumulative Variation of Ultrasonic Nonlinear Parameter
Author
김종범
Keywords
Cumulative ultrasonic nonlinear parameter; Ultrasonic nonlinear parameter; Thermal degradation; Aluminum alloy; Precipitation
Issue Date
2017-01
Publisher
KOREAN SOC PRECISION ENG
Citation
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING, v. 18, no. 1, page. 23-29
Abstract
The ultrasonic nonlinear parameter beta has been studied for the evaluation of material degradation. However, there is a limit to the assessment of degradation induced by thermal aging in aluminum alloy because the nonlinear parameter may fluctuate with the aging time and thus it has not one-to-one correspondence with the thermal degradation. In order to overcome such limitation, we propose a cumulative nonlinear parameter beta c defined by the accumulation of variation in the nonlinear parameter over the aging time. For verifying the usefulness of the proposed parameter, two kinds of aluminum alloy specimens heat-treated with different aging temperatures and aging times were tested. After the ultrasonic test has been completed, the tensile test was conducted for all specimens to measure the yield strength as a quantitative index of material degradation. Results showed that the nonlinear parameter beta fluctuated in directions of both increase and decrease, while the strength decreased one-sidedly with the increase of aging time. On the other hand, the proposed parameter beta c was one-sidedly increased, which showed strong exponential negative correlation with the yield strength. These tendencies were similar in different material and different aging temperature.
URI
https://link.springer.com/article/10.1007%2Fs12541-017-0003-xhttps://repository.hanyang.ac.kr/handle/20.500.11754/112217
ISSN
2234-7593; 2005-4602
DOI
10.1007/s12541-017-0003-x
Appears in Collections:
RESEARCH INSTITUTE[S](부설연구소) > RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE(산업과학연구소) > Articles
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