Journal
KOREA-AUSTRALIA RHEOLOGY JOURNAL
Volume 33, Issue 2, Pages 105-112Publisher
KOREAN SOC RHEOLOGY
DOI: 10.1007/s13367-021-0009-x
Keywords
creep test; dynamic modulus; direct conversion; relaxation spectrum; linear viscoelasticity
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Funding
- Mid-Career Researcher Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2017R1A2B1005506]
- National Research Foundation of Korea [2017R1A2B1005506] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The new numerical method converts creep data to dynamic moduli without relying on viscoelastic spectra, reducing artificial waviness in the terminal regime and noise from measurement errors. This method uses point-wise polynomial regression to dramatically reduce polynomial order compared to previous methods.
We developed a new numerical method which converts creep data to dynamic moduli without relying on viscoelastic spectra of relaxation or retardation times. This algorithm is an improvement of the previous ones (Kwon et al., 2016) in the reduction of artificial waviness in the terminal regime as well as the noise due to measurement errors. The method is the application of the point-wise polynomial regression which reduces the polynomial order dramatically compared with previous method in order to suppress the waviness.
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