the relaxation modulus master curve of HDPE (trade mark YEM4803T)
Description
figure 4-Curve fitting to the test data of HDPE tensile relaxation modulus with time figure 4 is the relaxation modulus master curve of HDPE (trade mark YEM4803T).
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Steps to reproduce
How to reproduce figure 4 Curve fitting to the test data of HDPE tensile relaxation modulus with time. The long-term behavior of HDPE(trade mark YEM4803T) is represented by the relaxation modulus acquired by dynamic mechanical analysis (DMA) test. Based on the time-temperature equivalence principle, the relaxation modulus of HDPE under a certain reference temperature can be ascertained. So DMA tests at different temperatures were carried out using the single cantilever deformation mode, according to ASTM D4065-2006[American Society for Testing Materials. Standard practice for plastics-Dynamic mechanical properties-Determination and Report of Procedures. ASTM D4065: 2006.]. The DMA specimen has the size of 34.96mm*12.01mm*1.001mm. In order to ensure that the PSP and the DMA specimens were of the same physical age, the DMA specimens were machined from the inner liner of the prototype PSP. Test data corresponding to the angular frequency could be obtained after DMA tests. According to the literature[Yang Tingqing. Theory of Viscoelasticity. 1990, Wuhan: Huazhong University of Science & Technology Press; Christensen R. M. THEORY OF VISCOELASTICITY-AN INTRODUCTION. 1982, New York: Academic Press; Emri I., von Bernstorff B. S., Cvelbar R., Nikonov A. Re-examination of the approximate methods for interconversion between frequency- and time-dependent material functions. Journal of Non-Newtonian Fluid Mechanics, 2005, 129 (2): 75-84.], transformation between angular frequency and time was implemented, and the master curve of HDPE relaxation modulus with respect to 20℃ was obtained. The generalized Maxwell model was used to fit the data, to form the functional relationship between relaxation modulus and time.