Temperature Dependence of the Elastic Constants

Modeling of the Effect of Temperature, Frequency, and Phase Transformations on the Viscoelastic Properties of AA 7075-T6 and AA 2024-T3 Aluminum Alloys

“…The initial decrease (as early as at RT) of the storage modulus with temperature for both AA 7075 and AA 2024 is explained by the dependence of the elastic moduli (i.e., the elastic stiffness constants) on temperature, which is a wellknown phenomenon for metals, and particularly for aluminum. [29][30][31][32][33] This decrease of the storage modulus has also been observed in AA 6061 and AA 6061-T6. [28] The experimental dynamic elastic moduli of AA 2024-T3 and pure Al at RT compare well to the elastic modulus data available in the literature (Figure 3), as expected since the contribution of the loss modulus is very small and frequency has very little effect at low temperatures.…”

“…[1,3,9,12,15,20,24,[29][30][31][32][33]46,47] Figure 7 shows the computed storage modulus compared to the experimental data for a test series on AA 2024-T3 at excitation frequencies of 100, 30, 10, 3, and 1 Hz. Figure 7 shows also the evolution of GPZ and h¢/S¢ concentration with temperature.…”

“…** The linear decrease of the storage modulus with temperature reflects the well-known temperature dependence of the elastic stiffness constants of metals. Particularly, according to the literature, [29][30][31][32] the static elastic (or Young's) moduli of pure Al and AA 2024 decreases linearly with temperature in the test temperature range. Deviations from this linear behavior were reported close to the absolute zero and above 573 K (300°C), far from the region of applicability of this model.…”

“…All data are experimental, except those from Varshni's models. [32] . **For the sake of model simplicity, for AA 7075, the third term on the r.h.s.…”

“…Although Fig. 3-Elastic modulus E (static and dynamic) vs temperature T. Static elastic modulus data were obtained from the literature for pure Al [29,30,32] and for AA 2024. [31] Dynamic elastic modulus was obtained from the literature for pure Al at 80 kHz [33] and from DMA tests for AA 2024-T3 and pure Al at 1 Hz.…”