Strain Rate Dependency of Tensile Properties Figures 5 and 6 show the 0.2% proof stress and ultimate tensile strength as a function of strain rate in the 5052-H112 and 5083-H112 alloys. Although strain rate sensitivity of the ultimate tensile strength is negligible up to the strain rate of approximately 102s-1, the degree of rate sensitivity appears to increase for the higher strain rates. Tanimura, et al. [8] reported that the aluminum alloys containing magnesium solute atoms showed the negative strain rate dependency at intermediate strain rate. However, the negative strain rate dependency could be scarcely recognized in this study. The 5083-H112 alloy shows higher strength than the 5052-H112 alloy. Under the same strain rate range, the 5083-H112 alloy showed a larger strain rate dependency compared with the 5052-H112 alloy. While the 5052-H112 alloy showed an increase in the ultimate tensile strength of approximately 31MPa in the strain rate range of 4×10-4 to 3×103s-1, that of the 5083-H112 alloy was approximately 43MPa. 100 200 300 400 10 -4 10-3 10-2 10-1 10 10 2 10 3 10 4 10 0 1 5083-H112 5052-H112 Stress, / MPa 100 200 300 400 5083-H112 5052-H112 10-4 10 -3 10 -2 10 -1 10 10 2 10 3 10 4 10 0 1 Stress, / MPa Figure 4: Typical stress-strain curves of the 5083-H112 alloy at various strain rates. Figure 3: Typical stress-strain curves of the 5052-H112 alloy at various strain rates. Figure 5: Variation of 0.2% proof stress with nominal strain rate. Figure 6: Variation of ultimate tensile strength with nominal strain rate. 0 100 200 450 0 5 1015202530 300 50 150 250 350 400 Stress, / MPa Strain, (%) =3000s-1 =0.0004s-1 =0.1s-1 0 50 100 350 0 5 10 15 20 30 150 200 250 300 400 450 =3000s-1 =0.0004s-1 =0.1s-1 Stress, / MPa Strain, (%) 25 =1000s-1 =1000s-1
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