Figure 7: Variation of strain hardening exponent with nominal strain rate. Figure 7 presents the variation of strain hardening exponent with the strain rate. The strain hardening exponent showed a similar strain rate dependency with the 0.2% proof stress and ultimate tensile strength. However, the increase in the strain hardening exponent was kept constant up to a strain rate of approximately 102s-1. The 5083-H112 alloy contains approximately twice magnesium element as compared to the 5052-H112 alloy: however strain rate dependency was similar. Figures 8 and 9 present the variation of elongation and reduction of area with strain rate. The elongation and reduction of area increase linearly with increasing strain rate. Although the strain rate dependency in elongation and reduction of area is negligible up to the strain rate of approximately 100s-1, the degree of rate sensitivity appears to increase rapidly for the higher strain rates. Elongation, ( %) El. 10 20 30 40 5083-H112 5052-H112 10-4 10-3 10 -2 10 -1 10 10 2 10 3 10 4 10 0 1 Reduction of area, (%) R.A. 0 40 80 100 20 60 5083-H112 5052-H112 10 -4 10-3 10 -2 10 -1 10 10 2 10 3 10 4 10 0 1 Figure 8: Variation of elongation with nominal strain rate. Figure 9: Variation of reduction of area with nominal strain rate. 0 0.2 0.4 0.5 5083-H112 5052-H112 n value, n 0.1 0.3 10-4 10 -3 10 -2 10 -1 10 10 2 10 3 10 4 10 0 1
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