Dynamic Strain Aging in AA5182 Alloys at a Wide Range of Temperatures

초록

The dynamic strain aging (DSA) on the mechanical behavior of AA5182 aluminum alloys is investigated through theoretical and numerical methods at a wide range of temperatures. This study proposes a physically-based constitutive model to explain the DSA-induced hardening of AA5182 aluminum alloys. This proposed constitutive model consists of two main components, athermal and thermal components. Between two main components, an athermal component contains an extra hardening caused by the DSA. To describe this hardening, a probability density function is introduced as a function of equivalent plastic strain, equivalent plastic strain rate, and temperature. The results show that this function can precisely describe characteristics of the DSA hardening. Experimental data obtained in the literature are utilized to examine the validity of the proposed model. Lastly, finite element (FE) solution for the proposed model is presented and validated by comparing with experimental data.

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