Quasi-static and dynamic response of AA-2219-T87 aluminium alloy

Nath, S and Konkati, C and Gupta, RK and Chauhan, A (2024) Quasi-static and dynamic response of AA-2219-T87 aluminium alloy. In: Materials Today Communications, 38 .

PDF mat_tod_com_38_2024.pdf - Published Version Restricted to Registered users only Download (11MB)

Abstract

Quasi-static and high-strain rate uniaxial compression testing on AA-2219-T87 aluminium alloy were carried out under varying strain rates (ranging from 1�10�3 to 7�103 s�1) and temperatures. Quasi-static testing showcased no strain-rate sensitivity (SRS) at room temperature, while positive SRS was observed at elevated temperatures (180, 230, and 300°C), showcasing higher flow stress with an increase in strain rate. This temperature-dependent SRS is attributed to the typical activation of thermally activated processes, greater dynamic recovery, and reduced effectiveness of traditional strengthening mechanisms at higher temperatures. High-strain rate testing, performed using a Split Hopkinson pressure bar (SHPB), revealed no SRS across all tested temperatures (25, 180, and 230°C). At high-strain rates (>103), once the flow stress reaches a common flow stress, it undergoes either a steady state deformation or minor softening. This behaviour is explained by the interplay between strain hardening and thermal softening phenomena. Specifically, the formation of intense shear flow zones (including dynamic recrystallization) during impact loading at strain rates of 4�103 and 7�103 s�1 promoted thermal softening over strain hardening, resulting in flow stress levels similar to those observed at a strain rate of 1�103 s�1. The intense shear flow volume fraction increased with an increase in strain rate, which is linked to no SRS and higher strain at 4�103 s�1 and 7�103 s�1. The SHPB testing data was utilized to develop the constitutive Johnson-Cook model, enabling the determination of the plastic behaviour of the AA-2219-T87 alloy at high-strain rates and temperatures. These findings enhance our understanding of the alloy's mechanical response and provide valuable insights for optimizing its performance in high-strain-rate applications. © 2024 Elsevier Ltd

Item Type:	Journal Article
Publication:	Materials Today Communications
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Aluminum alloys; Bridge decks; Compression testing; Dynamic recrystallization; Plastic flow; Shear flow; Strain hardening; Stress analysis, 2219 aluminum alloys; AA 2219; AA-2219 aluminum alloy; Constitutive modeling; Dynamic impact loading; Dynamic impacts; Impact loadings; Quasi static response; Split Hopkinson pressure bars; Strain-rates, Strain rate
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	22 Apr 2024 10:22
Last Modified:	22 Apr 2024 10:22
URI:	https://eprints.iisc.ac.in/id/eprint/84661

Actions (login required)

View Item