|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Late News Posters
||PP-31: Role of Negative Strain Rate Sensitivity(NSRS) in Failure of Aluminum Alloy 2024: Experiments and Constitutive Modeling
||Satyapriya Gupta, Armand Beaudoin
|On-Site Speaker (Planned)
NSRS leading to the strain localization and ultimately failure of material has been one of the greatest challenge in the efficient usage of the Al alloys. NSRS in Al-Cu alloy (AA2024) is investigated with the help of uniaxial tension and jump tests performed at different strain rates and test temperatures. A non-contact strain mapping technique, digital image correlation (DIC) is adopted to locate the creation and movement of the heterogeneities such as shear bands. Strain controlled jump tests in combination with DIC is proved to be an excellent tool to investigate NSRS in the alloy. Localized response causing NSRS for this alloy could only be observed during the jumps of the strain rate. Limited information obtained from the experiments motivated us for modeling the phenomenon with the help of already existing phenomenological mesoscopic field dislocation mechanics (PMFDM) model where a dynamics strain aging (DSA) module is added in the formulation.