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Rate Your Sensitivity—The m's Have It.

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Title: Rate Your Sensitivity—The m's Have It.
Authors: Diak, Bradley J.1 (AUTHOR) diak@queensu.ca, Saimoto, Shigeo1 (AUTHOR)
Source: Metallurgical & Materials Transactions. Part A. Apr2025, Vol. 56 Issue 4, p1135-1149. 15p.
Subjects: Strains & stresses (Mechanics), Dislocation structure, Metal complexes, Microstructure, Deformations (Mechanics)
Abstract: The forming of sheets into automotive closure panels requires the uniform, uninterrupted flow of metal through complex strain rate paths before reaching a limit strain like necking. The sensitivity of the flow stress to the strain rate path can delay flow localization to failure and is undermined by the evolution of the dislocation structure and its atomistic controls, the latter which is the basis of alloy design. This work describes the constitutive deformation behavior of an Al–Mg–Si alloy typical for automotive closure panels in the T4 and after 32 years natural aging and elucidates four different measures of the strain rate sensitivity of the flow stress, m, how they are measured, and which one is important to understanding metal plasticity for automotive sheet forming and correlations to microstructure. The appropriate measure of m for forming is supported by comparing simulated and experimental forming limit diagrams. [ABSTRACT FROM AUTHOR]
Copyright of Metallurgical & Materials Transactions. Part A is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="JN" term="%22Metallurgical+%26+Materials+Transactions%2E+Part+A%22">Metallurgical & Materials Transactions. Part A</searchLink>. Apr2025, Vol. 56 Issue 4, p1135-1149. 15p.
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  Data: The forming of sheets into automotive closure panels requires the uniform, uninterrupted flow of metal through complex strain rate paths before reaching a limit strain like necking. The sensitivity of the flow stress to the strain rate path can delay flow localization to failure and is undermined by the evolution of the dislocation structure and its atomistic controls, the latter which is the basis of alloy design. This work describes the constitutive deformation behavior of an Al–Mg–Si alloy typical for automotive closure panels in the T4 and after 32 years natural aging and elucidates four different measures of the strain rate sensitivity of the flow stress, m, how they are measured, and which one is important to understanding metal plasticity for automotive sheet forming and correlations to microstructure. The appropriate measure of m for forming is supported by comparing simulated and experimental forming limit diagrams. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Metallurgical & Materials Transactions. Part A is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Dislocation structure
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