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<p>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&#xa0;years natural aging and elucidates four different measures of the strain rate sensitivity of the flow stress, <i>m</i>, 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 <i>m</i> for forming is supported by comparing simulated and experimental forming limit diagrams.</p>

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Rate Your Sensitivity—The m’s Have It

  • 期刊论文

  • 发表日期：

    2025年2月2日

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  • Bradley J. Diak,
  • Shigeo Saimoto

摘要

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.