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<p>High-strength 7075 aluminum (AA7075) sheets are widely employed in the aerospace sector and hold significant potential for further reducing vehicle weight. However, the ductile fracture of AA7075 sheets commonly involves the localization of inelastic deformation into narrow bands of intense straining. Despite its practical importance, the underlying mechanisms governing the anisotropic strain localization behavior in AA7075 sheets under uniaxial loading remain unclear. To address this gap, the present study integrates experimental characterization, theoretical analysis, and finite element (FE) simulations to investigate the influence of plastic anisotropy on the strain localization of AA7075-T6 sheets under quasi-static uniaxial loading. The orthotropic plasticity of the material was characterized using Barlat’s YLD11-27p yield criterion, which accurately captured both the yield behavior and the plastic strain rate direction. Experimental results demonstrated that the strain localization of the material is highly sensitive to the loading direction. Theoretical calculations and numerical simulations effectively reproduced the main experimental trends, with the predicted orientations of localization bands showing good agreement with experimental data (within an overall relative inclination range of ± 10°). Furthermore, the numerical results revealed that the orientations and patterns of localization bands vary significantly with the loading direction, closely matching experimental observations. Notably, in addition to the rolling and transverse directions, four intermediate orientations (15.1, 27.5, 45.4, and 69.3°) were found to produce equally inclined bands. The identification of these multiple intermediate orientations broadens the current understanding of single off-axis orientations in metal sheets as predicted by Hill’s rigid-plastic analysis. Furthermore, it suggests a potential link between these intermediate orientations and the inhomogeneous deformation observed in sheet metal forming, such as complex earing profile trends in cylindrical cup-deep drawing. Overall, these findings underscore the critical role of material orthotropy in dictating the strain localization behavior of AA7075-T6 sheets, advancing fundamental understanding and providing practical insights for the design of lightweight components.</p>

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Mechanics of Anisotropic Strain Localization in High-Strength Aluminum Sheets under Uniaxial Tension

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • Tianyu Xu

摘要

High-strength 7075 aluminum (AA7075) sheets are widely employed in the aerospace sector and hold significant potential for further reducing vehicle weight. However, the ductile fracture of AA7075 sheets commonly involves the localization of inelastic deformation into narrow bands of intense straining. Despite its practical importance, the underlying mechanisms governing the anisotropic strain localization behavior in AA7075 sheets under uniaxial loading remain unclear. To address this gap, the present study integrates experimental characterization, theoretical analysis, and finite element (FE) simulations to investigate the influence of plastic anisotropy on the strain localization of AA7075-T6 sheets under quasi-static uniaxial loading. The orthotropic plasticity of the material was characterized using Barlat’s YLD11-27p yield criterion, which accurately captured both the yield behavior and the plastic strain rate direction. Experimental results demonstrated that the strain localization of the material is highly sensitive to the loading direction. Theoretical calculations and numerical simulations effectively reproduced the main experimental trends, with the predicted orientations of localization bands showing good agreement with experimental data (within an overall relative inclination range of ± 10°). Furthermore, the numerical results revealed that the orientations and patterns of localization bands vary significantly with the loading direction, closely matching experimental observations. Notably, in addition to the rolling and transverse directions, four intermediate orientations (15.1, 27.5, 45.4, and 69.3°) were found to produce equally inclined bands. The identification of these multiple intermediate orientations broadens the current understanding of single off-axis orientations in metal sheets as predicted by Hill’s rigid-plastic analysis. Furthermore, it suggests a potential link between these intermediate orientations and the inhomogeneous deformation observed in sheet metal forming, such as complex earing profile trends in cylindrical cup-deep drawing. Overall, these findings underscore the critical role of material orthotropy in dictating the strain localization behavior of AA7075-T6 sheets, advancing fundamental understanding and providing practical insights for the design of lightweight components.