Characterization of the Lode = -1 Meridian on the Al-2024 Failure Surface for *MAT_224 in LS-DYNA ®
A key ingredient in the modeling of ductile fracture using *MAT_224 in LS-DYNA is the failure surface, a 3-D graphical representation of the equivalent plastic strain at failure as a function of stress triaxiality and Lode parameter. Ballistic impact experiments used to validate the existing *MAT_224 plasticity and failure models for 2024 aluminum reveal a strong trend of ductile fractures along the Lode = -1 meridian, a region currently underpopulated with experimental data. Exploiting a novel physical interpretation of the Lode = -1 meridian, several new experiments to populate this critical region are proposed and numerically simulated in LS-DYNA, based on adaptations of the standard ASTM quasi-static hemispherical punch test.
https://www.dynalook.com/conferences/14th-international-ls-dyna-conference/aerospace/characterization-of-the-lode-1-meridian-on-the-al-2024-failure-surface-for-mat_224-in-ls-dyna-r/view
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Characterization of the Lode = -1 Meridian on the Al-2024 Failure Surface for *MAT_224 in LS-DYNA ®
A key ingredient in the modeling of ductile fracture using *MAT_224 in LS-DYNA is the failure surface, a 3-D graphical representation of the equivalent plastic strain at failure as a function of stress triaxiality and Lode parameter. Ballistic impact experiments used to validate the existing *MAT_224 plasticity and failure models for 2024 aluminum reveal a strong trend of ductile fractures along the Lode = -1 meridian, a region currently underpopulated with experimental data. Exploiting a novel physical interpretation of the Lode = -1 meridian, several new experiments to populate this critical region are proposed and numerically simulated in LS-DYNA, based on adaptations of the standard ASTM quasi-static hemispherical punch test.
07-E_Aerospace_143.pdf
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