Experimental observations of evolving yield loci in biaxially strained AA5754-O

Iadicola, Mark A.; Foecke, Timothy J.; Banovic, Stephen W.

doi:10.1016/j.ijplas.2008.03.003

Cited by 69 publications

(42 citation statements)

References 20 publications

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“…It also exhibits discontinuous yielding of the Porte´vin-Le Chaˆtlelier (PLC) type (i.e., PLC banding) that has been characterized in the literature. [23][24][25][26] As reported by The Aluminum Association (Arlington, VA), AA5754 typically contains 2.8 pct mass fraction Mg for solid-solution strengthening and approximately 0.5 pct mass fraction Mn for grain refinement and stability. [27] Metallographic examination revealed that the grain structure was relatively equiaxed in the rolling plane and slightly elongated along the rolling direction (RD) of the sheet.…”

Section: A Materialsmentioning

confidence: 99%

“…This more general study includes detailed characterizations of the relative changes that occur in the crystallographic texture with strain level in the same three in-plane strain modes, [22] the parametric analyses of the relative influences of strain with the strain mode, [1] and the evolution of multiaxial flow surfaces. [23] The relationships among the individual elements of this general study will be presented in future studies.…”

Section: Introductionmentioning

confidence: 99%

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A Study of the Fundamental Relationships between Deformation-Induced Surface Roughness and Strain Localization in AA5754

Stoudt

Hubbard

Iadicola

et al. 2009

Metall Mater Trans A

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Three-dimensional, matrix-based statistical analysis methods were developed and integrated with high-resolution topographical imaging, to assess how microstructural changes influence the evolution of plastic deformation and strain localization in a commercial AA5754-O aluminum sheet in three in-plane strain modes. Analysis of the raw surface data revealed that the general composition of the surface roughness was highly sensitive to strain mode and strain level. The microstructural conditions that promote strain localization were assessed by extending a profilebased surface roughness parameter (Rt) to matrix form. Both analyses revealed that different strain modes produce characteristic dissimilarities in the deformation at the grain level. The localization data can be well characterized with a two-parameter Weibull distribution, suggesting that strain localization is a stochastic process that can be modeled reliably with Weibull statistics. This study clearly demonstrates that an accurate and straightforward probabilistic expression that captures the microstructural subtleties produced by plastic deformation can be developed from rigorous analyses of raw topographic data. Because variations in surface morphology profoundly influence the reliability of the numerical models used to predict strain localization, incorporating expressions of this type could greatly enhance the accuracy of these models.

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Section: A Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study of the Fundamental Relationships between Deformation-Induced Surface Roughness and Strain Localization in AA5754

Stoudt

Hubbard

Iadicola

et al. 2009

Metall Mater Trans A

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“…Recent work by this research group has shown that this barrier is being overcome as multiaxial flow surfaces can be experimentally determined, out to failure of the sheet, using an in-situ X-ray diffraction technique. [2,3] Typically, in-plane anisotropy is seen in the mechanical response of rolled sheet, with different uniaxial behavior parallel and perpendicular to the rolling direction (Figure 1(a)). These effects are not limited to the uniaxial case, as shown in Iadicola et al [3] for AA5754-O sheet subjected to biaxial in-plane straining.…”

Section: Introductionmentioning

confidence: 99%

Textural Development of AA 5754 Sheet Deformed under In-Plane Biaxial Tension

Banovic

Iadicola

Foecke

2008

Metall Mater Trans A

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Crystallographic texture evolution was quantified as a function of biaxial strain level and strain path for AA5754-O sheet metal in an effort to provide a physical description of grain rotation resulting from in-plane stretching. Samples were incrementally deformed to near-failure in three strain states (equibiaxial, plane strain, and uniaxial modes) with the rolling direction (RD) and transverse direction (TD) of the sheet parallel to the major stress axis for the latter two cases. The macrotextures were measured using X-ray diffraction techniques. Results showed that for a given strain path similar deformation textures developed in the two material sets (RD-and TD-oriented samples), though the evolution of the deformed texture was not homogeneous over the entire strain range. These variations in orientation intensities were related to the feeder components found in the initial texture and the availability of these components to rotate toward the more stable orientations under the particular mode of deformation. The nonuniform texture development of the sheet along different directions appears to contribute to the anisotropic mechanical response of the sheet during stretching as measured in the evolving multiaxial flow surfaces.

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“…In response, NIST has leveraged an ASTM springback test 15 and outfi tted forming equipment with x-ray-based instrumentation to measure stresses in sheets as they are shaped under actual manufacturing conditions. 16 This work has provided time-saving measurement data and predictive models to automotive manufacturers and associations including Ford, General Motors, Volvo, and the United States Council for Automotive Research, as well as sheet metal manufactures such as Alcoa and U.S. Steel.…”

Section: Automotive Lightweightingmentioning

confidence: 99%