On the stability of biaxial stretching with application to the optimization of superplastic blow-forming

Article Abstract:

The instability of biaxial stretching of thin sheets of viscoplastic metals under plane stress conditions is studied utilizing a linear stability analysis. An instability criterion for biaxial stretching is developed assuming that localized necking starts along the direction perpendicular to the major principal stress direction. A decrease in forming time is accomplished in contrast with the established constant strain rate forming technique, while uniformity in the thickness distribution of the formed parts are maintained.

Analysis, Superplasticity, Superplastic forming (Metalwork), Superplastic forming

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On identification of material models when nonrepeatability of test data is present: Application to textile composites

Article Abstract:

The reliability of material parameters is connected to both qualitative and quantitative levels of identification. In the qualitative level, close attention has to be paid to construct constitutive equations based on the physics of the material. In the quantitative level, the model parameters are determined based on assumptions that analysis accept implicitly or explicitly during the identification process.

Composite materials, Mathematical analysis, Properties

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A presentation and comparison of two large deformation viscoelasticity models

Article Abstract:

A theory of finite deformation viscoelasticity is presented based on the multiplicative viscoelastic decomposition of Sidoroff. This was combined with the assumption of a viscoelastic potential, providing a model similar to finite associative elasto-plasticity. The model is used as an alternative formulation in examples of uniaxial plane strain relaxation and creep.

Research, Materials, Viscoelasticity, Creep (Materials)

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