ASME 1993 Nadai Lecture - elastoplastic stress and strain concentrations

Article Abstract:

Evaluation of the efficiency of Glinka and Neuber models in predicting the elastoplastic stress and strain levels in structures by determining the biaxial strains using a laser-based method indicates that Neuber model and the Glinka model yield good results when the local region has plane stress and plane strain, respectively. A new method proposed for predicting the strains and stresses involves the determination of initial elastic strains and then the selection of a suitable model to calculate the strains and stresses depending on the level of elastic constraint.

Evaluation, Simulation methods, Simulation

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Viscoplastic behavior of a notch root at 650 degrees celsius: ISDG measurement and finite element modeling

Article Abstract:

An extended Interferometric Stain/Displacement Gage technique (ISDG) incorporates the finite element model to assess the viscoplastic properties of the nickel-based superalloy, Inconel 718, at 650 degrees centigrade. The ISDG method measures the biaxial strains for short gage lengths at the notch root. The measured strains from the ISDG data analyze the three-dimensional Bodner-Partom model used in the finite element software ABAQUS. The model simulates the cyclic response, positive rate sensitivity and creep behavior at the notch root.

Usage, Strain gages, Finite element method, Heat resistant alloys, Superalloys

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ASME 1995 Nadai Lecture - plasticity of porous and particulate materials

Article Abstract:

A consecutive equation is formulated for materials such as cement, geomaterials, and ceramics on the basis of irreversible volume changes. The concept of compressibility/dilatancy boundary is important in these porous and particulate materials. The experimental results show the importance of time effects on irreversible volumetric changes and failures. The model predictions are found to be in agreement with the experimental data. Applications of the model to mining engineering problems are presented.

Plasticity, Porous materials, Differential equations, Partial, Partial differential equations

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