A Plasticity Formulation for Cyclic Inelastic Structural Analysis.
CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN ILL
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A critical review of current inelastic structural analysis procedures indicates that the material constitutive models presently in use do not adequately reflect the materials cyclic inelastic properties. This will result in erroneous evaluation of deformation response and energy dissipation in structures subjected to dynamic loadings. This report presents a plasticity formulation which is capable of simulating all the important features of material properties observed under cyclic uniaxial loading. Appropriate cyclic material properties required for characterizing the combined isotropic-kinematic hardening features of this formulation are defined. These properties are determined from simple cyclic uniaxial tests. The formulation uses Mrozs concept of multiple and nesting hypersurfaces in stress space to simulate the memory of prior history it eliminates the need for classifying a general loading path into a plastic loading or a plastic load reversal for cyclic analysis. The superiority of this formulation over currently available methods is demonstrated. Author