Modeling of ratchetting in biaxial experiments

Article Abstract:

A mathematical model to explain progressive straining or ratchetting is given. The model uses an Armstrong-Frederick equation to reduce the experimental ratchetting rate obtained experimentally. The analysis is carried out on thin-walled cylinders which is subjected to an axial load and a torsion of constant amplitude. Results obtained agree with data from tests of 17-12 SPH austenitic stainless steel. The increase of ratchetting with hold times shows that the relaxed stress intensity varies with maximum stress but additional tests have to be made to confirm this observation.

Strains and stresses, Stresses (Materials)

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A phenomenological model for cyclic plasticity

Article Abstract:

A phenomenological model is suggested for cyclic plasticity based on the idea of distributed elements, which is capable of reflecting microstructural behavior of real materials under multiaxial cyclic loading conditions. By studying the detailed behavior of the model, various significant phenomena and effects of materials in cyclic plasticity can be elucidated. The model is also generalized to include cyclic hardening effects.

Materials

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Models for cyclic ratchetting plasticity-integration and calibration

Article Abstract:

This article discusses three different ratchetting models for metals to predict rachetting behavior of tension-torsion specimen using FE code ABAQUS.

Sweden, Statistical Data Included, Torsion, Metals, Hardening (Metalworking)

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