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The application of Chaboche model in uniaxial ratcheting simulations

Wójcik Marta, Skrzat A.

Advances in Manufacturing Science and Technology

2020

Vol. 44, nr 2

57--61

This article presents the application of Chaboche nonlinear kinematic hardening model in simulations of uniaxial ratcheting. First, the symmetrical strain-controlled cyclic tension/compression tests for PA6 aluminum samples were done. Using the experimental stress–strain curve, initial material hardening parameters were determined by the ABAQUS software. The experimental curve was compared with the numerical one. For better fitting of both curves, the optimization procedure based on the least-square method was applied. Using the determined hardening parameters, numerical simulations of the ratcheting were done by the finite element analysis software. Numerical results were then compared with the experimental data obtained in the stress-controlled cyclic loading test.

An alternative material model using a generalized J2 finite-strain flow plasticity theory with isotropic hardening

Ecsi L., Elesztos P.

International Journal of Applied Mechanics and Engineering

2018

Vol. 23, no. 2

339--353

In this paper an alternative material model using a generalized J2 finite-strain flow plasticity theory with isotropic hardening is presented. The model is based on a new nonlinear continuum mechanical theory of finite deformations of elasto-plastic media which allows for the development of objective and thermodynamically consistent material models. As a result, the constitutive equation, the evolution equation and even the ‘normality rule’, characterising the plastic flow in the material during return mapping, can be expressed in various forms, using several instances of the yield surface and corresponding pairs of stress measures and strain rates, respectively, which are conjugate with respect to the internal mechanical power and its arbitrary higher order time derivative. Therefore the results of the material model when used in numerical analyses are not affected by the description and particularities of the material model formulation. Here, we briefly outline the nonlinear continuum theory along with a detailed description of the material model and finally present the model in a numerical example using a cross-shaped specimen in biaxial tension.

Modelling of isotropic and kinematic hardening in porous materials

Pokorska I.

Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo

2004

Z. 10 (158)

143-156