Ratchetting under tension–torsion loadings: experiments and modelling

Portier, L.; Calloch, Sylvain; Marquis, Didier; Geyer, P.

doi:10.1016/s0749-6419(99)00056-x

Cited by 118 publications

(64 citation statements)

References 39 publications

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“…The purpose of this experiment was to provide sufficient data base under biaxial state of stress to establish the mechanical behavior austenitic stainless steel under biaxial fatigue loading. These data are further used for validating the mathematical models [3][4].…”

Section: Biaxial Experimentsmentioning

confidence: 99%

Biaxial Ratcheting Response of SS 316 Steel

Kumar

Rao²,

Chellapandi³

2010

AMM

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Abstract. Ratcheting is one of the challenging phenomena that needs to be investigated for the Fast breeder reactor (FBRs), to arrive at the optimum structural dimensions that are safe and yet do not have undue redundancy. Austenitic stainless steel is the principal structural material for Indian FBR. Preliminary assessment indicates that there is a need to demonstrate that the main load carrying vessel made of this material can provide sufficient safety margin against ratcheting under biaxial loading conditions. This exercise calls for carrying out many simulated experiments, particularly with biaxial tension torsion specimens to generate adequate data for developing robust constitutive models to predict ratcheting. Accordingly, many biaxial tension-torsion experiments for austenitic stainless steel pipes were conducted and the best results have been reported here. The mechanical behavior of this material has been reported for a given axial tensile stress superimposed with a given range of cyclic shear stress for many cycles of loading. Rectangular rosette is used for capturing the biaxial response. Important material responses like cyclic hardening and biaxial ratcheting have been experimentally observed. Maximum accumulation of 2700 µ axial strain has been observed for a loading condition of constant axial stress of 102 MPa super imposed with a cyclic variation of shear stress amplitude of 120 MPa over 2450 cycles. The amount of progressive accumulation of axial strain was found to be directly dependent on the number of cycles. The observed rate of axial strain accumulation found decreased with increase in number of cycles. All these results are presented in detail in this paper and important conclusions that are useful in modeling the observed behavior are discussed.

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Section: Biaxial Experimentsmentioning

confidence: 99%

Biaxial Ratcheting Response of SS 316 Steel

Kumar

Rao²,

Chellapandi³

2010

AMM

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“…An interesting study of predictive capacity of selected constitutive models in simulation of multiaxial ratcheting strain was presented by Bari and Hassan [8] who used the experimental data of Hassan and Kyriakides [34] from thin-walled tubes subjected to internal pressure and tension. The ratcheting effects for combined tension-torsion loading were studied experimentally by Portier et al [66] who also provided comparative analysis of predictions of several selected models. It was shown that for quantitative predictions of ratcheting strain, the number of material parameters increases and the model structure becomes complex.…”

Section: Introductionmentioning

confidence: 99%

Constitutive modeling of cyclic deformation of metals under strain controlled axial extension and cyclic torsion

Mróz

Maciejewski

2017

Acta Mech

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The present work provides a formulation of a constitutive model for metals with the aim to simulate cyclic deformation under axial extension or compression assisted by cyclic torsional (or shearing) straining of specified amplitude and frequency. Such a mode of deformation was recently implemented in technological processes such as extrusion, forging and rolling, cf. Bochniak and Korbel (Eng Trans 47:351-367, 1999, J Mater Process Technol 134:120-134, 2003, Philos Mag 93:1883-1913, 2013, Mater Sci Technol 16:664-674, 2000. The constitutive model accounting for combined hardening (isotropic-kinematic) with both hardening and recovery effects is presented and calibrated for several materials: pure copper, aluminum alloy (2024), and austenitic steel. The experimental data are used to specify model parameters of materials tested, and next the cyclic response for different shear strain amplitudes is predicted and confronted with empirical data. The constitutive model is developed in order to simulate technological processes assisted by cyclic deformation.

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“…Cyclic relaxation generally refers to the progressive mean stress relaxation caused by unsymmetric strain cycles in the plastic range, while ratcheting refers to the progressive accumulation of plastic strain caused by unsymmetric stress cycles in the plastic range. The problems 0307-904X/$ -see front matter Ó 2007 Elsevier Inc. All of cyclic relaxation and ratcheting have received considerable attention over the last two decades and the prediction of complex cyclic behavior by means of simple material models has up to now been still difficult to achieve [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Modeling and characterization of cyclic relaxation and ratcheting using the distributed-element model

Chiang

2008

Applied Mathematical Modelling

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Constitutive modeling of cyclic relaxation and ratcheting (cumulative inelastic deformation) is developed on the basis of the distributed-element model (DEM). Although the original DEM is capable of describing general, elastic-plastic behavior for cyclically stabilized materials, it has the inadequacy of not being able to account for the effect of cyclic relaxation and ratcheting. By introducing the nonlinear kinematic hardening rule proposed by Armstrong and Frederick into element behavior of the DEM, the model becomes effective in characterizing the behavior of cyclic relaxation and ratcheting. Validation of the modified DEM is conducted by simulating cyclic behavior of various metal materials, including CS 1018, heat-treated rail steel, and Grade 60 steel. The results show that the modified DEM demonstrates realistic behavior of materials in both uniaxial and biaxial cyclic relaxation and ratcheting. Furthermore, detailed investigation of element behavior in the model provides us with additional insight into complex behavior and characteristics of materials in cyclic relaxation and ratcheting.

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Ratchetting under tension–torsion loadings: experiments and modelling

Cited by 118 publications

References 39 publications

Biaxial Ratcheting Response of SS 316 Steel

Biaxial Ratcheting Response of SS 316 Steel

Constitutive modeling of cyclic deformation of metals under strain controlled axial extension and cyclic torsion

Modeling and characterization of cyclic relaxation and ratcheting using the distributed-element model

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