Numerical and experimental study of an interference fitted joint using a large deformation Chaboche type combined isotropic–kinematic hardening law and mortar contact method

Mohammadpour, A.; Chakherlou, T.N.

doi:10.1016/j.ijmecsci.2015.10.012

Cited by 16 publications

(17 citation statements)

References 70 publications

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“…In this study, all specimens made from Al alloy 2024-T3 which was a bare sheet and the mechanical properties and chemical composition of this alloy are tabulated in Table 1. A specially designed fixture was used to perform the stress-controlled cyclic test in double shear lap joint, which is based on the previous experimental and modeling activities in our working group 35,36 and made from Al-alloy 7075-T6 (see Figure 2). A specially designed fixture was used to perform the stress-controlled cyclic test in double shear lap joint, which is based on the previous experimental and modeling activities in our working group 35,36 and made from Al-alloy 7075-T6 (see Figure 2).…”

Section: Methodsmentioning

confidence: 99%

“…A surface to surface contact is defined between the hole inner face and the tapered pin, and also between the fastener pin and the holes of the plates and a friction coefficient of 0.1 35,36 was used between the contact pairs. A surface to surface contact is defined between the hole inner face and the tapered pin, and also between the fastener pin and the holes of the plates and a friction coefficient of 0.1 35,36 was used between the contact pairs.…”

Section: Asymmetrical Stress Cycling Of Cold Expanded Specimensmentioning

confidence: 99%

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Experimental and numerical analyses of mean stress relaxation in cold expanded plate of Al‐alloy 2024‐T3 in double shear lap joints

Abdollahi

Chakherlou

2018

Fatigue Fract Eng Mat Struct

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In this paper, the mean stress relaxation behavior of simple Al‐alloy 2024‐T3 specimens and also the mean stress relaxation around the hole of cold expanded specimen are studied. The analyses are performed through the combination of the nonlinear isotropic hardening and Chaboche nonlinear kinematic hardening model accompanied by the results of experimental tests. The strain‐controlled axial tests are performed at two different strain amplitudes, while the stress‐controlled tests of cold expanded specimens are performed for three different imposed load amplitudes. The constitutive equations of the hardening model are coded as a UMAT subroutine in FORTRAN programming language and implemented in the commercial finite element code of ABAQUS. The accuracy of the hardening model has been proved in two steps: first by simulations of mean stress relaxation during the uniaxial strain‐controlled cyclic tests and second by simulation of strain ratcheting during the stress‐controlled cyclic loading. The stress and strain distributions after cold expansion process are examined as well as the mean stress relaxation due to cyclic loading. The results show the influences of imposed stress amplitude on increasing mean stress relaxation and also the effect of cold expansion level on reducing the mean stress relaxation.

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Section: Methodsmentioning

confidence: 99%

Section: Asymmetrical Stress Cycling Of Cold Expanded Specimensmentioning

confidence: 99%

Experimental and numerical analyses of mean stress relaxation in cold expanded plate of Al‐alloy 2024‐T3 in double shear lap joints

Abdollahi

Chakherlou

2018

Fatigue Fract Eng Mat Struct

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“…As a matter of fact cyclic hardening or softening of materials stabilised during the initial cycles of loading. Nevertheless, on the basis of the previous experimental tests it was illustrated that Al‐alloy 2024‐T3 exhibits significant cyclic hardening and so in this study the isotropic hardening feature considered in the constitutive models. The isotropic hardening is defined by an exponential law as follows:

σ^{0} = σ_{0} + Q_{\infty} ((),, 1 - e^{- italicbdp})

where σ 0 is the yield stress at zero plastic strain and Q ∞ and b are material parameters, which give an exponential shape to the uniaxial stress‐strain curve, which saturates with increasing plastic strain.…”

Section: Constitutive Modelling: Cyclic Plasticitymentioning

confidence: 93%

“…A comprehensive plasticity model should be able to predict the following phenomena: Bauschinger effect, hardening/softening behaviour, mean stress relaxation, strain ratcheting, and load history memory. Considering the importance of strain ratcheting in fatigue life of mechanical joints, special emphases have been given to this issue, and many constitutive equations have been developed for ratcheting response simulations. In this study the Chaboche kinematic hardening models 1986 (3 decomposed rules) and 1991 (fourth rule with a threshold) used for analysing the strain ratcheting behaviour of Al‐alloy 2024‐T3 sheets.…”

Section: Constitutive Modelling: Cyclic Plasticitymentioning

confidence: 99%

“…The local raised stress and strain around the holes are the main factor to early fatigue crack initiation and propagation. To overcome this disadvantage and strengthen the joint parts, different techniques of cold expansion, interference fit, bolt clamping, and a combination of them were offered in the past years. Cold expansion technique introduces compressive residual stresses around the perimeter of the hole by inserting an oversized tapered pin or mandrel into the hole from one side and pulling out from the other side.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental study of ratcheting in cold expanded plate ofAl‐alloy 2024‐T3 in double shear lap joints

Abdollahi

Chakherlou

2017

Fatigue Fract Eng Mat Struct

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In this paper strain ratcheting in cold expanded flat plate of Al-alloy 2024-T3 in double shear lap joints was studied both experimentally and numerically. In the experimental part, two types of symmetric strain-controlled and asymmetric stress-controlled cyclic tests were performed. Also, the cold expanded double shear lap joints subjected to cyclic stress-controlled tests. The required parameters for simulating the cyclic plastic behaviour of Al-alloy 2024-T3 were obtained on the basis of the experimental responses. In the numerical part, a combination of nonlinear isotropic and nonlinear kinematic hardening model (Chaboche) was implemented in the commercial finite element code of ABAQUS, using the subroutine UMAT written in FORTRAN. The results of simulations give an accurate prediction of ratcheting for all types of loading. The obtained results show that increasing the mean stress increases the strain ratcheting. It is clearly shown that the cold expansion process decreases the magnitude of strain ratcheting remarkably compared with "as drilled" specimens and the decrease is bigger for larger cold expansion sizes.Also, it is shown that the middle plane has the highest amount of ratcheting compared to the pin entrance plane and exit plane of the plate hole.

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Identification of Chaboche–Lemaitre combined isotropic–kinematic hardening model parameters assisted by the fuzzy logic analysis

Wójcik

Skrzat

2020

Acta Mech

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A very good knowledge of material properties is required in the analysis of severe plastic deformation problems in which the classical material processing methods are accelerated by the application of the additional cyclic load. A general fuzzy logic-based approach is proposed for the analysis of experimental and numerical data in this paper. As an application of the fuzzy analysis, the calibration of Chaboche–Lemaitre model hardening parameters of PA6 aluminum is considered here. The experimental data obtained in a symmetrical strain-controlled cyclic tension–compression test were used to estimate the material’s hardening parameters. The numerically generated curves were compared to the experimental ones. For better fitting of numerical and experimental results, the optimization approach using the least-square method was applied. Unfortunately, commonly accepted calibration methods can provide various sets of hardening parameters. In order to choose the most reliable set, the fuzzy analysis was used. Primarily selected values of hardening parameters were assumed to be fuzzy input parameters. The error of the hysteresis loop approximation for each set was used to compute its membership function. The discrete value of this error was obtained in the defuzzification step. The correct selections of hardening parameters were verified in ratcheting and mean stress relaxation tests. The application of the fuzzy analysis has improved the convergence between experimental and numerical stress–strain curves. The fuzzy logic allows analyzing the variation of elastic–plastic material response when some imprecisions or uncertainties of input parameters are taken into consideration.

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Numerical and experimental study of an interference fitted joint using a large deformation Chaboche type combined isotropic–kinematic hardening law and mortar contact method

Cited by 16 publications

References 70 publications

Experimental and numerical analyses of mean stress relaxation in cold expanded plate of Al‐alloy 2024‐T3 in double shear lap joints

Experimental and numerical analyses of mean stress relaxation in cold expanded plate of Al‐alloy 2024‐T3 in double shear lap joints

Numerical and experimental study of ratcheting in cold expanded plate ofAl‐alloy 2024‐T3 in double shear lap joints

Identification of Chaboche–Lemaitre combined isotropic–kinematic hardening model parameters assisted by the fuzzy logic analysis

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