Cyclic uniaxial and multiaxial loading with yield surface distortion consideration on prediction of ratcheting

Rokhgireh, H.; Nayebi, A.

doi:10.1016/j.mechmat.2012.01.005

Cited by 15 publications

(8 citation statements)

References 31 publications

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“…229,230 As the plastic strain increment is normal to the yield surface, a realistic modelling of the yield surface is essential in plastic strain field to accurately define ratcheting progress in materials. The simple model of Baltov and Sawczuk 233 was employed by Rokhgireh and Nayebi 234 to simulate ratcheting of steel alloys at various loading paths under stress-and strain-controlled conditions. In their study, the inclusion of YSD over the process of plastic deformation resulted in a better prediction of ratcheting.…”

Section: Kinematic Hardening Models Coupled With Yield Surface Distmentioning

confidence: 99%

“…In their study, the inclusion of YSD over the process of plastic deformation resulted in a better prediction of ratcheting. The simple model of Baltov and Sawczuk 233 was employed by Rokhgireh and Nayebi 234 to simulate ratcheting of steel alloys at various loading paths under stress-and strain-controlled conditions. While the Baltov-Sawczuk model looks promising, it failed to account for yield surface evolution properly resulting in a nosed shape over forward and reverse loading directions.…”

Section: Kinematic Hardening Models Coupled With Yield Surface Distmentioning

confidence: 99%

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Ratcheting in pressurized pipes and equipment: A review on affecting parameters, modelling, safety codes, and challenges

Varvani‐Farahani

Nayebi

2018

Fatigue Fract Eng Mat Struct

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The current study has attempted to comprehensively review ratcheting response of materials involving various influential parameters such as loading spectra, thermal cycles, stress levels, stress raisers, strain rate, and visco‐plasticity and material types with a focus on pressurized pipes and equipment. The mechanism of deformation, types, and the rate of progress over stages of ratcheting were discussed. Safety design codes and procedures were highlighted for reliable design of pressurized pipes against progressive ratcheting and to safeguard the system against catastrophic failure at which both mechanical and thermal ratcheting were integrated. Boundaries and demarcation of ratcheting‐shakedown zones developed based on Bree's diagram were employed to assess plastic deformation accumulation over stress cycles. Shakedown and ratcheting boundaries were discussed through methods developed on the basis of Melan's theorem over last few decades. Ratcheting response of materials was reviewed through descriptions of parametric models and kinematic hardening rules involving various variables and parameters. Interaction of ratcheting with creep and low‐cycle fatigue has promoted progressive damage in materials. Pressurized pipes subjected to thermal cycles and external bending cycles were evaluated by numerical solutions along with kinematic hardening rules to assess ratcheting over stress cycles.

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Section: Kinematic Hardening Models Coupled With Yield Surface Distmentioning

confidence: 99%

Section: Kinematic Hardening Models Coupled With Yield Surface Distmentioning

confidence: 99%

Ratcheting in pressurized pipes and equipment: A review on affecting parameters, modelling, safety codes, and challenges

Varvani‐Farahani

Nayebi

2018

Fatigue Fract Eng Mat Struct

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“…In the present study, the material properties of FGM pipe including thermal, mechanical and Chaboche hardening parameters are assumed to be temperature independent and vary along radius (just Poisson's ratio keeps constant) in accordance with a power-law distribution. For the two adopted designs of the FG pipe made with the outer or inner surfaces of full 1026 carbon steel, material properties are defined in Equations (9) and (10), respectively, as:…”

Section: Gradation Relationsmentioning

confidence: 99%

“…Wang et al [9] experimentally investigated cyclic elastic-plastic behaviors of homogeneous pipes submitted to internal pressure, bending and transverse load controls. Rokhgireh and Nayebi [10] used the yield surface distortion rule of Baltov combined with the Chaboche nonlinear kinematic hardening model to predict cyclic behaviors of metals subjected to multiaxial and uniaxial loading conditions. Duarte et al [11] experimentally investigated the cyclic behavior of short steel pipes filled with three different concrete mixtures.…”

Section: Introductionmentioning

confidence: 99%

Influences of Material Variations of Functionally Graded Pipe on the Bree Diagram

et al. 2020

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The present research is concerned with the elastic–plastic responses of functionally graded material (FGM) pipe, undergoing two types of loading conditions. For the first case, the FGM is subjected to sustained internal pressure combined with a cyclic bending moment whereas, in the second case, sustained internal pressure is applied simultaneously with a cyclic through-thickness temperature gradient. The properties of the studied FGM are considered to be variable through shell thickness according to a power-law function. Two different designs of the FGM pipe are adopted in the present research, where the inner surface in one case and the outer surface in the other are made from pure 1026 carbon steel. The constitutive relations are developed based on the Chaboche nonlinear kinematic hardening model, classical normality rule and von Mises yield function. The backward Euler alongside the return mapping algorithm (RMA) is employed to perform the numerical simulation. The results of the proposed integration procedure were implemented in ABAQUS using a UMAT user subroutine and validated by a comparison between experiments and finite element (FE) simulation. Various cyclic responses of the two prescribed models of FGM pipe for the two considered loading conditions are classified and brought together in one diagram known as Bree’s diagram.

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“…To model the ratcheting strain, Rokhgireh and Nayebi [27] combined the Baltov-Sawczuk yield surface distortion model with Chaboche's three decomposed rules. They applied the combined model to uniaxial and multiaxial cyclic loading experiments and found that consideration of yield surface distortion produces well compared results in ratcheting simulation.…”

Section: Introductionmentioning

confidence: 99%

Predicting the ratcheting strain of 304 stainless steel by considering yield surface distortion and using a viscoplastic model

Ahmadi

Nayebi

2015

J Mech Sci Technol

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Yield surface distortion and its center movement were employed in a unified viscoplastic model to predict the ratcheting behavior of the 304 stainless steel. A combination of the Ohno-Wang model and the yield surface distortion model of Baltov and Sawczuk was used in uniaxial loading. Stress amplitude and the mean stress were varied in the tests to verify the model. Uniaxial loadings were simulated with and without consideration of yield surface distortion. Results from both simulations were compared. Yield surface distortion showed a significant effect on the simulation of the ratcheting responses.

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Cyclic uniaxial and multiaxial loading with yield surface distortion consideration on prediction of ratcheting

Cited by 15 publications

References 31 publications

Ratcheting in pressurized pipes and equipment: A review on affecting parameters, modelling, safety codes, and challenges

Ratcheting in pressurized pipes and equipment: A review on affecting parameters, modelling, safety codes, and challenges

Influences of Material Variations of Functionally Graded Pipe on the Bree Diagram

Predicting the ratcheting strain of 304 stainless steel by considering yield surface distortion and using a viscoplastic model

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