The Ratcheting Behaviour of Stainless Steel Pressurized Piping Elbows Subjected to Dynamic Out-of-Plane Moments

Zakavi, Seyed Javid; Nourbakhsh, Mohammad

doi:10.4236/mme.2014.43012

Cited by 11 publications

(7 citation statements)

References 37 publications

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“…Based on recent studies [10][11][12][13][14][15], the nonlinear Chaboche hardening model with isotropic hardening rule was studied on ratcheting strain of carbon steel elbows under cyclic bending moments without considering temperature effects. The results show that this hardening model is more accurate than the other models comparing with the experimental results (columns of 3 and 4 in Tables 6, 7, 8 and 9).…”

Section: Discussion In Numerical and Experimental Resultsmentioning

confidence: 99%

“…A simple procedure to identify all the material constants that arise in this theory from only one cyclic tensile test with controlled deformation is also presented. In recent studies [10][11][12][13][14][15], various hardening models were studied on ratcheting strain of carbon steel elbows under cyclic bending moments without considering temperature effects. The results show that the nonlinear Chaboche hardening model with isotropic hardening rule is more accurate than the other models comparing with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

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The ratcheting behavior of carbon steel piping elbows under cyclic bending moment and temperature

Zakavi

Aghaei

2020

J Braz. Soc. Mech. Sci. Eng.

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In this paper, the effect of temperature and out-of-plane dynamic moments on ratcheting behavior of pressurized elbows have been investigated. The combined hardening model (Chaboche kinematic hardening model with isotropic hardening rule) is used for the plastic analysis of materials. Piping elbow specimens had temperatures of 50, 100, 150 and 200 °C. By using of many tension-compression-stabilized tests of specimens under symmetric strain-controlled, constant parameters for materials are obtained. The results obtained by the FE method of specimens show that the deformations occurred mainly because of creep at high temperature and ratcheting strain by out-of-plane moments. Also, ratcheting rate increases by increasing moment bending and temperatures. Initial, strain accumulation rate is low, and it increases with the increasing temperatures, which express softening phenomenon due to thermal creep. The strain accumulation is highest along the hoop direction at flanks, similar to results from experimental data without considering temperature effects. The results show that the increase in ratcheting due to high temperature may lead to incontrollable damages to pipework structures. Of course, the prediction of strain accumulation is improved in the presence of isotropic hardening rule. Keywords Ratcheting • Elbow pipe • Out-of-plane bending moment • Temperature • Strain hardening List of symbols b, Q ∞ Materials constants for isotropic hardening 0 Yield stress at zero plastic strain p Plastic stress tensor p

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Section: Discussion In Numerical and Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The ratcheting behavior of carbon steel piping elbows under cyclic bending moment and temperature

Zakavi

Aghaei

2020

J Braz. Soc. Mech. Sci. Eng.

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“…49 Moreover, Q can be described as the maximum change in the size of the yield surface and b is introduced as changes of the yield surface with respect to the plastic strain increase. 51 It is worth noting that the strain hardening parameters to be introduced to the software (C, γ, Q, b, and σ 0) were firstly obtained from a similar research work, 52 and subsequently, simulations were performed based on these parameters. In the second step, the simulated ratcheting strains were compared to the experimental data.…”

Section: Numerical Analysismentioning

confidence: 99%

Experimental and numerical analysis of ratcheting behavior of A234 WPB steel elbow joints including corrosion defects

Moradi

Shariati

Zamani

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this paper, ratcheting behavior of intact and corroded 90o elbow pipe specimens of A234 WPB steel is investigated at intrados, crown, and extrados positions. A special fixture was designed and constructed to carry out the fatigue experiments. Then, the effects of fatigue loading parameters (mean and amplitude) and defect depth were examined on ratcheting responses of intact and corroded specimens at intrados, crown, and extrados positions. To simulate the ratcheting behavior of specimens, a finite element analysis was performed based on the combined nonlinear isotropic/kinematic hardening model. As a reasonable agreement was found between the finite element (FE) simulation results and experimental data, the influence of constant internal pressure during the cyclic loading was examined on ratcheting responses through FE simulation. Results indicated that decreasing the load amplitude was more effective on decreasing the ratcheting strain than that of the mean fatigue load. Moreover, the most critical ratcheting response was associated with the intrados location of the pipe. For defective specimens, decreasing fatigue loading parameters resulted in a shakedown behavior for a defect placed at extrados, while, for the defects at intrados and crown, an increasing behavior was observed for the ratcheting strain. It was revealed that, at extrados position, the ratcheting behavior was arrested up to 1 mm defect depth. The ratcheting strains were increased at intrados and crown by increasing the internal pressure, while they were decreased at extrados.

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“…Thus, it was essential to critically evaluate the widely used and recently developed constitutive models against their simulation capability of component responses for determining the state-of-the-art constitutive modeling features and future model development needs. Ratcheting strains of pressurized piping components such as elbow pipe and straight pipe with or without local wall thinning under cyclic loading, have been also studied by experiments and finite element analysis after 2013 [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Ratcheting behavior of pressurized corroded straight pipe subjected to cyclic bending

Chen

2019

Thin-Walled Structures

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The ratcheting behavior of pressurized corroded straight pipe subjected to cyclic bending is investigated using Chaboche model in the paper. The effects of defect length, depth and width and internal pressure on ratcheting strain are studied. The results show that the ratcheting strain increases with the increase of defect length L/D, depth H/T, circumferential length and internal pressure.Moreover, in order to analyze the effect of defect size on ratcheting strain of corroded straight pipe, calculation schemas are established according to orthogonal design method (ODM). Finally, dimensionless relations of both circumferential and longitudinal ratcheting strains to defect length, depth, width and internal pressure are established based on the multiple regression method.

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The Ratcheting Behaviour of Stainless Steel Pressurized Piping Elbows Subjected to Dynamic Out-of-Plane Moments

Cited by 11 publications

References 37 publications

The ratcheting behavior of carbon steel piping elbows under cyclic bending moment and temperature

The ratcheting behavior of carbon steel piping elbows under cyclic bending moment and temperature

Experimental and numerical analysis of ratcheting behavior of A234 WPB steel elbow joints including corrosion defects

Ratcheting behavior of pressurized corroded straight pipe subjected to cyclic bending

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