The effect of low cycle fatigue, ratcheting and mean stress relaxation on stress–strain response and microstructural development in a dual phase steel

Paul, Surajit Kumar; Stanford, Nicole; Taylor, Alex; Hilditch, Tim

doi:10.1016/j.ijfatigue.2015.06.003

Cited by 68 publications

(19 citation statements)

References 29 publications

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“…They simulated ratcheting and stress relaxation through earlier theories and concluded that mean stress relaxation occurred in the service life of components with some degrees of uncertainty. Paul et al performed tests on dual phase steel samples to evaluate ratcheting and stress relaxation under asymmetric loading conditions. They observed prominent accumulation of directional strain over loading cycles and reported that microstructure has a significant influence as specimens undergo more in‐grain misorientation resulting in accumulated tensile strain.…”

Section: Introductionmentioning

confidence: 99%

“…Literature cites a number of experimental studies conducted to assess ratcheting and stress relaxation on metallic components by Morrow and Sinclair, Wetzel, Landgraf, Stadnick and Morrow, Jhansale and Topper, Koh and Stephens, Chiang, Arcari and Dowling, Paul et al, Rice et al, Hassan and Kyriakides, Hu et al, Wang and Rose, Rahman and Hassan, Lee et al, and Varvani et al Among first research endeavors in ratcheting and stress relaxation is a series of tests performed on 4340 steel samples under asymmetric zero‐to‐tension cycles in 1950s by Morrow and Sinclair . Stress relaxation in steel samples was stabilized in lower number of cycles as stress amplitude increased in magnitude.…”

Section: Introductionmentioning

confidence: 99%

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Concurrent ratcheting and stress relaxation at the notch root of steel samples undergoing asymmetric tensile loading cycles

Shekarian

Varvani‐Farahani

2019

Fatigue Fract Eng Mat Struct

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The current study intends to develop a framework model to assess ratcheting and stress relaxation at the notch root of 1045 steel samples over asymmetric loading cycles. The framework involves the Ahmadzadeh‐Varvani (A‐V) kinematic hardening rule to control ratcheting progress and Neuber rule to accommodate for local stress and strain components at the vicinity of notch root. Plastic strain at notch root was first coupled with its counterpart in the A‐V model to establish a relation between local stress and backstress components. Calculated local stress and strain values at turning points enabled the A‐V model to assess ratcheting strain over each loading cycle. The stepwise drop in stresses at peak‐valley tips of hysteresis loops at the notch root was associated to coupled framework of the A‐V model and Neuber rule through constancy in local strain while ratcheting progressed over each cycle. This relaxed out the local stresses at tips of hysteresis loops to position on Neuber hyperbolic curve. Predicted ratcheting values at notch root of various diameters closely agreed with those of measured in steel samples over stress cycles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Concurrent ratcheting and stress relaxation at the notch root of steel samples undergoing asymmetric tensile loading cycles

Shekarian

Varvani‐Farahani

2019

Fatigue Fract Eng Mat Struct

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“…Depending on the material hardening parameters (especially isotropic components), the plastic shakedown might occur after certain number of cycles. The theoretical information about the mean stress relaxation is contained in [47][48][49]. The change of strain in time for the mean stress relaxation test is shown in Figure 15.…”

Section: The Materials Modelmentioning

confidence: 99%

The Coupled Eulerian-Lagrangian Analysis of the KOBO Extrusion Process

Wójcik¹,

Skrzat²

2021

Adv. Sci. Technol. Res. J.

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The KOBO extrusion is an unconventional elastic-plastic deformation process in which the phenomenon of changing a path of plastic deformation due to die cyclic oscillations by a given angle and with a given frequency is applied. As the result of the application of the oscillating rotary motion of the die, the reduction of the extrusion force was obtained. The numerical study of the KOBO extrusion of metallic materials was presented in this paper. The three-dimensional coupled Eulerian-Lagrangian (CEL) analysis was applied. The relationship between the extrusion force and the punch displacement during the KOBO process was achieved. The effective plastic strain distribution in the butt was found. The results of the numerical computations were compared with the experimental data. The influence of the material hardening parameters on the cyclic loading phenomena (ratcheting, mean stress relaxation) in terms of the course of the KOBO extrusion was also examined. The proper determination of the material hardening parameters can help to optimize the KOBO process in terms of the reduction the extrusion force and the choice of the amount of die oscillations.

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“…The curves were applicable in finite element analysis; precise estimation could be worked out according to the calculated equivalent stress . Paul et al conducted the low cycle fatigue and mean stress relaxation experiment on dual phase steel. The cyclic softening behavior was observed, and it increased with increasing of strain amplitude.…”

Section: Introductionmentioning

confidence: 99%

Fatigue damage analysis of reinforced concrete column considering low‐cycle behavior of HRB400 steel

Xiao

Zhang

et al. 2019

Structural Design Tall Build

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In this study, a damage model-based fatigue behavior is proposed. To consider the fatigue behavior of steel in the damage model, the experimental research on reinforcing steel bar grades HRB400 was presented. The monotonic tension test and lowcycle fatigue test were carried out. The plastic strain amplitude-fatigue cycle (ε p -2N f ) curve and plastic strain amplitude-strength loss factor (ε p -ϕ SR ) curve were obtained. The fatigue parameters (C f , C d , and α) were proposed by nonlinear fitting.The specimens were simulated using the "Reinforcing Steel" material in "OpenSees"program. These fatigue parameters were proved to accurately describe the fatigue behavior of HRB400 rebar. Moreover, to verify the application of fatigue damage model in RC column, fiber-based element models were established based on the quasi-static cyclic test on RC columns. The calculated results agreed well with those of the tests. The damage degree of RC column was calculated by the recorded stressstrain curves of material. The proposed fatigue parameters could be referred in damage model based on material fatigue behavior. KEYWORDS damage index, low-cycle fatigue, numerical analysis, reinforcing steel bar, seismic behaviorThe current reinforced concrete (RC) structures such as bridge, crane beam, and high-rise buildings bear not only the static loading but also cyclic loading . [1,2] Structures experience deformations beyond the yielding stage in long-term situation. [3] This may lead to brittle failure characterized by insufficient utilization of material strength. [4,5] For taking full advantages of material mechanical properties in structural design, reliable methods to predict fatigue damage are recommend.Recently, various damage models for appraising structural performance state have been proposed. [6][7][8][9] Park-Ang gave the classical doubleparameter model, which depended on both of maximum deformation and hysteretic energy. [10] This model considered the interaction between accumulated damage and structural response. Guo et al. [11] extended the application of Park-Ang model to three-dimensional case; it was reliable in evaluating the damage under coupling of axial loading and bidirectional bending. Fu and Liu [12] took various displacement amplitudes and load sequence into account, whereas effective energy dissipation factor and load sequence factor were introduced. These works attempted to precisely quantify the damage degree. After that, the fatigue of material was found to influence damage degree, as the accumulated hysteretic energy and inelastic deformation resulted in the change of material mechanical properties. [13] Castillo et al. [14] generalized the Weibull model for predicting fatigue behavior at any stress level. The fatigue life of structure can be estimated by these fatigue damage model.It was concluded that the fatigue performance of structure was directly influenced by the fatigue behavior of reinforcement. [15] Zanuy et al. [16] conducted the fatigue test on RC box-girder bridges. The relationship between...

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The effect of low cycle fatigue, ratcheting and mean stress relaxation on stress–strain response and microstructural development in a dual phase steel

Cited by 68 publications

References 29 publications

Concurrent ratcheting and stress relaxation at the notch root of steel samples undergoing asymmetric tensile loading cycles

Concurrent ratcheting and stress relaxation at the notch root of steel samples undergoing asymmetric tensile loading cycles

The Coupled Eulerian-Lagrangian Analysis of the KOBO Extrusion Process

Fatigue damage analysis of reinforced concrete column considering low‐cycle behavior of HRB400 steel

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