Ratcheting Behavior of T225NG Titanium Alloy under Uniaxial Cyclic Stressing: Experiments and Modeling

Liu, Cai; Niu, Qingyong; Qiu, Shaoyu; Liu, Yujie

doi:10.1016/s1000-9361(11)60279-3

Cited by 6 publications

(10 citation statements)

References 5 publications

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“…27,183 The present section focuses on the phenomenological models developed to assess ratcheting of components undergoing asymmetric load cycles. 21 Cai et al 27,183 defined ratcheting strain as a function of maximum and minimum strains (ε max , ε min ) and the corresponding loading and reloading stresses as σ L and σ R , respectively. 18,21,184 Analogous to creep phenomenon, the stages of ratcheting as illustrated in Figure 2 expand over life cycles.…”

Section: Figure 18mentioning

confidence: 99%

“…Ratcheting strain increases gradually till specimen fails in subsequent cyclic period. Type III of ratcheting is defined for those cases at which ratcheting strain rate declines quickly to a certain value and then goes up rapidly leading specimen to failure 27 For transient/steady ratcheting types, material properties vary with stress cycles. In transient type, maximum plastic strain evolves during the first few cycles then the rate of ratcheting declines as stress cycles progress resulting in shakedown in stage II or ratcheting further increases with a constant slope as shown in Figure 2.…”

Section: Ratcheting Typesmentioning

confidence: 99%

“…Parametric equations have been structured based on the applied mean and amplitude of stresses, cyclic hardening or softening behaviours, and number of cycles. 27,183 The present section focuses on the phenomenological models developed to assess ratcheting of components undergoing asymmetric load cycles. Experimental evidences have supported triphasic response of ratcheting in engineering alloys.…”

Section: Figure 18mentioning

confidence: 99%

“…Beyond stage II, the third stage corresponded to a suddenly raised ratcheting progress and strain rate leading to failure. 21 Cai et al 27,183 defined ratcheting strain as a function of maximum and minimum strains (ε max , ε min ) and the corresponding loading and reloading stresses as σ L and σ R , respectively.…”

Section: Figure 18mentioning

confidence: 99%

See 3 more Smart Citations

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: Figure 18mentioning

confidence: 99%

Section: Ratcheting Typesmentioning

confidence: 99%

Section: Figure 18mentioning

confidence: 99%

Section: Figure 18mentioning

confidence: 99%

See 2 more Smart Citations

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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“…studied, respectively, the ratcheting behavior of cancellous bone and articular cartilage under uniaxial cyclic compression and found that the stress variation and the stress rate were the key factors influencing ratcheting evolution. In terms of a prediction equation, Cai et al . proposed a universal ratcheting model (URM) to describe ratcheting strain evolution under arbitrary cyclic stress.…”

Section: Introductionmentioning

confidence: 99%

Ratcheting Behavior of Intervertebral Discs Under Cyclic Compression: Experiment and Prediction

Zhang

Gao

et al. 2019

Orthopaedic Surgery

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ObjectiveTo evaluate the ratcheting behavior of intervertebral discs (IVD) by experiments and theoretical study.MethodThe lumbar spines of sheep were obtained at a local slaughterhouse, and the IVD was processed with upper and lower vertebral bodies (about 5 mm) to ensure the mechanical state of the IVD in situ. The ratcheting tests of uniaxial cyclic compression loading for disc samples is carried out using the Electronic Universal Fatigue Testing System at room temperature. The effects of different stress variations, stress rates, as well as different segments on ratcheting behavior of discs were investigated.ResultsThe ratcheting strain evolution of lumbar IVD include stages of sharp increase and asymptotic stability. Both the ratcheting strain and ratcheting strain rate increase with an increase of stress variation (R = 0.962, P = 0.004) but decrease with an increase of the stress rate (R = −0.876, P = 0.019 ). Compression stiffness increases with an increase of the stress rate (R = 0.964, P = 0.004 ) or stress variation (R = 0.838, P = 0.037). Compared with L5 – 6, the L6 – 7 disc showed less ratcheting strain (P = 0.04 ), indicating that the disc at this segment was more resistant to the impact of the ratcheting cycle. In addition, ratcheting strain evolution was predicted using a ratcheting evolution constitutive equation, and the predicted results were in good agreement with experimental data.ConclusionsThe ratcheting behavior occurs in IVD, and this cumulative deformation is consistent with the general ratcheting behavior. The constitutive equation can predict the ratcheting strain evolution of IVD very well. These results are of great significance for the analysis of defects and the development of repair in IVD.

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Ratcheting and fatigue behavior of Eurofer97 at high temperature, part 1: Experiment

Zhang

Walter

Aktaa

2020

Fusion Engineering and Design

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Eurofer97 is considered as one of the structural material candidates for in-vessel components of future fusion reactor. Due to frequent startups, shutdowns and load changes in reactor, the material is under complex cyclic loadings. This work investigates the mechanical behavior of Eurofer97 under various cyclic loadings, including strain-controlled LCF tests and stress-controlled ratcheting tests at high temperatures 450°C and 550°C. Various influencing factors on ratcheting, such as stress magnitude, stress ratio and stress rate are evaluated. Since Eurofer97 is developed based on conventional grade 91 ferritic martensitic (FM) steels, corresponding data of mod.9Cr-1Mo FM steel P91 are also presented for comparison.

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Ratcheting Behavior of T225NG Titanium Alloy under Uniaxial Cyclic Stressing: Experiments and Modeling

Cited by 6 publications

References 5 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

Ratcheting Behavior of Intervertebral Discs Under Cyclic Compression: Experiment and Prediction

Ratcheting and fatigue behavior of Eurofer97 at high temperature, part 1: Experiment

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