Low cycle fatigue and ratcheting behavior of 35CrMo structural steel at elevated temperature

Zheng, Xiaotao; Wu, Kewei; Wang, W.; Yu, Jiangying; Xu, Jianmin; Ma, Linwei

doi:10.1016/j.nucengdes.2017.01.016

Cited by 40 publications

(15 citation statements)

References 24 publications

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“…This indicates that the proposed model can be well used to predict the damage behavior considering the notch effect. Taking into consideration the important effect of notch geometry on the degradation of HDPE pipes, the shakedown and low fatigue behavior of notched and virgin HDPE pipes will be further tested and evaluated in the following based on the approaches published in previous works [35,36,37,38,39] obviously. Moreover, the burst pressure remarkably decreases with the increment of the notch depth ratio.…”

Section: Damage Model Of Hdpe Pipes With Various Notchesmentioning

confidence: 99%

Burst Pressures of High-Density Polyethylene Pipes Considering the Notch Effect: Testing and Prediction

Zheng

Wang

Chen

2020

Journal of Testing and Evaluation

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：This work aims at testing and predicting burst pressures of HDPE pipes with various groove conditions. Four types of notches including U-type, V-type, L-Type (linear type) and R-type (rectangular type) with different depth ratios are discussed. A unified damage model is proposed to predict the damage behaviors of notched HDPE pipes for different notch shapes. Results indicate that the notch shape has an

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Section: Damage Model Of Hdpe Pipes With Various Notchesmentioning

confidence: 99%

Burst Pressures of High-Density Polyethylene Pipes Considering the Notch Effect: Testing and Prediction

Zheng

Wang

Chen

2020

Journal of Testing and Evaluation

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“…7 (a), including (I) ε r , the ratcheting deformation which contains elastic and plastic strains, loading from the lower-elastic limit to the peak stress; (II) ε c , which contains the creep strain generated during peak stress hold and a minor additional viscoplastic strain that is produced during the unloading process from peak stress to upper-elastic limit, In order to simplify the classification, the part of viscoplastic strain is considered as a continuation of creep. Previous works 40,41 have concluded that the viscoplasticity of materials has a contribution to creep during the loading and unloading stage; (III) ε re , the total recovery strain when stress unloads from the upper-elastic limit to the valley stress and then reload to the lower-elastic limit; and (IV) ε act , the actual increased deformation compared to the last adjacent cycle. As shown in Fig.…”

Section: Stress-strain Curvesmentioning

confidence: 99%

Cyclic creep behaviour and strain classification of a bainite 2.25Cr-1Mo steel at 455oC

Jiang

Ogunmola

Zhao

et al. 2020

Preprint

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Uniaxial static and cyclic creep tests are carried out on a bainite 2.25Cr-1Mo steel at 455°C. The dependence of cyclic response on varied unloading conditions is investigated, with unloading rates from 0.6 MPa/s to 39 MPa/s and the valley stress duration from 0 to 30 min. Fracture surfaces of each specimen are analysed by using a scanning electron microscopy, and a systematic classification of strain components under cyclic creep is proposed to determine the actual damage. The results indicate that, the fracture modes under static and cyclic creep conditions both have ductile features. Due to the effect of anelastic strain recovery, the strain accumulation rate under cyclic creep is significantly retarded as compared with static creep, and the unloading conditions apparently influence the behaviour of anelastic strain recovery. Moreover, a life prediction method for cyclic creep tests based on mean actual strain deducted recovery strain is proposed.

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“…In order to calculate the total strain range, the cyclic steady-state stress-strain relationship should be utilized. Considering the operating temperature has significant effect on the fatigue life [19], [20], temperature-dependent material properties are considered.…”

Section: Fig1 Load Histories Of the Pressurized Shellmentioning

confidence: 99%

A novel fatigue assessment approach by Direct Steady Cycle Analysis (DSCA) considering the temperature-dependent strain hardening effect

Zheng

Chen

et al. 2019

International Journal of Pressure Vessels and Piping

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The traditional Low Cycle Fatigue (LCF) evaluation method is based on elastic analysis with Neuber's rule which is usually considered to be over conservative. However, the effective strain range at the steady cycle should be calculated by detailed cycle-by-cycle analysis for the alternative elastic-plastic method in ASME VIII-2, which is obviously time-consuming. A Direct Steady Cycle Analysis (DSCA) method within the Linear Matching Method (LMM) framework is proposed to assess the fatigue life accurately and efficiently for components with arbitrary geometries and cyclic loads. Temperature-dependent stress-strain relationships considering the strain hardening described by the Ramberg-Osgood (RO) formula are discussed and compared with those results obtained by the Elastic-Perfectly Plastic (EPP) model. Additionally, a Reversed Plasticity Domain Method (RPDM) based on the shakedown and ratchet limit analysis method and the DSCA approach within the LMM framework (LMM DSCA) is recommended to design cyclic load levels of LCF experiments with predefined fatigue life ranges.

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Low cycle fatigue and ratcheting behavior of 35CrMo structural steel at elevated temperature

Cited by 40 publications

References 24 publications

Burst Pressures of High-Density Polyethylene Pipes Considering the Notch Effect: Testing and Prediction

Burst Pressures of High-Density Polyethylene Pipes Considering the Notch Effect: Testing and Prediction

Cyclic creep behaviour and strain classification of a bainite 2.25Cr-1Mo steel at 455oC

A novel fatigue assessment approach by Direct Steady Cycle Analysis (DSCA) considering the temperature-dependent strain hardening effect

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