Investigation of extremely low cycle fatigue behavior of low yield strength steel LY225 under different stress states

Huang, Xiaoguang; Yuan, Yilin; Zhao, Jun; Li, Ruiqun

doi:10.1016/j.conbuildmat.2022.128907

Cited by 16 publications

(7 citation statements)

References 31 publications

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“…58 The size of the dimple including average diameter and depth. 59,60 The main factors affecting the size of the dimple are the size of the phase, density, plastic deformation capacity of the matrix, and deformation hardening index from the material side, and the stress magnitude and loading rate from the external conditions. The depth of the dimple and its apparent characteristics allow estimating the degree of local plastic deformation of the microstructure in the event of fracture.…”

Section: Dimple Fracturementioning

confidence: 99%

“…Dimple is the trace left on the fracture surface after the microscopic cavities generated by plastic deformation of the material in the micro‐zone range, after nucleation, growth, aggregation and finally interconnection leading to fracture 58 . The size of the dimple including average diameter and depth 59,60 . The main factors affecting the size of the dimple are the size of the phase, density, plastic deformation capacity of the matrix, and deformation hardening index from the material side, and the stress magnitude and loading rate from the external conditions.…”

Section: Performance Requirements Of Glass‐ceramicsmentioning

confidence: 99%

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Recent advances in glass‐ceramics: Performance and toughening mechanisms in restorative dentistry

Liu,

Yao,

Zhang

et al. 2023

J Biomed Mater Res

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The use of glass‐ceramics in the medical field has grown significantly since the 1980s. With excellent aesthetic properties, semi‐translucency, outstanding mechanical properties, corrosion resistance, wear resistance and great biocompatibility and workability glass‐ceramics is one of the most commonly used materials in restorative dentistry and is widely used in veneers, inlays, onlays, all‐ceramic crowns, and implant abutments. This review provides an overview of the research progress of glass‐ceramics in restorative dentistry, focusing on the classification, performance requirements, toughening mechanisms and their association with clinical performance, as well as the manufacturing and fabrication of glass‐ceramics in restorative dentistry. Finally, the developments and prospects of glass‐ceramics in restorative dentistry are summarized and discussed.

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Section: Dimple Fracturementioning

confidence: 99%

Section: Performance Requirements Of Glass‐ceramicsmentioning

confidence: 99%

Recent advances in glass‐ceramics: Performance and toughening mechanisms in restorative dentistry

Liu,

Yao,

Zhang

et al. 2023

J Biomed Mater Res

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“…where ∆ε, ∆ε e , ∆ε p , E, ∆σ, K , and n are the total strain range, total elastic strain range, total plastic strain range, Young's modulus, cyclic-hardening coefficient, and cyclic-hardening exponent, respectively. The cyclic stress-strain curve can be obtained by connecting the peaks of the stable hysteresis loops under various Δε/2; it is applied to represent the stable stress-strain relationship of the material under cyclic load, and it is usually described by a Ramberg-Osgood equation (Equation ( 2)) [16,33,36,37]. The typical total stress amplitude (Δσ/2) of the WJs under various Δε/2 at the cyclic stable stage is shown in Table 6, and the Young's modulus (E) is shown in Table 3.…”

Section: Hysteresis Loopsmentioning

confidence: 99%

Effects of V-N Microalloying on Low-Cycle Fatigue Property in the Welded Joints of Constructional Steel

Cui,

Yang,

et al. 2023

Materials

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Low-cycle fatigue testing was carried out for the welded joints of constructional steels containing 0% V + 0.0021% N and 0.10% V + 0.0078% N, and the effects of V-N microalloying on the low-cycle fatigue property of the welded joints were investigated. The results showed that when the total strain amplitudes were 1.2%, 1.4% and 1.6%, the mean low-cycle fatigue lives of the welded joints of steel containing 0.10% V + 0.0078% N were 5050, 2372 and 1535 cycles, respectively, which were significantly higher than those of the welded joints of steel containing 0% V + 0.0021% N; however, when the total strain amplitudes increased to 1.8% and 2.0%, the mean low-cycle fatigue lives of the welded joints of steel containing 0.10% V + 0.0078% N were 575 and 367 cycles, respectively, which were gradually lower than those of the welded joints of steel containing 0% V + 0.0021% N. The reasons causing the difference of low-cycle fatigue life were explained by the dislocation structure and precipitates in the welding heat-affected zone, plastic strain energy density of the welded joints, and fatigue fracture morphology. When the low-cycle fatigue life is between 100 and 200 cycles, the cyclic toughness of the welded joint of steel containing 0.10% V + 0.0078% N is between 57.48 and 78.22 J/cm3, which is higher than that of the welded joint of steel containing 0% V + 0.0021% N, indicating that the welded joint of steel containing 0.10% V + 0.0078% N is able to absorb more energy in a seismic condition, therefore possessing better seismic resistance.

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“…However, with the exploitation of oil and gas expanding into seismic and permafrost regions, pipelines are more vulnerable to cyclic loads with a large strain amplitude [15][16][17]. Under such conditions, pipes may undergo large plastic deformation and fail in extremely Metals 2023, 13, 1238 2 of 16 low cycles (N f < 100), which is also called extremely low cycle fatigue (ELCF) [18][19][20][21]. The fracture behavior of the ELCF shows significant difference to that of general LCF.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, compared with the generation and expansion of micro-cracks under fatigue load, the fracture mechanism of the ELCF is more similar to the ductile fracture mechanism under monotonic load [22,23]. On the fracture surface of the ELCF, the nucleation and growth of void can be clearly observed [18]. Therefore, the ELCF life usually deviates from the Coffin-Manson law, which is widely used to predict LCF life [15].…”

Section: Introductionmentioning

confidence: 99%

The Simulation of Extremely Low Cycle Fatigue Fracture Behavior for Pipeline Steel (X70) Based on Continuum Damage Model

Fang

Sun

et al. 2023

Metals

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Natural gas transmission pipelines installed in seismic and permafrost regions are vulnerable to cyclic loads with a large strain amplitude. Under these conditions, the pipe may fail in extremely low cycles, a situation which is also known as extremely low cycle fatigue (ELCF) failure. The fracture mechanism of ELCF shows significant difference to that of low cycle fatigue, and the ELCF life usually deviates from the Coffin–Manson law. Thus, it is essential to develop an effective model to predict ELCF failure of the pipeline. In this study, a series of ELCF tests is performed on pipeline steel (X70). A damage coupled mixed hardening model is developed to simulate the fracture behaviors. Continuum damage law under monotonic load is extended to cyclic load by introducing the effective equivalent plastic strain. By assuming the cyclic softening is induced by the damage accumulation, the damage parameters are fitted directly from the peak stress in each cycle. Then, the model is input into commercial software ABAQUS with a user material subroutine to simulate the fracture behaviors of these specimens. The simulation results show good agreements with the test results both under cyclic and monotonic load, which verifies the reliability of the model.

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Investigation of extremely low cycle fatigue behavior of low yield strength steel LY225 under different stress states

Cited by 16 publications

References 31 publications

Recent advances in glass‐ceramics: Performance and toughening mechanisms in restorative dentistry

Recent advances in glass‐ceramics: Performance and toughening mechanisms in restorative dentistry

Effects of V-N Microalloying on Low-Cycle Fatigue Property in the Welded Joints of Constructional Steel

The Simulation of Extremely Low Cycle Fatigue Fracture Behavior for Pipeline Steel (X70) Based on Continuum Damage Model

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